Author: "L. Gregorini" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"L. Gregorini"' showing total 208 results

Start Over Author "L. Gregorini"

208 results on '"L. Gregorini"'

1. The VVDS-VLA Deep Field II. Optical and near infrared identifications of VLA S(1.4GHz)>80 microJy sources in the VIMOS VLT Deep Survey VVDS-02h field

Author: Ciliegi, P., Zamorani, G., Bondi, M., Pozzetti, L., Bolzonella, M., Garilli, L. Gregorini B., Iovino, A., McCracken, H. J., Mellier, Y., Radovich, M., de Ruiter, H. R., Parma, P., Bottini, D., Brun, V. Le, Fevre, O. Le, Maccagni, D., Picat, J. P., Scaramella, R., Scodeggio, M., Tresse, L., Vettolani, G., Zanichelli, A., Adami, C., Arnaboldi, M., Arnouts, S., Bardelli, S., Cappi, A., Charlot, S., Contini, T., Foucaud, S., Franzetti, P., Guzzo, L., Ilbert, O., Marano, B., Marinoni, C., Mathez, G., Mazure, A., Meneux, B., Merighi, R., Merluzzi, P., Paltani, S., Pollo, A., Zucca, E., Bongiorno, A., Busarello, G., Gavignaud, I., Pello, R., Ripepi, V., and Rizzo, D.
Subjects: Astrophysics
Abstract: In this paper we present the optical and near-infrared identifications of the 1054 radio sources detected in the 20cm deep radio survey down to a 5sigma flux limit of about 80 microJy obtained with the VLA in the VIMOS VLT Deep Survey VVDS-02h deep field. Using U,B,V,R,I and K data, we identified 718 radio sources (~74% of the whole sample). The photometric redshift analysis shows that, in each magnitude bin, the radio sample has a higher median photometric redshift than the whole optical sample, while the median (V-I) color of the radio sources is redder than the median color of the whole optical sample. These results suggest that radio detection is preferentially selecting galaxies with higher intrinsic optical luminosity. From the analysis of the optical properties of the radio sources as function of the radio flux, we found that while about 35% of the radio sources are optically unidentified in the higher radio flux bin (S> 1.0 mJy), the percentage of unidentified sources decreases to about 25% in the faintest bins (S< 0.5 mJy). The median I magnitude for the total sample of radio sources,i.e. including also the unidentified ones, is brighter in the faintest radio bins than in the bin with higher radio flux. This suggests that most of the faintest radio sources are likely to be associated to relatively lower radio luminosity objects at relatively modest redshift, rather than radio-powerful, AGN type objects at high redshift., Comment: 15 pages, 11 figs. A&A in press
Published: 2005
Full Text: View/download PDF

2. Multifrequency polarimetry of a complete sample of PACO radio sources

Author: L. Toffolatti, Laura Bonavera, Viviana Casasola, A. Mignano, G. de Zotti, Tiziana Trombetti, Valentina Galluzzi, L. Gregorini, Anna Bonaldi, Marcella Massardi, Ron Ekers, Rosita Paladino, Roberto Ricci, M. López-Caniego, S. di Serego Alighieri, Elisabetta Liuzzo, M. Tucci, Jamie Stevens, Carlo Burigana, Galluzzi, V., Massardi, M., Bonaldi, A., Casasola, V., Gregorini, L., Trombetti, T., Burigana, C., De Zotti, G., Ricci, R., Stevens, J., Ekers, R. D., Bonavera, L., di Serego Alighieri, S., Liuzzo, E., LÃ³pez-Caniego, M., Mignano, A., Paladino, R., Toffolatti, L., and Tucci, M.
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Active galactic nucleus, Cosmic microwave background, Polarimetry, FOS: Physical sciences, Astrophysics, Radio continuum: galaxie, 01 natural sciences, Power law, Spectral line, law.invention, Telescope, law, 0103 physical sciences, 010303 astronomy & astrophysics, Physics, Galaxies: statistic, 010308 nuclear & particles physics, Astronomy and Astrophysics, Galaxies: active, Astronomy and Astrophysic, Polarization (waves), Astrophysics - Astrophysics of Galaxies, Intensity (physics), Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present high sensitivity polarimetric observations in 6 bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array (ATCA), achieved a 91% detection rate (at 5 sigma). Within this frequency range the spectra of about 95% of sources are well fitted by double power laws, both in total intensity and in polarisation, but the spectral shapes are generally different in the two cases. Most sources were classified as either steep- or peaked-spectrum but less than 50% have the same classification in total and in polarised intensity. No significant trends of the polarisation degree with flux density or with frequency were found. The mean variability index in total intensity of steep-spectrum sources increases with frequency for a 4-5 year lag, while no significant trend shows up for the other sources and for the 8 year lag. In polarisation, the variability index, that could be computed only for the 8 year lag, is substantially higher than in total intensity and has no significant frequency dependence., Comment: 15 pages, 7 figures, accepted for publication in MNRAS
Published: 2016
Full Text: View/download PDF

3. ALMA Band 3 polarimetric follow-up of a complete sample of faint PACO sources

Author: S. Burkutean, S. di Serego Alighieri, Matteo Bonato, Ron Ekers, Rosita Paladino, M. Tucci, L. Toffolatti, Elisabetta Liuzzo, L. Gregorini, Carlo Burigana, G. de Zotti, V. Galluzzi, Tiziana Trombetti, Laura Bonavera, Viviana Casasola, Giuseppe Puglisi, Roberto Ricci, M. López-Caniego, Marcella Massardi, and Anna Bonaldi
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Murchison Widefield Array, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Spectral line, law.invention, Telescope, law, 0103 physical sciences, Source counts, 010303 astronomy & astrophysics, galaxies: statistics, Astrophysics::Galaxy Astrophysics, radio continuum: galaxies, Physics, Settore FIS/05, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Polarization (waves), Astrophysics - Astrophysics of Galaxies, Galaxy, Wavelength, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Millimeter, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present Atacama Large Millimeter/submillimiter Array (ALMA) high sensitivity ($\sigma_P \simeq 0.4\,$mJy) polarimetric observations at $97.5\,$GHz (Band 3) of a complete sample of $32$ extragalactic radio sources drawn from the faint Planck-ATCA Co-eval Observations (PACO) sample ($b, Comment: 18 pages, 11 figures, accepted for publication in MNRAS
Published: 2019
Full Text: View/download PDF

4. Multifrequency JVLA observations of the X-shaped radio galaxy in Abell 3670

Author: Luca Bruno, L. Gregorini, Myriam Gitti, Alessandra Zanichelli, Bruno L., Gitti M., Zanichelli A., Gregorini L., and ITA
Subjects: Physics, Spectral index, 010308 nuclear & particles physics, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Galaxies: evolution, Astronomy and Astrophysics, Context (language use), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxies: active, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Galaxy, Radio continuum: galaxies, Jansky, X-shaped radio galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Radiative transfer, Brightest cluster galaxy, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: Context. X-shaped radio galaxies (XRGs) exhibit a pair of bright primary lobes and a pair of weak secondary lobes (wings), which are oriented with an angle that gives the structure a cross-like shape. Though several theoretical models have been proposed to explain their origin, there is currently not a general consensus on a formation scenario. Aims. We analysed new multifrequency Karl G. Jansky Very Large Array (JVLA) radio data at 1.5, 5.5, 6, and 9 GHz of the candidate XRG in Abell 3670 (A3670) in order to characterise and classify it for the first time and to investigate its origin. Methods. We produced flux, spectral index, and radiative age maps of A3670 by means of the new radio data. We investigated the connection between the radio galaxy and its host, a brightest cluster galaxy (BCG) with two optical nuclei classified as a dumbbell galaxy. Finally we discussed the literature models and compared them to the observed properties of A3670. Results. We classify A3670 as a Fanaroff-Riley I-type XRG and measured a 1.4 GHz radio power of 1.7 x 10^25 W Hz-1. By estimating the radiative age of the various source components, we find that the wings are 20 Myr older than the lobes. We verified that the lobes and wings are aligned with the major and minor axes of the optical galaxy, respectively, and we estimated a black hole mass of 10^9 Msun , which is in agreement with the typical properties of the XRGs. Conclusions. Among the discussed scenarios, the jet-shell interaction model may best reproduce the observed properties of A3670. The gas of a stellar shell is responsible for the deflection of the jets, thus forming the wings. The presence of stellar shells in A3670 is plausible, but it needs further optical observations to be confirmed., Comment: 11 pages, 19 figures grouped in 8, in press on Astronomy&Astrophysics
Published: 2019

5. Characterization of polarimetric and total intensity behaviour of a complete sample of PACO radio sources in the radio bands

Author: M. López-Caniego, Joseph R. Callingham, Anna Bonaldi, G. de Zotti, Jamie Stevens, L. Gregorini, L. Toffolatti, Vincenzo Galluzzi, Matteo Bonato, Laura Bonavera, S. di Serego Alighieri, Viviana Casasola, Carlo Burigana, Roberto Ricci, Ron Ekers, Tiziana Trombetti, Rosita Paladino, Marcella Massardi, M. Tucci, Elisabetta Liuzzo, Vincenzo, Galluzzi, Marcella, Massardi, Anna, Bonaldi, Viviana, Casasola, Loretta, Gregorini, Tiziana, Trombetti, Carlo, Burigana, Matteo, Bonato, Gianfranco De Zotti, Roberto, Ricci, Jamie, Steven, Ronald David Ekers, Laura, Bonavera, Sperello di Serego Alighieri, Elisabetta, Liuzzo, Marcos, Lopez-Caniego, Rosita, Paladino, Luigi, Toffolatti, Marco, Tucci, and Joseph Russell Callingham
Subjects: Physics, polarization, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, European research, galaxies: active, Library science, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, media_common.cataloged_instance, Commonwealth, Christian ministry, European union, radio continuum: galaxie, Partial support, 010303 astronomy & astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, media_common
Abstract: We present high sensitivity ($\sigma_P \simeq 0.6\,$mJy) polarimetric observations in seven bands, from $2.1$ to $38\,$GHz, of a complete sample of $104$ compact extragalactic radio sources brighter than $200\,$mJy at $20\,$GHz. Polarization measurements in six bands, in the range $5.5-38\,$GHz, for $53$ of these objects were reported by \citet{Galluzzi2017}. We have added new measurements in the same six bands for another 51 sources and measurements at $2.1\,$GHz for the full sample of $104$ sources. Also, the previous measurements at $18$, $24$, $33$ and $38\,$GHz were re-calibrated using the updated model for the flux density absolute calibrator, PKS1934-638, not available for the earlier analysis. The observations, carried out with the Australia Telescope Compact Array (ATCA), achieved a $90\%$ detection rate (at $5\sigma$) in polarization. $89$ of our sources have a counterpart in the $72$ to $231\,$MHz GLEAM survey \citep{HurleyWalker2017}, providing an unparalleled spectral coverage of $2.7$ decades of frequency for these sources. While the total intensity data from $5.5$ to $38\,$GHz could be interpreted in terms of single component emission, a joint analysis of more extended total intensity spectra presented here, and of the polarization spectra, reveals that over $90\%$ of our sources show clear indications of at least two emission components. We interpret this as an evidence of recurrent activity. Our high sensitivity polarimetry has allowed a $5\,\sigma$ detection of the weak circular polarization for $\sim 38\%$ of the dataset, and a deeper estimate of $20\,$GHz polarization source counts than has been possible so far., Comment: 18 pages, 7 figures, accepted in MNRAS
Published: 2018

6. Observations of the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope

Author: F. de Gasperin, Gabriele Giovannini, Andrea Melis, G. Valente, Torsten A. Enßlin, Fabio Gastaldello, Matteo Murgia, Raimondo Concu, F. Loi, Walter Boschin, Chiara Ferrari, Sergio Poppi, L. Gregorini, H. Junklewitz, P. Parma, Luigina Feretti, Emanuela Orrú, Melanie Johnston-Hollitt, Federica Govoni, Ettore Carretti, S. Colafrancesco, Rosita Paladino, Franco Vazza, G. B. Taylor, Tracy E. Clarke, V. Vacca, Richard A. Perley, Marisa Girardi, Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE ( LAGRANGE ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Loi, F., Murgia, M., Govoni, F., Vacca, V., Feretti, L., Giovannini, g., Carretti, E., Gastaldello, F., Girardi, M., Vazza, F., Concu, R., Melis, A., Paladino, R., Poppi, S., Valente, G., Boschin, W., Clarke, T. E., Colafrancesco, S., Enßlin, T., Ferrari, C., de Gasperin, F., Gregorini, L., Johnston-Hollitt, M., Junklewitz, H., Orrù, E., Parma, P., Perley, R., Taylor, G. B., Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), galaxies: clusters: intracluster medium, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], FOS: Physical sciences, magnetic field, Astrophysics, magnetic fields, 01 natural sciences, Power law, Radio spectrum, Radio telescope, symbols.namesake, 0103 physical sciences, Faraday effect, 010303 astronomy & astrophysics, acceleration of particle, acceleration of particles, Physics, Spectral index, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Magnetic field, Radio halo, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), symbols, clusters: intracluster medium. [galaxies], magnetic fields – galaxies: clusters: intracluster medium, galaxies: clusters: intracluster medium – magnetic fields – acceleration of parti- cles, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We observed the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope to provide new constraints on its spectral properties at high frequency. We conducted observations in three frequency bands centred at 1.4 GHz, 6.6 GHz and 19 GHz, resulting in beam resolutions of 14$^{\prime}$, 2.9$^{\prime}$ and 1$^{\prime}$ respectively. These single-dish data were also combined with archival interferometric observations at 1.4 and 1.7 GHz. From the combined images, we measured a flux density of ${\rm S_{1.4GHz}=(158.3\pm9.6)\,mJy}$ for the central radio halo and ${\rm S_{1.4GHz}=(126\pm8)\,mJy}$ and ${\rm S_{1.4GHz}=(11.7\pm0.7)\,mJy}$ for the northern and the southern relic respectively. After the spectral modelling of the discrete sources, we measured at 6.6 GHz ${\rm S_{6.6GHz}=(17.1\pm1.2)\,mJy}$ and ${\rm S_{6.6GHz}=(0.6\pm0.3)\,mJy}$ for the northern and southern relic respectively. Assuming simple diffusive shock acceleration, we interpret measurements of the northern relic with a continuous injection model represented by a broken power-law. This yields an injection spectral index ${\rm \alpha_{inj}=0.7\pm0.1}$ and a Mach number ${\rm M=3.3\pm0.9}$, consistent with recent X-ray estimates. Unlike other studies of the same object, no significant steepening of the relic radio emission is seen in data up to 8.35 GHz. By fitting the southern relic spectrum with a simple power-law (${\rm S_{\nu}\propto\nu^{-\alpha}}$) we obtained a spectral index ${\rm \alpha\approx1.9}$ corresponding to a Mach number (${\rm M\approx1.8}$) in agreement with X-ray estimates. Finally, we evaluated the rotation measure of the northern relic at 6.6 GHz. These results provide new insights on the magnetic structure of the relic, but further observations are needed to clarify the nature of the observed Faraday rotation., Comment: 20 pages, 11 figures. Accepted by MNRAS
Published: 2017
Full Text: View/download PDF

7. Sardinia Radio Telescope observations of Abell 194. The intra-cluster magnetic field power spectrum

Author: Franco Vazza, Matteo Murgia, Gianni Bernardi, F. de Gasperin, Melanie Johnston-Hollitt, Raimondo Concu, Federica Govoni, M. Rossetti, Torsten A. Ensslin, Luigina Feretti, Tracy E. Clarke, Richard A. Perley, Rosita Paladino, Chiara Ferrari, M. Brienza, Marisa Girardi, G. B. Taylor, G. Giovannini, F. Gastaldello, H. Junklewitz, V. Vacca, W. Boschin, L. Gregorini, P. Parma, Sergio Poppi, Ettore Carretti, Emanuela Orrú, G. Valente, Annalisa Bonafede, S. Colafrancesco, Dominique Eckert, F. Loi, Andrea Melis, Astronomy, Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Govoni, F., Murgia, M., Vacca, V., Loi, F., Girardi, M., Gastaldello, F., Giovannini, G., Feretti, L., Paladino, R., Carretti, E., Concu, R., Melis, A., Poppi, S., Valente, G., Bernardi, G., Bonafede, A., Boschin, W., Brienza, M., Clarke, T. E., Colafrancesco, S., De Gasperin, F., Eckert, D., Enã lin, T. A., Ferrari, C., Gregorini, L., Johnston-Hollitt, M., Junklewitz, H., Orrã¹, E., Parma, P., Perley, R., Rossetti, M., B Taylor, G., Vazza, F., Joseph Louis LAGRANGE ( LAGRANGE ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Enßlin, T. A., and Orrù, E.
Subjects: VELOCITY DISPERSIONS, Electron density, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, Radio galaxy, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], FOS: Physical sciences, REPRESENTATIVE SAMPLE, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, clusters: general [Galaxies], magnetic fields, 01 natural sciences, Power law, Radio telescope, 0103 physical sciences, FARADAY-ROTATION MAPS, 010303 astronomy & astrophysics, Galaxy cluster, Astrophysics::Galaxy Astrophysics, galaxies: clusters: individual: Abell 194, VLA OBSERVATIONS, Physics, 010308 nuclear & particles physics, SCALE-INDEPENDENT METHOD, Spectral density, RICH CLUSTERS, Astronomy and Astrophysics, Astronomy and Astrophysic, Polarization (waves), Astrophysics - Astrophysics of Galaxies, clusters: individual: Abell 194 [Galaxies], Magnetic field, Space and Planetary Science, galaxies: clusters: general, Astrophysics of Galaxies (astro-ph.GA), ALL-SKY SURVEY, X-RAY, large-scale structure of Universe, HYDRA-A CLUSTER, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], GALAXY CLUSTERS, Galaxies: clusters: general, Galaxies: clusters: individual: Abell 194, Magnetic fields, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. We analyze new total intensity and polarization observations of Abell 194 obtained with the Sardinia Radio Telescope (SRT). We use the SRT data in combination with archival Very Large Array observations to derive both the spectral aging and Rotation Measure (RM) images of the radio galaxies 3C40A and 3C40B embedded in Abell 194. The optical analysis indicates that Abell 194 does not show a major and recent cluster merger, but rather agrees with a scenario of accretion of small groups. Under the minimum energy assumption, the lifetimes of synchrotron electrons in 3C40B measured from the spectral break are found to be 157 Myrs. The break frequency image and the electron density profile inferred from the X-ray emission are used in combination with the RM data to constrain the intra-cluster magnetic field power spectrum. By assuming a Kolmogorov power law power spectrum, we find that the RM data in Abell 194 are well described by a magnetic field with a maximum scale of fluctuations of Lambda_max=64 kpc and a central magnetic field strength of =1.5 microG. Further out, the field decreases with the radius following the gas density to the power of eta=1.1. Comparing Abell 194 with a small sample of galaxy clusters, there is a hint of a trend between central electron densities and magnetic field strengths., Comment: Accepted by Astronomy and Astrophysics, 29 pages, 15 figures. Abstract abridged. A pdf version with high-quality figures can be downloaded from http://erg.oa-cagliari.inaf.it/preprints/a194_paper.pdf
Published: 2017
Full Text: View/download PDF

8. A 20 GHz bright sample for > 72 - II. Multifrequency follow-up

Author: F. Mantovani, Marcin P. Gawronski, Isabella Prandoni, Simona Righini, L. Gregorini, Roberto Ricci, Ettore Carretti, Pietro Procopio, A. Zanichelli, Michael W. Peel, Karl-Heinz Mack, R. Verma, Marcella Massardi, Ricci R., Righini S., Verma R., Prandoni I., Carretti E., Mack K.-H., Massardi M., Procopio P., Zanichelli A., Gregorini L., Mantovani F., Gawroński M. P., and Peel M. W.
Subjects: Physics, QSOS, Radio galaxy, RADIO CONTINUUM: GENERAL, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, Spectral properties, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Sample (graphics), Redshift, Spectral line, Radio telescope, Space and Planetary Science, RADIO CONTINUUM: GALAXIES, Polar cap, Astrophysics::Galaxy Astrophysics
Abstract: We present follow-up observations at 5, 8 and 30 GHz of the K-band Northern Wide Survey (KNoWS) 20 GHz Bright Sample, performed with the 32-m Medicina radio telescope and the 32-m Toruń radio telescope. The KNoWS sources were selected in the Northern Polar Cap (δ > 72°) and have a flux density limit S20 GHz = 115 mJy. We include NRAO-VLA Sky Survey 1.4 GHz measurements to derive the source radio spectra between 1.4 and 30 GHz. Based on optical identifications, 68 per cent of the sources are quasars and 27 per cent are radio galaxies. A redshift measurement is available for 58 per cent of the sources. The radio spectral properties of the different source populations are found to be in agreement with those of other high-frequency-selected samples.
Published: 2013
Full Text: View/download PDF

9. Sardinia Radio Telescope observations of Abell 194

Author: F. Govoni, M. Murgia, V. Vacca, F. Loi, M. Girardi, F. Gastaldello, G. Giovannini, L. Feretti, R. Paladino, E. Carretti, R. Concu, A. Melis, S. Poppi, G. Valente, G. Bernardi, A. Bonafede, W. Boschin, M. Brienza, T. E. Clarke, S. Colafrancesco, F. de Gasperin, D. Eckert, T. A. Enßlin, C. Ferrari, L. Gregorini, M. Johnston-Hollitt, H. Junklewitz, E. Orrù, P. Parma, R. Perley, M. Rossetti, G. B Ta
Published: 2017
Full Text: View/download PDF

10. A 20 GHz bright sample for δ > +72° - I. Catalogue

Author: M. López-Caniego, Simona Righini, Isabella Prandoni, Pietro Procopio, A. Zanichelli, F. Mantovani, Marcella Massardi, Ettore Carretti, Karl-Heinz Mack, R. Verma, L. Gregorini, and Roberto Ricci
Subjects: Physics, Pilot survey, Northern Hemisphere, Flux, Astronomy and Astrophysics, Sample (graphics), law.invention, Telescope, Radio telescope, Space and Planetary Science, law, Source counts, Remote sensing, Data reduction
Abstract: During 2010–11, the Medicina 32-m dish hosted the seven-feed 18–26.5 GHz receiver built for the Sardinia Radio Telescope, with the goal to perform its commissioning. This opportunity was exploited to carry out a pilot survey at 20 GHz over the area for δ> +72. ◦ 3. This paper describes all the phases of the observations, as they were performed using new hardware and software facilities. The map-making and source extraction procedures are illustrated. A customized data reduction tool was used during the follow-up phase, which produced a list of 73 confirmed sources down to a flux density of 115 mJy. The resulting catalogue, presented here, is complete above 200 mJy. Source counts are in agreement with those provided by the Australia Telescope 20 GHz (AT20G) survey. This pilot activity paves the way for a larger project, the K-band Northern Wide Survey (KNoWS), whose final aim is to survey the whole Northern hemisphere down to a flux limit of 50 mJy (5σ ).
Published: 2012
Full Text: View/download PDF

11. Ordered magnetic fields around radio galaxies: evidence for interaction with the environment

Author: R. A. Laing, P. Parma, Alan H. Bridle, L. Gregorini, and D. Guidetti
Subjects: Physics, Radio galaxy, Field line, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Field strength, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Rotation, Magnetic field, symbols.namesake, Space and Planetary Science, Orientation (geometry), Faraday effect, symbols, Surface brightness
Abstract: We present detailed imaging of Faraday rotation and depolarization for the radio galaxies 0206+35, 3C 270, 3C 353 and M 84, based on Very Large Array observations at multiple frequencies in the range 1365 to 8440 MHz. This work suggests a more complex picture of the magneto-ionic environments of radio galaxies than was apparent from earlier work. All of the sources show spectacular banded rotation measure (RM) structures with contours of constant RM perpendicular to the major axes of their radio lobes. We give a comprehensive description of the banded RM phenomenon and present an initial attempt to interpret it as a consequence of interactions between the sources and their surroundings. We show that the material responsible for the Faraday rotation is in front of the radio emission and that the bands are likely to be caused by magnetized plasma which has been compressed by the expanding radio lobes. A two-dimensional magnetic structure in which the field lines are a family of ellipses draped around the leading edge of the lobe can produce RM bands in the correct orientation for any source orientation. We also report the first detections of rims of high depolarization at the edges of the inner radio lobes of M 84 and 3C 270. These are spatially coincident with shells of enhanced X-ray surface brightness, in which both the field strength and the thermal gas density are likely to be increased by compression.
Published: 2011
Full Text: View/download PDF

12. The VIMOS VLT Deep Survey

Author: O. Le Fèvre, G. Vettolani, S. Paltani, L. Tresse, G. Zamorani, V. Le Brun, C. Moreau, D. Bottini, D. Maccagni, J. P. Picat, R. Scaramella, M. Scodeggio, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, A. Cappi, S. Charlot, T. Contini, S. Foucaud, P. Franzetti, B. Garilli, I. Gavignaud, L. Guzzo, O. Ilbert, A. Iovino, H. J. McCracken, D. Mancini, B. Marano, C. Marinoni, G. Mathez, A. Mazure, B. Meneux, R. Merighi, R. Pellò, A. Pollo, L. Pozzetti, M. Radovich, E. Zucca, M. Arnaboldi, M. Bondi, A. Bongiorno, G. Busarello, P. Ciliegi, L. Gregorini, Y. Mellier, P. Merluzzi, V. Ripepi, and D. Rizzo
Subjects: QSOS, Physics, Very Large Telescope, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Advanced Camera for Surveys, Redshift, Galaxy, Stars, Space and Planetary Science, 0103 physical sciences, Magnitude (astronomy), Chandra Deep Field South, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: {This paper presents the VIMOS VLT Deep Survey around the Chandra Deep Field South (CDFS). We have measured 1599 new redshifts with VIMOS on the European Observatory Very Large Telescope - UT3, in an area 21x21.6 arcmin^2, including 784 redshifts in the Hubble Space Telescope - Advanced Camera for Surveys GOODS area. 30% of all objects with I_AB=24 have been observed independently of magnitude, indicating that the sample is purely magnitude limited. We have reached an unprecedented completeness level of 88% in terms of the ratio of secure measurements vs. observed objects, while 95% of all objects have a redshift measurement. A total of 1452 galaxies, 139 stars, 8 QSOs have a redshift identification, 141 of these being unsecure measurements. The redshift distribution down to I_AB=24 is peaked at a median redshift z=0.73, with a significant high redshift tail extending up to ~4. Several high density peaks in the distribution of galaxies are identified. In particular, the strong peak at z=0.735 contains more than 130 galaxies in a velocity range +/-2000 km/s distributed all across the transverse ~20 h^-1 Mpc of the survey. We are releasing all redshifts to the community, along with the cross identification with HST-ACS GOODS sources on the CENCOS database environment this http URL
Published: 2004
Full Text: View/download PDF

13. Multi-frequency study of the B3-VLA sample

Author: L. Gregorini, M. Vigotti, Uli Klein, and K.-H. Mack
Subjects: Physics, Series (mathematics), Drop (liquid), Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Rotation, law.invention, Wavelength, symbols.namesake, Space and Planetary Science, law, Dispersion (optics), Faraday effect, symbols, Faraday cage, Constant (mathematics), Astrophysics::Galaxy Astrophysics
Abstract: This paper is the third of a series, and presents the results of the linear polarisation of the B3-VLA sample, at 1.4, 2.7, 4.8 and 10.5 GHz. We find that flat-spectrum sources are significantly less polarised than the steep ones at 10.5 GHz. A trend is seen for sources with larger linear size to be more strongly polarised. Compact steep-spectrum sources (CSSs) exhibit much stronger depolarisation than non-CSSs. Flat-spectrum sources are characterized by almost constant, and low, degrees of polarisation over the whole wavelength range studied here. We add 143 new Rotation Measures to the available database published by Wielebinski & Krause (1993). An important result is that the decrease of the degree of polarisation is almost linear with wavelength and does not drop to zero at lower frequencies. This behaviour cannot be fitted by any existing model of external depolarisation or intrinsic Faraday dispersion. We consider an intrinsic process producing the observed depolarisation, involving three source components with different emissivities and Faraday depths, while the Faraday rotation must arise from a foreground screen, most likely Galactic in origin.
Published: 2003
Full Text: View/download PDF

14. Structure of the magneto-ionic media around the FR Class I radio galaxy 3C 449

Author: D. Guidetti, R. A. Laing, M. Murgia, F. Govoni, P. Parma, L. Gregorini, L. Feretti, A. Comastri, L. Angelini, M. Cappi, COMASTRI A., ANGELINI L., CAPPI M., D. Guidetti, R. A. Laing, M. Murgia, F. Govoni, P. Parma, L. Gregorini, and L. Feretti
Subjects: Physics, Radio galaxy, Astronomy, Type-cD galaxy, Astrophysics, Galaxy merger, Disc galaxy, Galaxy, GALAXIES, MAGNETIC FIELD EFFECTS, X-shaped radio galaxy, Interacting galaxy, BRIGHTNESS, Lenticular galaxy, INTERSTELLAR MATTER
Abstract: The goal of this work is to constrain the strength and structure of the magnetic field associated with the environment of the radio source 3C 449 by using observations of Faraday rotation, which we model with a structure function technique, and by comparison with numerical simulations. We present detailed rotation measure images for the polarized radio source 3C 449. All of the observations are consistent with pure foreground Faraday rotation. We also use depolarization measurements to estimate the minimum scale of the field variations. We then develop three-dimensional models with a gas density distribution derived from X-ray observations and a random magnetic field with this power spectrum. The rotation measure and depolarization data are consistent with a broken power-law magnetic-field power spectrum, with a break at about 11 kpc and slopes of 2.98 and 2.07 at smaller and larger scales respectively. The maximum and minimum scales of the fluctuations are ≈65 and ≈0.2 kpc, respectively. The average magnetic field strength at the cluster centre is 3.5 ± 1.2 μG, decreasing linearly with the gas density within ≈16 kpc of the nucleus. At larger distances, the dependence of field on density appears to flatten, but this may be an effect of errors in the density model. The magnetic field is not energetically important.
Published: 2010
Full Text: View/download PDF

15. The B3–VLA CSS sample

Author: M. Vigotti, R. Fanti, C. Fanti, S. Tinti, L. Gregorini, Daniele Dallacasa, and Carlo Stanghellini
Subjects: Physics, Brightness, Symmetric structure, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Low frequency, Sample (graphics), Radio spectrum, Space and Planetary Science, Astrophysics::Galaxy Astrophysics
Abstract: VLBA observations at 18 cm are presented for 28 Compact Steep-spectrum radio Sources (CSSs) from the B3-VLA CSS sample. These sources were unresolved in previous VLA observations at high frequencies or their brightness distribution was dominated by an unresolved steep spectrum component. More than half of them also showed a low frequency turnover in their radio spectrum. The VLBA images display in most cases a compact symmetric structure. Only in a minority of cases complex morphologies are present., 11 pages, many low resolution figures, A&A accepted. A higher quality g-zipped postscript file can be found at http://www.ira.cnr.it/~ddallaca/h3442.ps.gz
Published: 2002
Full Text: View/download PDF

16. Multi-frequency VLA observations of a new sample of CSS/GPS radio sources

Author: R. Fanti, L. Gregorini, C. Stanghellini, Daniele Dallacasa, Francesca Pozzi, C. Fanti, and M. Vigotti
Subjects: Physics, business.industry, Astronomy, Astronomy and Astrophysics, Astrophysics, Polarization (waves), Power law, Redshift, Flattening, Spectral line, Space and Planetary Science, Global Positioning System, business, Four-frequency
Abstract: In this paper we present a new sample of 87 Compact Steep Spectrum radio sources (CSS) with flux density0.8 Jy at 0.4 GHz. This sample has been selected from the B3-VLA sample with the aid of new VLA observations at 4.9 and 8.5 GHz which allowed to clean an earlier selection based on VLA 1.5 GHz data. Redshifts, either spectroscopic or photometric, are known for 62% of the sources. About 75% of the sources are resolved or slightly resolved in the new observations. The range of measured linear sizes is from 20 h 1 kpc (selection upper limit) down to0.5 h 1 kpc, which corresponds to our resolution limit. The Largest Linear Size (LLS) distribution is well represented by the power law dN=d(LLS) / LLS 0:6 , consistent with earlier results. The majority of the radio sources smaller than 0.5 h 1 kpc shows a marked spectral flattening at low frequencies. The four frequency spectra computed in the range 0.4{8.5 GHz display a signicant steepening at high frequencies in the largest majority of cases. A considerable fraction of source components are polarized, with median values of their fractional polarization6% and4% at 8.5 and 4.9 GHz respectively.
Published: 2001
Full Text: View/download PDF

17. The ATESP 5 GHz radio survey. II. Physical properties of the faint radio population

Author: Isabella Prandoni, A. Mignano, Ron Ekers, L. Gregorini, H. R. de Ruiter, Gianpaolo Vettolani, Mark H. Wieringa, P. Parma, A. Mignano, I. Prandoni, L. Gregorini, P. Parma, H. R. de Ruiter, M. H. Wieringa, G. Vettolani, and R. D. Ekers
Subjects: Physics, CATALOGS, Spectral index, education.field_of_study, METHODS:DATA ANALYSIS, Active galactic nucleus, Radio galaxy, RADIO CONTINUUM: GENERAL, GALAXY: GENERAL, Astrophysics::High Energy Astrophysical Phenomena, Population, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Redshift, Galaxy, Space and Planetary Science, Source counts, education, SURVEYS, Astrophysics::Galaxy Astrophysics
Abstract: One of the most debated issues about sub-mJy radio sources, which are responsible for the steepening of the 1.4 GHz source counts, is the origin of their radio emission. Particularly interesting is the possibility of combining radio spectral index information with other observational properties to assess whether the sources are triggered by star formation or nuclear activity. The aim of this work is to study the optical and near infrared properties of a complete sample of 131 radio sources with S>0.4 mJy, observed at both 1.4 and 5 GHz as part of the ATESP radio survey. We use deep multi-colour (UBVRIJK) images, mostly taken in the framework of the ESO Deep Public Survey, to optically identify and derive photometric redshifts for the ATESP radio sources. Deep optical coverage and extensive colour information are available for 3/4 of the region covered by the radio sample. Typical depths of the images are U~25, B~26, V~25.4, R~25.5, I~24.3, 19.51000), typical of classical powerful radio galaxies and quasars. Flat-spectrum sources with low R values are preferentially identified with early type galaxies, where the radio emission is most probably triggered by low-luminosity active galactic nuclei. Considering both early type galaxies and quasars as sources with an active nucleus, such sources largely dominate our sample (78%). Flat-spectrum sources associated with early type galaxies are quite compact (d, Comment: 15 pages, 13 figures, accepted for pubblication in A&A
Published: 2007
Full Text: View/download PDF

18. Highlights from the VIMOS VLT Deep Survey

Author: O. . Fevre, B. Garilli, V. . Brun, D. Maccagni, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, D. Bottini, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, O. Ilbert, A. Iovino, F. Lamareille, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pello, A. Pollo, L. Pozzetti, M. Radovich, D. Vergani, G. Zamorani, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, S. . La, L. . Ravel, L. Gregorini, E. Perez Montero, Y. Mellier, P. Merluzzi, S. Temporin, C. J. Walcher, CUCCIATI, OLGA, O. . Fevre, B. Garilli, V. . Brun, D. Maccagni, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnout, S. Bardelli, M. Bolzonella, D. Bottini, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, O. Ilbert, A. Iovino, F. Lamareille, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pello, A. Pollo, L. Pozzetti, M. Radovich, D. Vergani, G. Zamorani, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, O. Cucciati, S. . La, L. . Ravel, L. Gregorini, E. Perez-Montero, Y. Mellier, P. Merluzzi, S. Temporin, and C. J. Walcher
Subjects: Galaxy group, cluster, Characteristics and properties of external galaxies and extragalactic objects, and superclusters, large scale structure of the Universe
Abstract: Taking advantage of the efficient VIMOS multi-slit spectrograph on the VLT, we are conducting the VIMOS VLT Deep Survey (VVDS), aimed to trace the evolution of galaxies and large-scale structures over more than 90% of the life of the Universe. The VVDS is made of three magnitude selected surveys: the wide survey at IAB = 22.5, the deep survey at IAB = 24, and the ultra-deep survey at IAB = 24.75. To date, the VVDS has assembled more than 45000 redshifts in the range 0 < z ≤ 5. A number of results have been obtained, including a comprehensive view of the luminosity and stellar mass evolution as a function of galaxy type over 0 < z ≤ 2, a detailed look at the evolution of the clustering of galaxies as a function of type and environment, and a complete census of the actively star-forming galaxy population for 1.5 < z ≤ 5. This paper focuses on current highlights and on-going work from the VVDS.
Published: 2007

19. The VIMOS VLT Deep Survey. The assembly history of the stellar mass in galaxies: from the young to the old universe

Author: O. Ilbert, R. Pello, E. Zucca, Sylvie Foucaud, Thierry Contini, F. Lamareille, C. Adami, I. Gavignaud, Paolo Ciliegi, Paola Merluzzi, P. Franzetti, A. Pollo, Roberto Scaramella, A. Mazure, S. Temporin, M. Radovich, Olga Cucciati, R. Merighi, Laurence Tresse, D. Maccagni, A. Zanichelli, Stéphane Arnouts, Bianca Garilli, V. Le Brun, Stéphane Paltani, A. Iovino, Angela Bongiorno, C. J. Walcher, S. Bardelli, J. P. Picat, Yannick Mellier, D. Bottini, B. Meneux, M. Scodeggio, A. Cappi, Micol Bolzonella, M. Bondi, Bruno Marano, Daniela Vergani, Luigi Guzzo, Christian Marinoni, Stephane Charlot, O. Le Fevre, Lucia Pozzetti, S. de la Torre, Jarle Brinchmann, G. Zamorani, Gianpaolo Vettolani, H. J. McCracken, L. Gregorini, INAF-Osservatorio Astronomico di Bologna (OABO), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Brera, Institute for Astronomy, University of Hawaii, Max-Planck-Institut für Astrophysik (MPA), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centro de Astrofisica da Universidade do Porto (CAUP), Istituto di Radioastronomia, Bologna, School of Physics and Astronomy, University of Nottingham, Astrophysikalisches Institut Potsdam (AIP), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Astronomia, Università di Bologna, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), INTEGRAL Science Data Centre, Astronomical Observatory, Jagiellonia University, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Dipartimento di Fisica, Università di Bologna, AUTRES, Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris - Site de Paris (OP), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Services communs OMP (UMS 831), Axe 1 : procédés céramiques, Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), Beaussier, Catherine, Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), École normale supérieure - Paris (ENS Paris), L. Pozzetti, M. Bolzonella, F. Lamareille, G. Zamorani, P. Franzetti, O. Le Fèvre, A. Iovino, S. Temporin, O. Ilbert, S. Arnout, S. Charlot, J. Brinchmann, E. Zucca, L. Tresse, M. Scodeggio, L. Guzzo, D. Bottini, B. Garilli, V. Le Brun, D. Maccagni, J. P. Picat, R. Scaramella, G. Vettolani, A. Zanichelli, C. Adami, S. Bardelli, A. Cappi, P. Ciliegi, T. Contini, S. Foucaud, I. Gavignaud, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pellò, A. Pollo, M. Radovich, M. Bondi, A. Bongiorno, O. Cucciati, S. de la Torre, L. Gregorini, Y. Mellier, P. Merluzzi, D. Vergani, and C. J. Walcher
Subjects: Stellar mass, Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], 01 natural sciences, Photometry (optics), [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, education.field_of_study, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Star formation, Astrophysics (astro-ph), Astronomy and Astrophysics, Galaxy, Redshift, Stars, Space and Planetary Science, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], VIMOS-VLT Deep Survey
Abstract: We present a detailed analysis of the Galaxy Stellar Mass Function of galaxies up to z=2.5 as obtained from the VVDS. We estimate the stellar mass from broad-band photometry using 2 different assumptions on the galaxy star formation history and show that the addition of secondary bursts to a continuous star formation history produces systematically higher (up to 40%) stellar masses. At low redshift (z=0.2) we find a substantial population of low-mass galaxies (10^8 Msun at z=1), and a mild mass-dependent average evolution (`mass-downsizing'). In particular our data are consistent with mild/negligible (6x10^10 Msun). For less massive systems the no-evolution scenario is excluded. A large fraction (>=50%) of massive galaxies have been already assembled and converted most of their gas into stars at z=1, ruling out the `dry mergers' as the major mechanism of their assembly history below z=1. This fraction decreases to 33% at z=2. Low-mass systems have decreased continuously in number and mass density (by a factor up to 4) from the present age to z=2, consistently with a prolonged mass assembly also at z, 20 pages with 12 encapsulated figures. Version accepted by A&A
Published: 2007

20. The VVDS type-1 AGN sample: the faint end of the luminosity function

Author: A. Bongiorno, G. Zamorani, I. Gavignaud, B. Marano, S. Paltani, G. Mathez, P. Møller, J. P. Picat, M. Cirasuolo, F. Lamareille, D. Bottini, B. Garilli, V. Le Brun, O. Le Fèvre, D. Maccagni, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, L. Guzzo, O. Ilbert, A. Iovino, H. J. McCracken, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, R. Pellò, A. Pollo, L. Pozzetti, M. Radovich, E. Zucca, E. Hatziminaoglou, M. Polletta, M. Bondi, J. Brinchmann, O. Cucciati, S. de la Torre, L. Gregorini, Y. Mellier, P. Merluzzi, S. Temporin, D. Vergani, C. J. Walcher, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), INAF-Osservatorio Astronomico di Bologna (OABO), Astrophysikalisches Institut Potsdam (AIP), INTEGRAL Science Data Centre, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), University of Edinburgh, Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), IRA-INAF, Bologna, Max-Planck-Institut für Astrophysik (MPA), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), School of Physics and Astronomy, University of Nottingham, INAF-Osservatorio Astronomico di Brera, Institute for Astronomy, University of Hawaii, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory, Jagiellonia University, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Center for Astrophysics and Space Sciences, University of California, San Diego, Centro de Astrofisica da Universidade do Porto (CAUP), AUTRES, Services communs OMP (UMS 831), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT), Observatoire de Paris - Site de Paris (OP), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), École normale supérieure - Paris (ENS Paris), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), A. Bongiorno, G. Zamorani, I. Gavignaud, B. Marano, S. Paltani, G. Mathez, J.P. Picat, M. Cirasuolo, F. Lamareille, D. Bottini, B. Garilli, V. Le Brun, O. Le Fevre, D. Maccagni, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnout, S. Bardelli, M. Bolzonella, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, L. Guzzo, O. Ilbert, A. Iovino, H.J. McCracken, C. Marinon, A. Mazure, B. Meneux, R. Merighi, R. Pello', A. Pollo, L. Pozzetti, M. Radovich, E. Zucca, E. Hatziminaoglou, M. Polletta, M. Bondi, J. Brinchmann, O. Cucciati, S. de la Torre, L. Gregorini, Y. Mellier, P. Merluzzi, S. Temporin, D. Vergani, and C.J. Walcher
Subjects: Physics, Active galactic nucleus, COSMIC cancer database, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, Redshift, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, 0103 physical sciences, Magnitude (astronomy), Range (statistics), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Luminosity function (astronomy)
Abstract: In a previous paper (Gavignaud et al. 2006), we presented the type-1 Active Galactic Nuclei (AGN) sample obtained from the first epoch data of the VIMOS-VLT Deep Survey (VVDS). The sample consists of 130 faint, broad-line AGN with redshift up to z=5 and 17.5< I, 13 pages, 10 figures, submitted to A&A
Published: 2007
Full Text: View/download PDF

21. Multi-frequency study of the B3-VLA sample

Author: Ulrich Klein, K.-H. Mack, M. Vigotti, and L. Gregorini
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, General Physics and Astronomy, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Sample (graphics), Large sample, Spectral database, Homogeneous, Range (statistics), Astrophysics::Galaxy Astrophysics
Abstract: We present total flux densities of 1049 radio sources in the frequency range from 151 MHz to 10.6 GHz. These sources belong to the B3-VLA sample, which is complete down to 100 mJy at 408 MHz. The data constitute a homogeneous spectral database for a large sample of radio sources, 50 times fainter than the 3C catalogue, and will be used to perform a spectral ageing analysis, which is one of the critical points in understanding the physics and evolution of extragalactic radio sources., Comment: 14 pages, 3 figures, accepted for publication in Astronomy & Astrophysics Supplement Series, gzipped postscript file also available at http://multivac.jb.man.ac.uk:8000/ceres/papers/papers.html or http://gladia.astro.rug.nl:8000/ceres/papers/papers.html
Published: 1999
Full Text: View/download PDF

22. Sardinia aperture array demonstrator

Author: Pietro Bolli, Giuseppe Virone, G. Serra, Matteo Murgia, Giovanni Naldi, Isabella Prandoni, Muhammad Zunnoorain Farooqui, I. Porceddu, A. Poddighe, L. Gregorini, Andrea Melis, Karl-Heinz Mack, Giovanni Comoretto, Giuseppe Pupillo, Federica Govoni, Daniele Dallacasa, Tiziana Venturi, Alberto Tibaldi, M. Schiaffino, Jader Monari, Francesco Schillirò, Marcella Massardi, Germano Bianchi, A. Mattana, L. Mureddu, Federico Perini, Francesco Gaudiomonte, A. Zanichelli, and Fabio Paonessa
Subjects: Computer science, Reflective array antenna, Low frequency, low-frequency, law.invention, Radio telescope, aperture arrays, law, Vivaldi antenna, Radio astronomy, Radio frequency, Antenna (radio), Focus (optics), Remote sensing
Abstract: We present a project aimed at realizing an Italian aperture array demonstrator constituted by prototypical Vivaldi antennas designed to operate at radio frequencies below 500 MHz. We focus on an array composed of a core plus a few satellite phased-array stations to be installed at the Sardinia Radio Telescope (SRT) site. The antenna elements are mobile and thus it will be possible to investigate the performance in terms of both uv-coverage and synthesized resolution resulting from different configurations of the array.
Published: 2014

23. Configuration study for a low-frequency aperture array at the SRT site

Author: M. Murgia, F. Govoni, J. Monari, F. Perini, Bianchi, P. Bolli, G. Comoretto, D. Dallacasa, F. Gaudiomonte, L. Gregorini, K.-H. Mack, F. Mantovani, M. Massardi, A. Mattana, A. Melis, L. Mureddu, G. Naldi, A. Poddighe, I. Porceddu, I. Prandoni, G. Pupillo, M. Schiaffino, F. Schillirò, G. Serra, T. Venturi, G. Virone, and A. Zanichelli
Published: 2014

24. A 15 years monitoring program at 408 MHz

Author: M. Bondi, A. Ficarra, F. Mantovani, R. Fanti, L. Padrielli, and L. Gregorini
Subjects: Physics, Interferometry, Monitoring data, General Physics and Astronomy, Astronomy, Sample (statistics), Astrophysics, Paper based, Monitoring program
Abstract: This is the second paper based on the 408 MHz monitoring program with the East-West arm of the Bologna interferometer. The monitoring concerned 125 radio sources measured approximately once a month for 15 years. We present the summary of the variability analysis concerning all the sample and the monitoring data, not yet published, of the variable sources.
Published: 1996
Full Text: View/download PDF

25. The molecular environment of the Galactic star forming region G19.61–0.23

Author: L. Gregorini, G. Santangelo, Frederic Schuller, Silvia Leurini, Sergio Molinari, Luca Olmi, C. M. Walmsley, Leonardo Bronfman, Alberto Noriega-Crespo, Karl M. Menten, R. Cesaroni, Sean Carey, Leonardo Testi, Santangelo G., Testi L., Leurini S., Walmsley C. M., Cesaroni R., Bronfman L., Carey S., Gregorini L., Menten K. M., Molinari S., and Noriega-Crespo A., Olmi L., Schuller F.
Subjects: Physics, education.field_of_study, Spiral galaxy, RADIO CONTINUUM, Star formation, Molecular cloud, ISM: STAR: FORMATION, Population, FOS: Physical sciences, Astronomy and Astrophysics, ISM:INDIVIDUAL OBJECT:G19.61-0.23, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galactic plane, Astrophysics - Astrophysics of Galaxies, ISM:MOLECULES, Stars, Star cluster, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, education, Astrophysics::Galaxy Astrophysics, Dwarf galaxy
Abstract: We present single-dish (sub)millimeter observations of gas and dust in the Galactic high-mass star-forming region G19.61-0.23, with the aim of studying the large-scale properties and physical conditions of the molecular gas across the region. The final aim is to compare the large-scale (about 100 pc) properties with the small-scale (about 3 pc) properties and to consider possible implications for extragalactic studies. We have mapped CO isotopologues in the J=1-0 transition using the FCRAO-14m telescope and the J=2-1 transition using the IRAM-30m telescope. We have also used data from the ATLASGAL survey and from the BU-FCRAO Galactic Ring Survey, as well as the Spitzer infrared Galactic plane surveys GLIMPSE and MIPSGAL to characterize the star-formation activity within the molecular clouds. We reveal a population of molecular clumps in the 13CO(1-0) emission. Our analysis of the 13CO suggests that the virial parameter (ratio of kinetic to gravitational energy) varies over an order of magnitude between clumps that are unbound and some that are apparently "unstable". This conclusion is independent of whether they show evidence of ongoing star formation. We find that the majority of ATLASGAL sources have MIPSGAL counterparts with luminosities in the range 10^4 - 5 10^4 Lsun and are presumably forming relatively massive stars. We compare our results with previous extragalactic studies of the nearby spiral galaxies M31 and M33; and the blue compact dwarf galaxy Henize2-10. We find that the main giant molecular cloud surrounding G19.61-0.23 has physical properties typical for Galactic GMCs and which are comparable to the GMCs in M31 and M33. However, the GMC studied here shows smaller surface densities and masses than the clouds identified in Henize2-10 and associated with super star cluster formation., Accepted for publication in Astronomy & Astrophysics
Published: 2010

26. The VIMOS-VLT Deep Survey: evolution in the halo occupation number since z∼ 1★

Author: A. Pollo, M. Bolzonella, O. Le Fevre, Yannick Mellier, S. Paltani, S. Bardelli, R. Scaramella, Angela Bongiorno, Jarle Brinchmann, R. Pello, R. Merighi, C. Adami, P. Franzetti, Marco Scodeggio, L. de Ravel, F. Lamareille, I. Gavignaud, Stéphane Charlot, D. Maccagni, V. Le Brun, O. Ilbert, Paola Merluzzi, Paolo Ciliegi, Alain Mazure, D. Bottini, A. Zanichelli, B. Garilli, Stephane Arnouts, M. Radovich, Lucia Pozzetti, Bruno Marano, T. Contini, U. Abbas, Enrique Perez-Montero, C. Marinoni, O. Cucciati, L. Tresse, S. de la Torre, M. Bondi, Luigi Guzzo, Sylvie Foucaud, G. Zamorani, E. Zucca, G. Vettolani, B. Meneux, A. Cappi, L. Gregorini, A. Iovino, H. J. McCracken, and D. Vergani
Subjects: Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Galaxy, Redshift, Space and Planetary Science, 0103 physical sciences, Dynamical friction, Halo, 10. No inequality, 010303 astronomy & astrophysics, VIMOS-VLT Deep Survey, Astrophysics::Galaxy Astrophysics
Abstract: We model the evolution of the mean galaxy occupation of dark-matter halos over the range $0.1 0.1 M_0$ merger event occuring between redshifts of 0.5 and 1.0. Futhermore, we find that more luminous galaxies are found to occupy more massive halos irrespectively of the redshift. Finally, the average number of galaxies per halo shows little increase from redshift z$\sim$ 1.0 to z$\sim$ 0.5, with a sharp increase by a factor $\sim$3 from z$\sim$ 0.5 to z$\sim$ 0.1, likely due to the dynamical friction of subhalos within their host halos.
Published: 2010
Full Text: View/download PDF

27. The VIMOS VLT Deep Survey. Evolution of the major merger rate since z ~ 1 from spectroscopically confirmed galaxy pairs

Author: S. Temporin, D. Maccagni, B. Meneux, Paola Merluzzi, O. Cucciati, T. Contini, S. de la Torre, E. Zucca, Stéphane Charlot, Sylvie Foucaud, O. Le Fevre, L. Gregorini, R. Pello, L. Tresse, S. Paltani, Roberto Scaramella, L. de Ravel, Yannick Mellier, Mario Radovich, D. Bottini, R. Merighi, G. Vettolani, A. Pollo, Marco Scodeggio, H. J. McCracken, V. Le Brun, O. Ilbert, S. Bardelli, Alain Mazure, P. Franzetti, Enrique Perez-Montero, Angela Bongiorno, Jarle Brinchmann, A. Zanichelli, A. Iovino, I. Gavignaud, M. Bondi, Paolo Ciliegi, Bruno Marano, Stephane Arnouts, M. Bolzonella, Lucia Pozzetti, A. Cappi, Luigi Guzzo, G. Zamorani, Christian Marinoni, D. Vergani, F. Lamareille, B. Garilli, P. Memeo, C. Adami, Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), INAF- Milano, Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astronomico di Bologna (OABO), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Centre de Physique Théorique - UMR 6207 (CPT), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centro de Astrofísica da Universidade do Porto (CAUP), Universidade do Porto, de Ravel L., Le Fèvre O., Tresse L., Bottini D., Garilli B., Le Brun V., Maccagni D., Scaramella R., Scodeggio M., Vettolani G., Zanichelli A., Adami C., Arnouts S., Bardelli S., Bolzonella M., Cappi A., Charlot S., Ciliegi P., Contini T., Foucaud S., Franzetti P., Gavignaud I., Guzzo L., Ilbert O., Iovino A., Lamareille F., McCracken H. J., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Paltani S., Pellò R., Pollo A., Pozzetti L., Radovich M., Vergani D., Zamorani G., Zucca E., Bondi M., Bongiorno A., Brinchmann J., Cucciati O., de La Torre S., Gregorini L., Memeo P., Perez-Montero E., Mellier Y., Merluzzi P., Temporin S., Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Universidade do Porto = University of Porto
Subjects: Physics, Stellar mass, 010308 nuclear & particles physics, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Galaxy, Space and Planetary Science, 0103 physical sciences, galaxies: interactions, Astrophysics::Solar and Stellar Astrophysics, galaxies: formation, Astrophysics::Earth and Planetary Astrophysics, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], 10. No inequality, galaxies: evolution, 010303 astronomy & astrophysics, VIMOS-VLT Deep Survey, Astrophysics::Galaxy Astrophysics
Abstract: From the VIMOS VLT Deep Survey we use a sample of 6447 galaxies with I_{AB} < 24 to identify 251 pairs of galaxies, each member with a secure spectroscopic redshift, which are close in both projected separation and in velocity. We find that at z ~ 0.9, 10.9 +/- 3.2 % of galaxies with M_B(z) < -18-Qz are in pairs with separations dr < 20 kpc/h, dv < 500 km/s, and with dM_B < 1.5, significantly larger than 3.76 +/- 1.71 % at z ~ 0.5; we find that the pair fraction evolves as (1+z)^m with m = 2.49 +/- 0.56. For brighter galaxies with M_B(z=0) < -18.77, the pair fraction is higher and its evolution with redshift is somewhat flatter with m=1.88 \pm 0.40, a property also observed for galaxies with increasing stellar masses. Early type, dry mergers, pairs increase their relative fraction from 3 % at z ~ 0.9 to 12 % at z ~ 0.5. We find that the merger rate evolves as N_{mg}=(9.05 +/- 3.76) * 10^{-4}) * (1+z)^{2.43 +/- 0.76}. We find that the merger rate of galaxies with M_B(z) < -18-Qz has significantly evolved since z ~ 1. The merger rate is increasing more rapidly with redshift for galaxies with decreasing luminosities, indicating that the flat evolution found for bright samples is not universal. The merger rate is also strongly dependent on the spectral type of galaxies involved, late type mergers being more frequent in the past, while early type mergers are more frequent today, contributing to the rise in the local density of early type galaxies. About 20 % of the stellar mass in present day galaxies with log(M/M_{sun}) > 9.5 has been accreted through major merging events since z ~ 1, indicating that major mergers have contributed significantly to the growth in stellar mass density of bright galaxies over the last half of the life of the Universe., 22 pages, 19 figures, accepted in A&A
Published: 2009
Full Text: View/download PDF

28. The VVDS-VLA deep field. IV. Radio-optical properties

Author: Daniela Vergani, P. Parma, Laurence Tresse, Jarle Brinchmann, S. Temporin, Sylvie Foucaud, D. Maccagni, P. Memeo, Agnieszka Pollo, Stéphane Paltani, R. Pello, S. de la Torre, D. Bottini, Angela Bongiorno, Roberto Scaramella, A. Mazure, Bianca Garilli, E. Zucca, B. Meneux, L. Gregorini, F. Lamareille, R. Merighi, Stéphane Arnouts, Giampaolo Vettolani, O. Le Fevre, Paola Merluzzi, H. R. de Ruiter, Ummi Abbas, Lucia Pozzetti, H. J. McCracken, A. Iovino, C. Adami, P. Franzetti, L. de Ravel, Olga Cucciati, A. Zanichelli, Stephane Charlot, Christian Marinoni, Paolo Ciliegi, M. Radovich, Yannick Mellier, Enrique Pérez-Montero, A. Cappi, Micol Bolzonella, Bruno Marano, Luigi Guzzo, M. Bondi, V. Le Brun, S. Bardelli, O. Ilbert, Thierry Contini, I. Gavignaud, G. Zamorani, M. Scodeggio, INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Bardelli S., Zucca E., Bolzonella M., Ciliegi P., Gregorini L., Zamorani G., Bondi M., Zanichelli A., Tresse L., Vergani D., Gavignaud I., Bongiorno A., Bottini D., Garilli B., Le Brun V., Le Fèvre O., Maccagni D., Scaramella R., Scodeggio M., Vettolani G., Adami C., Arnouts S., Cappi A., Charlot S., Contini T., Foucaud S., Franzetti P., Guzzo L., Ilbert O., Iovino A., Lamareille F., McCracken H. J., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Paltani S., Pellò R., Pollo A., Pozzetti L., Radovich M., Abbas U., Brinchmann J., Cucciati O., de La Torre S., de Ravel L., Memeo P., Perez-Montero E., Mellier Y., Merluzzi P., Temporin S., de Ruiter H. R., Parma P., Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS-PSL)
Subjects: Hubble Deep Field, Astrophysics::High Energy Astrophysical Phenomena, Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, GALASSIE: RADIO, Photometry (optics), GALASSIE: SURVEY, 0103 physical sciences, fundamental parameters [galaxies], Astrophysics::Solar and Stellar Astrophysics, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, radio continuum: galaxies, education.field_of_study, 010308 nuclear & particles physics, Star formation, Astrophysics (astro-ph), Astronomy and Astrophysics, galaxies: fundamental parameters, Rest frame, luminosity function, mass function [galaxies], galaxies: general, galaxies [radio continuum], Redshift, Galaxy, galaxies: luminosity function, Space and Planetary Science, mass function, QUIET, GALASSIE: PROPRIETÀ RADIO-OTTICHE, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], general [galaxies]
Abstract: (abridged) We use the 1.4 GHz VIMOS-VLA Deep Survey and the optical VVDS and the CFHT-LS to compare the properties of radio loud galaxies with respect to the whole population of optical galaxies. The availability of multiband photometry and high quality photometric redshifts allows to derive rest frame colors and radio luminosity functions down to a limit of a B rest-frame magnitude of M=-20. Galaxy properties and luminosity functions (LFs) are estimated up to z~1 for radio loud and radio quiet early and late type galaxies. Radio loud late type galaxies are redder than radio quiet objects of the same class and this is an effect related to the presence of more dust in stronger star forming galaxies. Moreover, we estimate optical LFs, stellar masses and star formation rate distributions for radio sources and compare them with those derived for a well defined control sample, finding that the probability for a galaxy to be a radio emitter significantly increases at high values of these parameters. Radio loud early type galaxies show luminosity evolution of their bivariate radio-optical LF, due to an evolution in the radio-optical ratio. The lack of evolution of the mass function of radio loud early type galaxies means that no new AGN are formed at z0.7. This evolution is the direct effect of the strong optical evolution of this class and no significant change with redshift of the radio-optical ratio is required. With the knowledge of the radio-optical ratio and the optical and radio LFs for late type galaxies, we estimated the star formation history of the Universe up to z~1.5, using optical galaxies as tracers of the global radio emission., 17 pages, A&A in press
Published: 2009
Full Text: View/download PDF

29. Resolving the molecular environment of super star clusters in Henize 2-10

Author: G. Santangelo, Silvia Leurini, Leonardo Testi, David J. Wilner, C. M. Walmsley, L. Gregorini, Leonardo Vanzi, Santangelo G., Testi L., Gregorini L., Leurini S., Vanzi L., Walmsley C.M., and Wilner D.J.
Subjects: Physics, Star formation, Molecular cloud, GALAXIES: STARBURST, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, GALAXIES: INDIVIDUAL: HENIZE 2-10, GALAXIES: DWARF, Submillimeter Array, Astrophysics - Astrophysics of Galaxies, Galaxy, Stars, Star cluster, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Irregular galaxy, Dwarf galaxy
Abstract: The rate of star formation both in the Galaxy and in external galaxies should be related to the physical properties of the molecular clouds from which stars form. This is expected for the starbursts found both in irregular galaxies and in some mergers. The dwarf galaxy Henize 2-10 is particularly interesting in this context as it shows a number of newly formed Super Star Clusters (SSCs) associated with a very rich molecular environment. We present a high angular resolution study of the molecular gas associated with the SSCs with the aim of deriving the physical properties of the parent molecular clouds. The final goal is to test the expectation that the formation of SSCs requires exceptionally dense and massive clouds. We have used the Submillimeter Array with an angular resolution of 1.9 X 1.3 to map the J=2-1 transition of CO in Henize 2-10. Supplementary measurements of HCN(J=1-0), 13CO(J=2-1) and millimeter continuum were obtained with the APEX, IRAM-30m and SEST single dish telescopes. Our single dish observations confirm the association of the newly formed SSCs in Henize 2-10 with dense molecular gas. Our interferometric observations resolve the CO(2-1) emission in several giant molecular clouds. Overall the molecular gas accounts for approximately half of the mass in the central regions of Henize 2-10. Although we find indications that the molecular clouds associated with the formation of SSCs in Henize 2-10 are massive and dense, the tracer we used (CO) and the linear resolution of our observations (60 X 80 pc) are still not adequate to test the expectation that exceptionally dense and massive cores are required for SSCs formation., Comment: 10 pages, 7 figures, 3 tables; Accepted for publication in Astronomy and Astrophysics
Published: 2009

30. The ATESP 5 GHz radio survey. III. 4.8, 8.6 and 19 GHz follow-up observations of radio galaxies

Author: Isabella Prandoni, Ronald D. Ekers, H. R. de Ruiter, P. Parma, Roberto Ricci, L. Gregorini, Prandoni I., de Ruiter H.R., Ricci R., Parma P., Gregorini L., and Ekers R.D.
Subjects: CATALOGS, Physics, education.field_of_study, Cosmology and Nongalactic Astrophysics (astro-ph.CO), RADIO CONTINUUM, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Population, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Spectral line, Accretion (astrophysics), Redshift, Galaxy, GALAXIES: GENERAL, Space and Planetary Science, Radiative transfer, education, SURVEYS, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: [Abridged] Physical and evolutionary properties of the sub-mJy radio population are not entirely known. The radio/optical analysis of the ATESP 5 GHz sample has revealed a significant class of compact flat/inverted radio-spectrum sources associated to early-type galaxies up to redshift 2. Such sources are most plausibly triggered by an AGN, but their observational properties are not entirely consistent with those of standard radio galaxy populations. In the present work we aim at a better understanding of the radio spectra of such sources and ultimately of the nature of AGNs at sub-mJy flux levels. We used the ATCA to get multi-frequency (4.8, 8.6 and 19 GHz) quasi-simultaneous observations for a representative sub-sample of ATESP radio sources associated with early-type galaxies (26 objects with S>0.6 mJy). This can give us insight into the accretion/radiative mechanism that is at work, since different regimes display different spectral signatures in the radio domain. From the analysis of the radio spectra, we find that our sources are most probably jet-dominated systems. ADAF models are ruled out by the high frequency data, while ADAF+jet scenarios are still consistent with flat/moderately inverted-spectrum sources, but are not required to explain the data. We compared our sample with high (>20 GHz) frequency selected surveys, finding spectral properties very similar to the ones of much brighter (S>500 mJy) radio galaxies extracted from the Massardi et al. (2008) sample. Linear sizes of ATESP 5 GHz sources associated with early type galaxies are also often consistent with the ones of brighter B2 and 3C radio galaxies, with possibly a very compact component that could be associated at least in part to (obscured) radio-quiet quasar-like objects and/or low power BL Lacs., Accepted for publication in Astronomy & Astrophysics
Published: 2009
Full Text: View/download PDF

31. The Vimos VLT Deep Survey. Stellar mass segregation and large-scale galaxy environment in the redshift range 0.2 < z < 1.4

Author: E. Zucca, Paolo Ciliegi, C. J. Walcher, V. Le Brun, Bianca Garilli, Ummi Abbas, Laurence Tresse, C. Adami, S. Temporin, M. Radovich, A. Iovino, L. Gregorini, Sylvie Foucaud, Giampaolo Vettolani, D. Maccagni, D. Vergani, Stéphane Paltani, Roberto Scaramella, A. Mazure, D. Bottini, R. Merighi, R. Pello, Angela Bongiorno, L. de Ravel, H. J. McCracken, Luigi Guzzo, S. Bardelli, Yannick Mellier, Lucia Pozzetti, O. Le Fèvre, A. Cappi, P. Franzetti, Olga Cucciati, F. Lamareille, A. Zanichelli, Bruno Marano, M. Bondi, S. Arnouts, Stephane Charlot, Enrique Pérez-Montero, B. Meneux, M. Scodeggio, Thierry Contini, I. Gavignaud, G. Zamorani, Jarle Brinchmann, P. Memeo, Christian Marinoni, S. de la Torre, Agnieszka Pollo, M. Bolzonella, O. Ilbert, Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), INAF-Osservatorio Astronomico di Brera, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Bologna (OABO), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astrofisico di Torino (INAF-OATo), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), IRA-INAF, Bologna, Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astrophysik (MPA), School of Physics and Astronomy, University of Nottingham, Astrophysikalisches Institut Potsdam (AIP), Institute for Astronomy, University of Hawaii, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Extraterrestriche Physik (MPE), INTEGRAL Science Data Centre, The Andrzej Soltan Institute for Nuclear Studies, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Centro de Astrofisica da Universidade do Porto (CAUP), Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, Scodeggio M., Vergani D., Cucciati O., Iovino A., Franzetti P., Garilli B., Lamareille F., Bolzonella M., Pozzetti L., Abbas U., Marinoni C., Contini T., Bottini D., Le Brun V., Le Fèvre O., Maccagni D., Scaramella R., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnouts S., Bardelli S., Cappi A., Charlot S., Ciliegi P., Foucaud S., Gavignaud I., Guzzo L., Ilbert O., McCracken H. J., Marano B., Mazure A., Meneux B., Merighi R., Paltani S., Pellò R., Pollo A., Radovich M., Zamorani G., Zucca E., Bondi M., Bongiorno A., Brinchmann J., de La Torre S., de Ravel L., Gregorini L., Memeo P., Perez-Montero E., Mellier Y., Temporin S., and Walcher C. J.
Subjects: Physics, education.field_of_study, Stellar mass, Population, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Redshift, Galaxy, COSMOLOGIA: GALASSIE, Dark matter halo, Space and Planetary Science, Range (statistics), Galaxy formation and evolution, Astrophysics::Earth and Planetary Astrophysics, COSMOLOGIA: REDSHIFT SURVEYS, Halo, education, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Hierarchical models of galaxy formation predict that the properties of a dark matter halo depend on the large-scale environment surrounding the halo. As a result of this correlation, we expect massive haloes to be present in larger number in overdense regions than in underdense ones. Given that a correlation exists between a galaxy stellar mass and the hosting dark matter halo mass, the segregation in dark matter halo mass should then result in a segregation in the distribution of stellar mass in the galaxy population. In this work we study the distribution of galaxy stellar mass and rest-frame optical color as a function of the large-scale galaxy distribution using the VLT VIMOS Deep Survey sample, in order to verify the presence of segregation in the properties of the galaxy population. We use the VVDS redshift measurements and multi-band photometric data to derive estimates of the stellar mass, rest-frame optical color, and of the large-scale galaxy density, on a scale of approximately 8 Mpc, for a sample of 5619 galaxies in the redshift range 0.20.7. However, when we consider only galaxies in narrow bins of stellar mass, in order to exclude the effects of the stellar mass segregation on the galaxy properties, we do not observe any more any significant color segregation., Comment: 7 pages, 5 figures; accepted for publication in Astronomy and Astrophysics
Published: 2009
Full Text: View/download PDF

32. Eddington ratios of faint AGN at intermediate redshift: evidence for a population of half-starved black holes

Author: Roberto Scaramella, A. Mazure, Christian Marinoni, Vincenzo Ripepi, R. Merighi, Yannick Mellier, M. Radovich, Stéphane Arnouts, Laurence Tresse, G. Zamorani, B. Husemann, Angela Bongiorno, V. Le Brun, Paolo Ciliegi, P. Franzetti, E. Zucca, D. Rizzo, Thierry Contini, Paola Merluzzi, A. Cappi, A. Zanichelli, Daniela Vergani, B. Meneux, Sylvie Foucaud, I. Gavignaud, Lucia Pozzetti, Bruno Marano, M. Scodeggio, Lutz Wisotzki, Magda Arnaboldi, Giampaolo Vettolani, Luigi Guzzo, Bianca Garilli, A. Pollo, Palle Møller, M. Bolzonella, R. Pello, M. Bondi, M. Schramm, Stephane Charlot, D. Bottini, F. Lamareille, A. Iovino, S. Bardelli, O. Cucciati, O. Ilbert, G. Busarello, S. de la Torre, D. Maccagni, Stéphane Paltani, O. Le Fevre, H. J. McCracken, L. Gregorini, C. Adami, European Southern Observatory (ESO), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre de Physique Théorique - UMR 6207 (CPT), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), INAF- Milano, Istituto Nazionale di Astrofisica (INAF), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Gavignaud I., Wisotzki L., Bongiorno A., Paltani S., Zamorani G., Møller P., Le Brun V., Husemann B., Lamareille F., Schramm M., Le Fèvre O., Bottini D., Garilli B., Maccagni D., Scaramella R., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnaboldi M., Arnouts S., Bardelli S., Bolzonella M., Cappi A., Charlot S., Ciliegi P., Contini T., Foucaud S., Franzetti P., Guzzo L., Ilbert O., Iovino A., McCracken H. J., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Pellò R., Pollo A., Pozzetti L., Radovich M., Zucca E., Bondi M., Busarello G., Cucciati O., de La Torre S., Gregorini L., Mellier Y., Merluzzi P., Ripepi V., Rizzo D., and Vergani D.
Subjects: ACTIVE GALACTIC NUCLEI, Active galactic nucleus, Astrophysique (Planète et Univers), Astrophysics::High Energy Astrophysical Phenomena, Population, galaxies: active, enquête, EXTRAGALACTIC SURVEYS, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Virial theorem, symbols.namesake, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, BLACK HOLES, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Line (formation), Physics, Electronic appendix, education.field_of_study, 010308 nuclear & particles physics, galaxie, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Redshift, galaxies: Seyfert, Space and Planetary Science, COSMOLOGY, Eddington luminosity, symbols, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], catalogue, galaxies: nuclei, VIMOS-VLT Deep Survey, catalogs, surveys, quasars:general
Abstract: We use one of the deepest spectroscopic samples of broad line active galactic nuclei (AGN) currently available, extracted from the VIMOS VLT Deep Survey (VVDS), to compute MgII and CIV virial masses estimate of 120 super-massive black holes in the redshift range 1.0, Comment: accepted for publication in Astronomy & Astrophysics
Published: 2008
Full Text: View/download PDF

33. The VIMOS VLT Deep Survey. Testing the gravitational instability paradigm at z ~ 1

Author: C. Marinoni, L. Guzzo, A. Cappi, O. Le Fèvre, A. Mazure, B. Meneux, A. Pollo, A. Iovino, H. J. McCracken, R. Scaramella, S. de la Torre, J. M. Virey, D. Bottini, B. Garilli, V. Le Brun, D. Maccagni, J. P. Picat, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, I. Gavignaud, O. Ilbert, F. Lamareille, B. Marano, G. Mathez, R. Merighi, S. Paltani, R. Pellò, L. Pozzetti, M. Radovich, D. Vergani, G. Zamorani, E. Zucca, U. Abbas, M. Bondi, A. Bongiorno, J. Brinchmann, A. Buzzi, O. Cucciati, L. de Ravel, L. Gregorini, Y. Mellier, P. Merluzzi, E. Perez-Montero, P. Taxil, S. Temporin, C. J. Walcher, Centre de Physique Théorique - UMR 6207 (CPT), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), INAF- Milano, Istituto Nazionale di Astrofisica (INAF), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), INAF - Osservatorio Astronomico di Brera (OAB), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astronomico di Bologna (OABO), European Southern Observatory (ESO), INAF - Osservatorio Astronomico di Capodimonte (OAC), Istituto di Radioastronomia [Bologna] (IRA), Centro de Astrofísica da Universidade do Porto (CAUP), Universidade do Porto, Bernardo, Elizabeth, AUTRES, Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Universidade do Porto = University of Porto, Marinoni C., Guzzo L., Cappi A., Le Fèvre O., Mazure A., Meneux B., Pollo A., Iovino A., McCracken H. J., Scaramella R., de La Torre S., Virey J. M., Bottini D., Garilli B., Le Brun V., Maccagni D., Picat J. P., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnouts S., Bardelli S., Bolzonella M., Charlot S., Ciliegi P., Contini T., Foucaud S., Franzetti P., Gavignaud I., Ilbert O., Lamareille F., Marano B., Mathez G., Merighi R., Paltani S., Pellò R., Pozzetti L., Radovich M., Vergani D., Zamorani G., Zucca E., Abbas U., Bondi M., Bongiorno A., Brinchmann J., Buzzi A., Cucciati O., de Ravel L., Gregorini L., Mellier Y., Merluzzi P., Perez-Montero E., Taxil P., Temporin S., and Walcher C. J.
Subjects: statistics [galaxies], Distribution (number theory), Field (physics), FOS: Physical sciences, Probability density function, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], 01 natural sciences, Measure (mathematics), GALASSIE, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], GRAVITAZIONE, galaxies: high-redshift, cosmology: theory, 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, galaxies: statistics, Physics, large-scale structure of Universe [cosmology], Galaxy: evolution, theory [cosmology], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Astronomy and Astrophysics, COSMOLOGIA, COSMOLOGIA OSSERVATIVA, cosmology: large-scale structure of Universe, Redshift, Galaxy, SURVEY, Space and Planetary Science, Skewness, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], evolution [galaxy], Perturbation theory (quantum mechanics), [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], high-redshift [galaxies]
Abstract: We have reconstructed the three-dimensional density fluctuation maps to z ~ 1.5 using the distribution of galaxies observed in the VVDS-Deep survey. We use this overdensity field to measure the evolution of the probability distribution function and its lower-order moments over the redshift interval 0.7, Comment: 14 pages, 5 figures, A&A in Press
Published: 2008
Full Text: View/download PDF

34. The VIMOS VLT Deep Survey. Tracing the galaxy stellar mass assembly history over the last 8 Gyr

Author: D. Vergani, M. Scodeggio, L. Pozzetti, A. Iovino, P. Franzetti, B. Garilli, G. Zamorani, D. Maccagni, F. Lamareille, O. Le Fèvre, S. Charlot, T. Contini, L. Guzzo, D. Bottini, V. Le Brun, J. P. Picat, R. Scaramella, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, A. Cappi, P. Ciliegi, S. Foucaud, I. Gavignaud, O. Ilbert, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pellò, A. Pollo, M. Radovich, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, O. Cucciati, S. de la Torre, L. Gregorini, E. Perez-Montero, Y. Mellier, P. Merluzzi, S. Temporin, INAF- Milano, Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astronomico di Bologna (OABO), INAF - Osservatorio Astronomico di Brera (OAB), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Centre de Physique Théorique - UMR 6207 (CPT), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astronomico di Capodimonte (OAC), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Centro de Astrofísica da Universidade do Porto (CAUP), Universidade do Porto = University of Porto, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), AUTRES, Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Observatoire de Paris - Site de Paris (OP), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Services communs OMP (UMS 831), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), École normale supérieure - Paris (ENS Paris), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Università di Bologna, Dipartimento di Astronomia, Universidade do Porto, Beaussier, Catherine, Vergani D., Scodeggio M., Pozzetti L., Iovino A., Franzetti P., Garilli B., Zamorani G., Maccagni D., Lamareille F., Le Fèvre O., Charlot S., Contini T., Guzzo L., Bottini D., Le Brun V., Picat J. P., Scaramella R., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnouts S., Bardelli S., Bolzonella M., Cappi A., Ciliegi P., Foucaud S., Gavignaud I., Ilbert O., McCracken H. J., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Paltani S., Pellò R., Pollo A., Radovich M., Zucca E., Bondi M., Bongiorno A., Brinchmann J., Cucciati O., de La Torre S., Gregorini L., Perez-Montero E., Mellier Y., Merluzzi P., and Temporin S.
Subjects: Stellar mass, formation [galaxies], Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: fundamental, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], 01 natural sciences, GALASSIE, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], symbols.namesake, 0103 physical sciences, Galaxy formation and evolution, fundamental parameters [galaxies], Astrophysics::Solar and Stellar Astrophysics, galaxies: formation, education, 010303 astronomy & astrophysics, evolution [galaxies], Astrophysics::Galaxy Astrophysics, Physics, parameters, SPETTROGRAFIA, education.field_of_study, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], EVOLUZIONE, 010308 nuclear & particles physics, Star formation, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Balmer series, Astronomy and Astrophysics, COSMOLOGIA, luminosity function, mass function [galaxies], Galaxy, Redshift, observations [cosmology], Stars, galaxies: luminosity function, Space and Planetary Science, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], mass function, cosmology: observations, symbols, Astrophysics::Earth and Planetary Astrophysics, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], galaxies: evolution
Abstract: We selected a mass-limited sample of 4048 objects from the VIMOS VLT Deep Survey in the redshift interval 0.5, Comment: Accepted for pubblication in A&A, 14 pages, 5 figures
Published: 2008
Full Text: View/download PDF

35. The Vimos VLT Deep Survey: Global properties of 20000 galaxies in the I_AB<=22.5 WIDE survey

Author: O. Cucciati, G. Vettolani, G. Zamorani, S. de la Torre, H. J. McCracken, C. Adami, B. Garilli, Marco Scodeggio, A. Cappi, Paolo Ciliegi, L. Tresse, A. Pollo, D. Maccagni, E. Zucca, T. Contini, J. Blaizot, S. Bardelli, R. Scaramella, M. Radovich, A. Iovino, L. Gregorini, V. Le Brun, O. Ilbert, C. Marinoni, M. Bolzonella, F. Lamareille, Luigi Guzzo, P. Franzetti, D. Bottini, A. Zanichelli, Alain Mazure, R. Pello, O. Le Fevre, I. Gavignaud, Bruno Marano, C. Moreau, S. Paltani, R. Merighi, Yannick Mellier, L. Paioro, Sylvie Foucaud, Stephane Arnouts, D. Vergani, Lucia Pozzetti, B. Meneux, Stéphane Charlot, Angela Bongiorno, Centre de Physique Théorique - UMR 6207 (CPT), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, INAF- Milano, Istituto Nazionale di Astrofisica (INAF), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astronomico di Brera (OAB), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), INAF - Osservatorio Astronomico di Bologna (OABO), INAF - Osservatorio Astronomico di Capodimonte (OAC), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Università di Bologna, Dipartimento di Astronomia, École normale supérieure - Paris (ENS Paris), Garilli B., Le Fèvre O., Guzzo L., Maccagni D., Le Brun V., de La Torre S., Meneux B., Tresse L., Franzetti P., Zamorani G., Zanichelli A., Gregorini L., Vergani D., Bottini D., Scaramella R., Scodeggio M., Vettolani G., Adami C., Arnouts S., Bardelli S., Bolzonella M., Cappi A., Charlot S., Ciliegi P., Contini T., Foucaud S., Gavignaud I., Ilbert O., Iovino A., Lamareille F., McCracken H. J., Marano B., Marinoni C., Mazure A., Merighi R., Paltani S., Pellò R., Pollo A., Pozzetti L., Radovich M., Zucca E., Blaizot J., Bongiorno A., Cucciati O., Mellier Y., Moreau C., and Paioro L.
Subjects: Field (physics), REDSHIFT, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Correlation function (astronomy), 01 natural sciences, GALASSIE, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, 010303 astronomy & astrophysics, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astronomy and Astrophysics, galaxies: fundamental parameters, Cosmic variance, COSMOLOGIA OSSERVATIVA, cosmology: large-scale structure of Universe, SURVEY, Galaxy, Redshift, Stars, Space and Planetary Science, Limiting magnitude, cosmology: observations, Magnitude (astronomy), [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], catalogs
Abstract: The VVDS-Wide survey has been designed with the general aim of tracing the large-scale distribution of galaxies at z~1 on comoving scales reaching ~100Mpc/h, while providing a good control of cosmic variance over areas as large as a few square degrees. This is achieved by measuring redshifts with VIMOS at the ESO VLT to a limiting magnitude I_AB=22.5, targeting four independent fields with size up to 4 sq.deg. each. The whole survey covers 8.6 sq.deg., here we present the general properties of the current redshift sample. This includes 32734 spectra in the four regions (19977 galaxies, 304 type I AGNs, and 9913 stars), covering a total area of 6.1 sq.deg, with a sampling rate of 22 to 24%. The redshift success rate is above 90% independently of magnitude. It is the currently largest area coverage among redshift surveys reaching z~1. We give the mean N(z) distribution averaged over 6.1 sq.deg. Comparing galaxy densities from the four fields shows that in a redshift bin Deltaz=0.1 at z~1 one still has factor-of-two variations over areas as large as ~0.25 sq.deg. This level of cosmic variance agrees with that obtained by integrating the galaxy two-point correlation function estimated from the F22 field alone, and is also in fairly good statistical agreement with that predicted by the Millennium mocks. The variance estimated over the survey fields shows explicitly how clustering results from deep surveys of even ~1 sq.deg. size should be interpreted with caution. This paper accompanies the public release of the first 18143 redshifts of the VVDS-Wide survey from the 4 sq.deg. contiguous area of the F22 field at RA=22h, publicly available at http://cencosw.oamp.fr, Comment: Accepted for publication on Astronomy & Astrophysics
Published: 2008
Full Text: View/download PDF

36. Radio observations of early-type galaxies with dust lanes

Author: Antonio Messina, L. Gregorini, and G. Vettolani
Subjects: Luminous infrared galaxy, Physics, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, Astronomy and Astrophysics, Quasar, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Galaxy, Accretion (astrophysics), Dust lane, X-shaped radio galaxy, Space and Planetary Science, Astrophysics::Galaxy Astrophysics, Cosmic dust
Abstract: Radio and optical images of early-type galaxies with dust lanes have been analyzed in order to investigate the characteristics of the radio emission and to compare it with their properties at other frequencies. Except three galaxies, the remaining sources of our sample have diffuse radio emission, which does not extend beyond the stellar disk. The radio structures are small and weak (linear sizes in the range 2–10 kpc and radio powers in the range 5×1020–5×1021W Hz−1). Our preliminary results show that in a minority of cases (the most powerful radio sources) radio emission originates in the associated galactic nuclei, where a massive black hole is harboured. On the contrary, in the less powerful among our radio galaxies, sources originating from stellar phenomena may play and important role. We have classified the galaxies with respect to the dust lane morphology, comparing it with the radio emission. The sample is too small in order to reach firm conclusions, but the lack of radio sources in early-type galaxies with dust lanes along the galaxy minor axis seems to suggest that the accretion of material does not reach the conditions necessary to trigger nuclear activity.
Published: 1990
Full Text: View/download PDF

37. RADIO CONTINUUM, CO, AND THERMAL INFRARED EMISSION IN NEARBY STAR-FORMING GALAXIES

Author: L. Gregorini, Matteo Murgia, Norikazu Mizuno, Tamara T Helfer, Ronald D. Ekers, Luca Moscadelli, Rosita Paladino, Lister Staveley-Smith, Leo Blitz, Annie Hughes, Yasuo Fukui, Tony Wong, and Miroslav Filipovic
Subjects: Luminous infrared galaxy, Physics, Thermal infrared, Spiral galaxy, Continuum (measurement), X-shaped radio galaxy, Radio galaxy, Cosmic infrared background, Astronomy, Galaxy
Published: 2007
Full Text: View/download PDF

38. Spectral Aging in the Relic Radio Galaxy B2 0924+30

Author: L. Gregorini, Uli Klein, K.-H. Mack, Marek Jamrozy, and P. Parma
Subjects: Physics, Spectral index, Active galactic nucleus, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Flux, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Synchrotron, Radio spectrum, law.invention, Wavelength, X-shaped radio galaxy, law, Astrophysics::Galaxy Astrophysics
Abstract: The radio spectrum of the relic radio galaxy B2 0924+30 is investigated using integrated flux densities between 0.151 and 10.6 GHz, as well as images at 0.325, 0.609, 1.400 and 4.750 GHz. Allowing for synchrotron and inverse Compton losses in this source, the observed spectral steepening yields a break frequency of ∼7 GHz, implying a mean particle age of about 50 Myrs. The corresponding particle advance speed is of the order of 2000 km s −1 . This relatively small particle lifetime following the exhaustion of the central source can explain the paucity of such sources and implies that such objects would easily escape detection if searched for in the cm wavelength regime.
Published: 2007
Full Text: View/download PDF

39. The VVDS-VLA deep field. III. GMRT observations at 610 MHz and the radio spectral index properties of the sub-mJy population

Author: R. Athreya, L. Gregorini, Thierry Contini, E. Zucca, Daniela Vergani, O. Le Fevre, Paolo Ciliegi, S. Bardelli, Daniele Dallacasa, A. Iovino, Bianca Garilli, M. Bondi, S. Temporin, A. Zanichelli, Tiziana Venturi, Bondi M., Ciliegi P., Venturi T., Dallacasa D., Bardelli S., Zucca E., Athreya R. M., Gregorini L., Zanichelli A., Le Fèvre O., Contini T., Garilli B., Iovino A., Temporin S., Vergani D., Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), and Beaussier, Catherine
Subjects: Physics, QSOS, education.field_of_study, Spectral index, Hubble Deep Field, Astrophysics (astro-ph), Population, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Low frequency, Galaxy, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, Source counts, education
Abstract: We present the low frequency (610 MHz) radio source counts of the VVDS-VLA field and investigate the radio spectral index properties of the sub-mJy population. We use new deep (r.m.s.$\simeq 50$ $\mu$Jy/beam) observations of the VVDS-VLA field obtained at 610 MHz with the GMRT and matched in resolution (6 arcsec) with already available VLA data at 1.4 GHz on the same field. We find evidence of a change of the dominant population of radio sources below 0.5 mJy (at 1.4 GHz): between 0.15 and 0.5 mJy the median spectral index is significantly flatter ($\alpha=-0.46\pm 0.03$) than that of brighter sources ($\alpha=-0.67\pm 0.05$). A relevant contribution below 0.5 mJy from a population of flat spectrum low luminosity compact AGNs and radio quiet QSOs could explain this effect. At even fainter flux density, between 0.10 and 0.15 mJy at 1.4 GHz, the median spectral index steepens again ($\alpha=-0.61\pm 0.04$) suggesting that the contribution of starburst galaxies becomes important below $\sim 0.2$ mJy. Finally we present a sample of 58 candidate ultra-steep sources with radio flux density from one to two orders of magnitude lower than any other sample of such objects., Comment: Accepted for publication in Astronomy & Astrophysics
Published: 2007

40. The ATESP Radio Survey Optical Follow-Up in the EIS-A Region

Author: H. R. de Ruiter, L. Gregorini, Isabella Prandoni, A. Zanichelli, M. H. Wieringa, G. Vettolani, P. Parma, and Ron Ekers
Published: 2006
Full Text: View/download PDF

41. Probing the Faint Radio Population Through Multi-Wavelength Information

Author: Ron Ekers, G. Vettolani, Hans de Ruiter, Mark H. Wieringa, P. Parma, L. Gregorini, and Isabella Prandoni
Subjects: Physics, education.field_of_study, Population, Astronomy, Multi wavelength, Astrophysics, education
Published: 2006
Full Text: View/download PDF

42. The VIMOS VLT Deep Survey - Evolution of the luminosity functions by galaxy type up to z=1.5 from first epoch data

Author: G. Zamorani, Stéphane Charlot, J. P. Picat, O. Le Fevre, A. Cappi, S. Paltani, E. Zucca, D. Rizzo, O. Cucciati, D. Bottini, A. Pollo, Roberto Scaramella, R. Merighi, Stephane Arnouts, G. Busarello, Yannick Mellier, L. Gregorini, Lucia Pozzetti, Sylvie Foucaud, D. Maccagni, Paolo Ciliegi, M. Bolzonella, S. Bardelli, B. Garilli, V. Ripepi, Bruno Marano, M. Bondi, G. Vettolani, C. Adami, Magda Arnaboldi, T. Contini, H. J. McCracken, B. Meneux, F. Lamareille, R. Pello, Paola Merluzzi, Christian Marinoni, Mario Radovich, A. Iovino, G. Mathez, I. Gavignaud, Angela Bongiorno, Marco Scodeggio, P. Franzetti, L. Tresse, A. Zanichelli, Alain Mazure, V. Le Brun, O. Ilbert, Luigi Guzzo, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Bologna (OABO), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Istituto di Radioastronomia, Bologna, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Max-Planck-Institut für Astrophysik (MPA), European Southern Observatory (ESO), INAF-Osservatorio Astronomico di Brera, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Zucca E., Ilbert O., Bardelli S., Tresse L., Zamorani G., Arnouts S., Pozzetti L., Bolzonella M., McCracken H. J., Bottini D., Garilli B., Le Brun V., Le Fevre O., Maccagni D., Picat J.P., Scaramella R., Scodeggio M., Vettolani G., Zanichelli A., Adami C., Arnaboldi M., Cappi A., Charlot S., Ciliegi P., Contini T., Foucaud S., Franzetti P., Gavignaud I., Guzzo L., Iovino A., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Paltani S., Pello' R., Pollo A., Radovich M., Bondi M., Bongiorno A., Busarello G., Cucciati O., Gregorini L., Lamareille F., Mathez G., Mellier Y., Merluzzi P., Ripepi V., and Rizzo D.
Subjects: Physics, 010308 nuclear & particles physics, Epoch (astronomy), Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Rest frame, Stellar classification, 01 natural sciences, Redshift, Galaxy, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, [SDU]Sciences of the Universe [physics], 0103 physical sciences, Magnitude (astronomy), 10. No inequality, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Luminosity function (astronomy)
Abstract: From the first epoch observations of the VVDS up to z=1.5 we have derived luminosity functions (LF) of different spectral type galaxies. The VVDS data, covering ~70% of the life of the Universe, allow for the first time to study from the same sample and with good statistical accuracy the evolution of the LFs by galaxy type in several rest frame bands from a purely magnitude selected sample. The magnitude limit of the VVDS allows the determination of the faint end slope of the LF with unprecedented accuracy. Galaxies have been classified in four spectral classes, using their colours and redshift, and LFs have been derived in the U, B, V, R and I rest frame bands from z=0.05 to z=1.5. We find a significant steepening of the LF going from early to late types. The M* parameter is significantly fainter for late type galaxies and this difference increases in the redder bands. Within each of the galaxy spectral types we find a brightening of M* with increasing redshift, ranging from =< 0.5 mag for early type galaxies to ~1 mag for the latest type galaxies, while the slope of the LF of each spectral type is consistent with being constant with redshift. The LF of early type galaxies is consistent with passive evolution up to z~1.1, while the number of bright early type galaxies has decreased by ~40% from z~0.3 to z~1.1. We also find a strong evolution in the normalization of the LF of latest type galaxies, with an increase of more than a factor 2 from z~0.3 to z~1.3: the density of bright late type galaxies in the same redshift range increases of a factor ~6.6. These results indicate a strong type-dependent evolution and identifies the latest spectral types as responsible for most of the evolution of the UV-optical luminosity function out to z=1.5., 18 pages with encapsulated figures, revised version after referee's comments, accepted for publication in A&A
Published: 2006
Full Text: View/download PDF

43. The VIMOS VLT Deep Survey: the build-up of the colour-density relation

Author: V. Le Brun, O. Ilbert, C. Adami, G. Zamorani, G. Busarello, Marco Scodeggio, Gianpaolo Vettolani, H. J. McCracken, D. Maccagni, Paola Merluzzi, Stéphane Paltani, I. Gavignaud, E. Zucca, D. Rizzo, B. Garilli, M. Bolzonella, Christian Marinoni, Angela Bongiorno, A. Cappi, Luigi Guzzo, T. Contini, D. Vergani, R. Pello, L. Gregorini, G. Mathez, L. Tresse, Magda Arnaboldi, Mario Radovich, F. Lamareille, Stéphane Charlot, G. Temporin, A. Pollo, S. Bardelli, Stephane Arnouts, A. Zanichelli, Lucia Pozzetti, Paolo Ciliegi, V. Ripepi, Yannick Mellier, Alain Mazure, D. Bottini, O. Le Fevre, P. Franzetti, M. Bondi, J. P. Picat, Sylvie Foucaud, O. Cucciati, S. de la Torre, Bruno Marano, Roberto Scaramella, A. Iovino, R. Merighi, B. Meneux, INAF-Osservatorio Astronomico di Brera, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Bologna (OABO), Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), IRA-INAF, Bologna, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Max-Planck-Institut für Astrophysik (MPA), European Southern Observatory (ESO), INTEGRAL Science Data Centre, and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)
Subjects: Physics, 010504 meteorology & atmospheric sciences, Star formation, Diagram, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Function (mathematics), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Rest frame, 01 natural sciences, Redshift, Bin, Galaxy, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, 0103 physical sciences, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences
Abstract: We investigate the redshift and luminosity evolution of the galaxy colour-density relation using the data from the First Epoch VIMOS-VLT Deep Survey (VVDS). The size (6582 galaxies), depth (I_AB, 17 pages, 10 figures, figures added, accepted by A&A
Published: 2006
Full Text: View/download PDF

44. The VIMOS-VLT Deep Survey. The evolution of galaxy clustering per spectral type to z ~= 1.5

Author: Christian Marinoni, T. Contini, Luigi Guzzo, Paolo Ciliegi, G. Zamorani, A. Cappi, O. Cucciati, Angela Bongiorno, L. Tresse, Stephane Arnouts, Lucia Pozzetti, Yannick Mellier, V. Ripepi, E. Zucca, D. Rizzo, V. LeBrun, S. Paltani, Roberto Scaramella, Stéphane Charlot, G. Mathez, O. LeFevre, R. Merighi, I. Gavignaud, A. Zanichelli, M. Bondi, B. Meneux, D. Bottini, Alain Mazure, G. Vettolani, J. P. Picat, M. Bolzonella, A. Iovino, R. Pello, M. Arnaboldi, G. Busarello, B. Garilli, Marco Scodeggio, C. Adami, L. Gregorini, Mario Radovich, F. Lamareille, P. Franzetti, Paola Merluzzi, O. Ilbert, Bruno Marano, D. Maccagni, H. J. McCracken, Sylvie Foucaud, A. Pollo, S. Bardelli, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Brera (INAF-OAB), INAF-Osservatorio Astronomico di Bologna (OABO), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), INAF-Osservatorio Astronomico di Brera, Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Roma (INAF-OAR), IRA-INAF, Bologna, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), Max-Planck-Institut für Astrophysik (MPA), School of Physics and Astronomy, University of Nottingham, European Southern Observatory (ESO), INTEGRAL Science Data Centre, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Meneux B., Le Fèvre O., Guzzo L., Pollo A., Cappi A., Ilbert O., Iovino A., Marinoni C., McCracken H. J., Bottini D., Garilli B., Le Brun V., Maccagni D., Picat J.P., Scaramella R., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnouts S., Arnaboldi M., Bardelli S., Bolzonella M., Charlot S., Ciliegi P., Contini T., Foucaud S., Franzetti P., Gavignaud I., Marano B., Mazure A., Merighi R., Paltani S., Pello' R., Pozzetti L., Radovich M., Zamorani G., Zucca E., Bondi M., Bongiorno A., Busarello G., Cucciati O., Gregorini L., Lamareille F., Mathez G., Mellier Y., Merluzzi P., Ripepi V., and Rizzo D.
Subjects: Population, Dark matter, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Type (model theory), Stellar classification, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, 10. No inequality, education, Cluster analysis, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, education.field_of_study, 010308 nuclear & particles physics, Star formation, Astrophysics (astro-ph), Astronomy and Astrophysics, Galaxy, Space and Planetary Science, Halo, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: We measure the evolution of clustering for galaxies with different spectral types from 6495 galaxies with 17.51.2, due to the growth in clustering of the star-forming population. We find similar results when splitting the sample into `red' and `blue' galaxies using the observed color bi-modality. When compared to the expected linear growth of mass fluctuations, a natural interpretation of these observations is that: (a) the assembly of massive early type galaxies is already mostly complete in the densest dark matter halos at z~=1; (b) luminous late-type galaxies are located in higher-density, more clustered regions of the Universe at z~=1.5 than at present, indicating that star formation activity is progressively increasing, going back in time, in the higher-density peaks that today are mostly dominated by old galaxies., 12 pages, Accepted on 11-Feb-06 for publication in Astronomy and Astrophysics
Published: 2006
Full Text: View/download PDF

45. Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey

Author: Paolo Ciliegi, G. Busarello, R. Pello, Mario Radovich, A. Pollo, V. Ripepi, A. Iovino, V. Le Brun, O. Ilbert, T. Contini, C. Adami, L. Tresse, S. Bardelli, M. Bondi, Christian Marinoni, O. Le Fevre, D. Vergani, I. Gavignaud, Marco Scodeggio, B. Garilli, D. Maccagni, E. Zucca, D. Rizzo, Stéphane Paltani, Gianpaolo Vettolani, H. J. McCracken, P. Franzetti, Bruno Marano, Alain Mazure, M. Bolzonella, Yannick Mellier, Sylvie Foucaud, Roberto Scaramella, R. Merighi, D. Bottini, A. Cappi, Luigi Guzzo, O. Cucciati, S. de la Torre, L. Gregorini, J. P. Picat, E. Bertin, B. Meneux, G. Mathez, Paola Merluzzi, Angela Bongiorno, Stéphane Charlot, Stephane Arnouts, Lucia Pozzetti, G. Zamorani, F. Lamareille, A. Zanichelli, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Ilbert O., Arnouts S., McCracken H. J., Bolzonella M., Bertin E., Le Fèvre O., Mellier Y., Zamorani G., Pellò R., Iovino A., Tresse L., Le Brun V., Bottini D., Garilli B., Maccagni D., Picat J. P., Scaramella R., Scodeggio M., Vettolani G., Zanichelli A., Adami C., Bardelli S., Cappi A., Charlot S., Ciliegi P., Contini T., Cucciati O., Foucaud S., Franzetti P., Gavignaud I., Guzzo L., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Paltani S., Pollo A., Pozzetti L., Radovich M., Zucca E., Bondi M., Bongiorno A., Busarello G., de La Torre S., Gregorini L., Lamareille F., Mathez G., Merluzzi P., Ripepi V., Rizzo D., Vergani D., Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Bologna (OABO), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), INAF-Osservatorio Astronomico di Brera, Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Milano), INAF-Osservatorio Astronomico di Roma (INAF-OAR), IRA-INAF, Bologna, School of Physics and Astronomy, University of Nottingham, European Southern Observatory (ESO), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), INTEGRAL Science Data Centre, INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC), and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)
Subjects: FOS: Physical sciences, METHODS: DATA ANALYSIS, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Extended Groth Strip, 0103 physical sciences, Calibration, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Photometric redshift, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Sigma, Astronomy and Astrophysics, GALAXIES: PHOTOMETRY, Cosmic variance, Galaxy, Redshift, Cover (topology), 13. Climate action, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], GALAXIES: DISTANCES AND REDSHIFTS
Abstract: We present photometric redshifts for an uniquely large and deep sample of 522286 objects with i'_{AB}, Comment: 19 pages, 17 figures, submitted to A&A. The photometric redshifts described in this paper will be made publicly available from 1st may 2006 at http://terapix.iap.fr and http://cencosw.oamp.fr/
Published: 2006
Full Text: View/download PDF

46. The ATESP 5 GHz Radio Survey I. Source Counts and spectral index properties of the faint radio population

Author: Isabella Prandoni, A. Mignano, Ronald D. Ekers, L. Gregorini, P. Parma, Mark H. Wieringa, Gianpaolo Vettolani, H. R. de Ruiter, Prandoni I., Parma P., Wieringa M.H., de Ruiter H.R., Gregorini L., Mignano A., Vettolani G., and Ekers R.D.
Subjects: Physics, CATALOGS, education.field_of_study, Spectral index, RADIO CONTINUUM: GENERAL, Population, Astrophysics (astro-ph), Flux, FOS: Physical sciences, Astronomy and Astrophysics, METHODS: DATA ANALYSIS, Astrophysics, Flattening, Square degree, law.invention, Telescope, GALAXIES: GENERAL, Space and Planetary Science, law, Source counts, education, Image resolution, SURVEYS
Abstract: [Abridged] The nature and evolutionary properties of the faint radio population, responsible for the steepening observed in the 1.4 GHz source counts below 1 milliJy, are not yet entirely clear. Radio spectral indices may help to constrain the origin of the radio emission in such faint radio sources and may be fundamental in understanding eventual links to the optical light. We study the spectral index behaviour of sources that were found in the 1.4 GHz ATESP survey (Prandoni et al. 2000a,b). Using the Australia Telescope Compact Array we observed at 5 GHz part of the region covered by the sub-mJy ATESP survey. In particular we imaged a one square degree area for which deep optical imaging in UBVRIJK is available. In this paper we present the 5 GHz survey and source catalogue, we derive the 5 GHz source counts and we discuss the 1.4-5 GHz spectral index properties of the ATESP sources. The analysis of the optical properties of the sample will be the subject of a following paper. The 5 GHz survey has produced a catalogue of 111 radio sources, complete down to a (6 sigma) limit S_lim(5 GHz)~0.4 mJy. We take advantage of the better spatial resolution at 5 GHz (~2 arcsec compared to ~8 arcsec at 1.4 GHz) to infer radio source structures and sizes. The 5 GHz source counts derived by the present sample are consistent with those reported in the literature, but improve significantly the statistics in the flux range 0.4< S(5 GHz), 22 pages, 13 figures Accepted for publication on Astronomy and Astrophysics. Replaced version: corrected typos and references updated
Published: 2006

47. The VIMOS-VLT Deep Survey: Luminosity dependence of clustering at z~1

Author: A. Pollo, L. Guzzo, O. Le Fèvre, B. Meneux, A. Cappi, P. Franzetti, A. Iovino, H. J. McCracken, C. Marinoni, G. Zamorani, D. Bottini, B. Garilli, V. Le Brun, D. Maccagni, J. P. Picat, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, M. Bolzonella, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, I. Gavignaud, O. Ilbert, B. Marano, A. Mazure, R. Merighi, S. Paltani, R. Pellò, L. Pozzetti, M. Radovich, E. Zucca, M. Bondi, A. Bongiorno, G. Busarello, O. Cucciati, L. Gregorini, F. Lamareille, G. Mathez, Y. Mellier, P. Merluzzi, V. Ripepi, D. Rizzo, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Pollo A., Guzzo L., Le Fèvre O., Meneux B., Cappi A., Franzetti P., Iovino A., McCracken H. J., Marinoni C., Zamorani G., Bottini D., Garilli B., Le Brun V., Maccagni D., Picat J.P., Scaramella R., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnouts S., Bardelli S., Bolzonella M., Charlot S., Ciliegi P., Contini T., Foucaud S., Gavignaud I., Ilbert O., Marano B., Mazure A., Merighi R., Paltani S., Pello R., Pozzetti L., Radovich M., Zucca E., Bondi M., Bongiorno A., Busarello G., Cucciati P., Gregorini L., Lamareille F., Mathez G., Mellier Y., Merluzzi P., Ripepi V., and Rizzo D.
Subjects: Absolute magnitude, statistical [methods], FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], large scale structure of Universe [cosmology], 0103 physical sciences, Cluster analysis, 010303 astronomy & astrophysics, evolution [galaxies], Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astronomy and Astrophysics, Galaxy, Redshift, observations [cosmology], Correlation function (statistical mechanics), Space and Planetary Science, Halo, VIMOS-VLT Deep Survey
Abstract: We investigate the dependence of galaxy clustering on the galaxy intrinsic luminosity at high redshift, using the data from the First Epoch VIMOS-VLT Deep Survey (VVDS). The size (6530 galaxies) and depth (I_{AB}=0.9 and median absolute magnitude -19.6< M_B < -21.3. Fitting w_p(r_p) with a single power-law model for the real-space correlation function xi(r)=(r/r_0)^{-gamma}, we measure the relationship of the correlation length r_0 and the slope gamma with the sample median luminosity for the first time at such high redshift. Values from our lower-redshift samples (0.1=-19.6) have a correlation length r_0=2.7^{+0.3}_{-0.3} h^{-1} Mpc, compared to r_0=5.0^{+1.5}_{-1.6} h^{-1} Mpc at =-21.3. Correspondingly the slope of the correlation function is observed to steepen significantly from \gamma=1.6^{+0.1}_{-0.1} to \gamma=2.4^{+0.4}_{-0.2}. This is not observed neither by large local surveys nor in our lower-redshift sample and seems to imply a significant change in the way luminous galaxies trace dark-matter halos at z~1 with respect to z~0. At our effective median redshift z~0.9 this corresponds to a strong difference of the relative bias, from b/b* < 0.7 for galaxies with L < L*, to b/b*~1.4 for galaxies with L > L*., Comment: Accepted for publication in Astronomy and Astrophysics
Published: 2006
Full Text: View/download PDF

48. The B3 VLA Sample at Low Frequencies: Results from a survey at 74 MHz

Author: R. T. Schilizzi, W. Tschager, L. Gregorini, I. A. G. Snellen, M. Vigotti, K.-H. Mack, Uli Klein, LOBANOV A.P., ZENZUS J.A., CESARSKY C., DIAMOND P.J., Mack K.-H., Vigotti M., Gregorini L., Klein U., Tschager W., Schilizzi R.T., and Snellen I.A.G.
Subjects: Geography, Observatory, business.industry, Library science, Telecommunications, business, Sample (graphics)
Abstract: 1 Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129 Bologna, Italy 2 Radioastronomisches Institut der Universitat Bonn, Auf dem Hugel 71, D-53121 Bonn, Germany 3 Sterrewacht Leiden, PO Box 9513, NL-2300 RA Leiden, The Netherlands 4 Int. SKA Project Office, Postbus 2, NL-7990 AA Dwingeloo, The Netherlands 5 Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, United Kingdom
Published: 2006

49. A large population of galaxies 9 to 12 billion years back in the history of the Universe

Author: D. Rizzo, C. Adami, M. Bolzonella, Marco Scodeggio, Roberto Scaramella, A. Mazure, Lucia Pozzetti, A. Zanichelli, Paola Merluzzi, E. Zucca, B. Meneux, R. Merighi, Thierry Contini, O. Ilbert, G. Busarello, Christian Marinoni, V. Le Brun, Sylvie Foucaud, I. Gavignaud, G. Vettolani, G. Mathez, V. Ripepi, J. P. Picat, B. Garilli, R. Pello, D. Maccagni, Stephane Charlot, Mario Radovich, G. Zamorani, Stéphane Paltani, Yannick Mellier, M. Arnaboldi, Bruno Marano, A. Iovino, F. Lamareille, A. Cappi, M. Bondi, Luigi Guzzo, Laurence Tresse, A. Pollo, S. Bardelli, D. Bottini, Stéphane Arnouts, Angela Bongiorno, H. J. McCracken, L. Gregorini, P. Franzetti, O. Le Fevre, Paolo Ciliegi, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astrophysik (MPA), Max-Planck-Gesellschaft, INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Le Fèvre O., Paltani S., Arnouts S., Charlot S., Foucaud S., Ilbert O., McCracken H. J., Zamorani G., Bottini D., Garilli B., Le Brun V., Maccagni D., Picat J. P., Scaramella R., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Bardelli S., Bolzonella M., Cappi A., Ciliegi P., Contini T., Franzetti P., Gavignaud I., Guzzo L., Iovino A., Marano B., Marinoni C., Mazure A., Meneux B., Merighi R., Pellò R., Pollo A., Pozzetti L., Radovich M., Zucca E., Arnaboldi M., Bondi, M., Bongiorno A., Busarello G., Gregorini L., Lamareille F., Mathez G., Mellier, Y., Merluzzi P., Ripepi V., Rizzo D., Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: 010504 meteorology & atmospheric sciences, Radio galaxy, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Peculiar galaxy, GALASSIE, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Galaxy formation and evolution, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Galaxy cluster, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, Luminous infrared galaxy, Multidisciplinary, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), Astronomy, Quasar, COSMOLOGIA, Galaxy, Elliptical galaxy
Abstract: To understand the evolution of galaxies, we need to know as accurately as possible how many galaxies were present in the Universe at different epochs. Galaxies in the young Universe have hitherto mainly been identified using their expected optical colours, but this leaves open the possibility that a significant population remains undetected because their colours are the result of a complex mix of stars, gas, dust or active galactic nuclei. Here we report the results of a flux-limited I-band survey of galaxies at look-back times of 9 to 12 billion years. We find 970 galaxies with spectroscopic redshifts between 1.4 and 5. This population is 1.6 to 6.2 times larger than previous estimates, with the difference increasing towards brighter magnitudes. Strong ultraviolet continua (in the rest frame of the galaxies) indicate vigorous star formation rates of more than 10 to 100 solar masses per year. As a consequence, the cosmic star formation rate is higher than previously measured at redshifts of 3 to 4., Comment: Published in Nature, 22 September 2005
Published: 2005
Full Text: View/download PDF

50. The Vimos-VLT Deep Survey: Results from the First-Epoch Observations

Author: R. Pello, Mario Radovich, B. Meneux, Paolo Ciliegi, Vincenzo Ripepi, Stephane Charlot, H. J. McCracken, M. Bondi, Alain Mazure, C. Adami, G. Busarello, E. Zucca, Marco Scodeggio, D. Rizzo, D. Bottini, V. Le Brun, Bruno Marano, B. Garilli, I. Gavignaud, D. Maccagni, O. Ilbert, Yannick Mellier, C. Marinoni, S. Paltani, Roberto Scaramella, L. Tresse, R. Merighi, Sylvie Foucaud, A. Pollo, T. Contini, L. Gregorini, M. Bolzonella, Paola Merluzzi, Angela Bongiorno, G. Vettolani, Luigi Guzzo, P. Franzetti, G. Mathez, Magda Arnaboldi, A. Cappi, S. Bardelli, O. Le Fevre, J. P. Picat, A. Iovino, G. Zamorani, Stephane Arnouts, Lucia Pozzetti, A. Zanichelli, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Yannick Mellier, Georges Meylan, YANNICK MELLIER AND GEORGES MEYLAN, Paltani S., Ilbert O., Le Fèvre O., Marinoni C., Bottini D., Garilli B., Le Brun V., Maccagni D., Picat J.-P., Scaramella R., Scodeggio M., Tresse L., Vettolani G., Zanichelli A., Adami C., Arnaboldi M., Arnouts S., Bardelli S., Bolzonella M., Cappi A., Charlot S., Contini T., Foucaud S., Franzetti P., Gavignaud I., Guzzo L., Iovino A., McCracken H. J., Marano B., Mazure A., Meneux B., Merighi R., Pellò R., Pollo A., Pozzetti L., Radovich M., Zamorani G., Zucca E., Bondi M., Bongiorno A., Busarello G., Ciliegi P., Gregorini L., Mathez G., Mellier Y., Merluzzi P., Ripepi V., Rizzo D, and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)
Subjects: Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astronomy, Astronomy and Astrophysics, Function (mathematics), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Redshift survey, Galaxy, Redshift, Spectral line, Luminosity, Space and Planetary Science, Limiting magnitude, Astrophysics::Galaxy Astrophysics, Luminosity function (astronomy)
Abstract: ISBN 0521851963; The Vimos-VLT Deep Survey is a spectroscopic survey aiming at collecting more than 50000 spectra down to a limiting magnitude IAB=24, and 100000 down to IAB=22.5, on a total of about 16 deg2 without any color or morphology preselection. We present the N(z) distribution up to z~ 5, obtained from a purely magnitude-limited sample down to IAB=24, which is an important input to weak-lensing studies. We discuss the evolution of the galaxy luminosity function up to z~ 2, which exhibits a very strong increase in the typical galaxy luminosity Delta M*&simeq; -2.5 in the U band compared to the local value. Surveys like the VVDS also allow to study the galaxy bias as a function of redshift without assumption about its linearity, an assumption that we find to be violated in some cases. A low bias is found, and the linear bias is shown to increase with redshift.
Published: 2005
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

208 results on '"L. Gregorini"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources