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1. THE 10k zCOSMOS: MORPHOLOGICAL TRANSFORMATION OF GALAXIES IN THE GROUP ENVIRONMENT SINCEz∼1

Author

E. Ricciardelli, A. Cappi, Lucia Pozzetti, Micol Bolzonella, Daniela Vergani, Thierry Contini, C. M. Carollo, Alvio Renzini, Laurence Tresse, Y. Peng, A. Iovino, Luigi Guzzo, Angela Bongiorno, John D. Silverman, V. Mainieri, E. Zucca, J. F. Le Borgne, Alexis Finoguenov, Graziano Coppa, Claudia Scarlata, V. Le Brun, Paolo Cassata, P. Oesch, Anton M. Koekemoer, Mark Sargent, L. de Ravel, F. Lamareille, Lidia Tasca, S. Bardelli, P. Memeo, S. J. Lilly, P. Kampczyk, Bianca Garilli, N. Z. Scoville, C. Knobel, Jean-Paul Kneib, Ummi Abbas, O. Le Fèvre, D. Maccagni, R. Pello, Karina Caputi, D. Bottini, G. Zamorani, H. J. McCracken, M. Scodeggio, P. Franzetti, Olga Cucciati, Alessandro Cimatti, Masayuki Tanaka, B. Meneux, E. Perez Montero, S. de la Torre, M. Mignoli, Christian Maier, Christian Marinoni, M. Fumana, Cristiano Porciani, Alexie Leauthaud, Roberto Scaramella, K. Kovac, AUTRES, Università di Bologna, Dipartimento di Astronomia, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), University of Chicago, Dipartimento di Fisica, Università degli Studi di Milano-Bicocca [Milano] (UNIMIB)-Università degli Studi di Milano [Milano] (UNIMI), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), 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, Institute of Astronomy [ETH Zürich], Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), INAF - Osservatorio Astronomico di Brera (OAB), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, 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'Astrophysique de l'Observatoire Midi-Pyrénées (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), Glycosciences Laboratory, Imperial College School of Medicine, Tokai University, INAF - Osservatorio Astrofisico di Arcetri (OAA), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Space Telescope Science Institute (STSci), 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), 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), California Institute of Technology (CALTECH), K. Kovac, S. J. Lilly, C. Knobel, M.Bolzonella, A. Iovino, C.M. Carollo, C. Scarlata, M. Sargent, O. Cucciati, G. Zamorani, L. Pozzetti, L.A.M. Tasca, M. Scodeggio, P. Kampczyk, Y. Peng, P. Oesch, E. Zucca, A. Finoguenov, T. Contini, J.-P. Kneib, O. Le Fevre, V. Mainieri, A. Renzini, S. Bardelli, A. Bongiorno, K. Caputi, G. Coppa, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, F. Lamareille, J.-F. Le Borgne, V. Le Brun, C. Maier, M. Mignoli, R. Pello, E. Perez Montero, E. Ricciardelli, J.D. Silverman, M. Tanaka, L. Tresse, D. Vergani, U. Abba, D. Bottini, A. Cappi, P. Cassata, A. Cimatti, M. Fumana, L. Guzzo, A.M. Koekemoer, A. Leauthaud, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, C. Porciani, R. Scaramella, N.Z. Scoville, Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB)-Università degli Studi di Milano = University of Milan (UNIMI), 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 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), and Astronomy

Subjects
Galaxies: Structure, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, Stellar mass, Population, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Luminosity, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Galaxies: Evolution, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, education.field_of_study, COSMIC cancer database, Group (mathematics), Star formation, Galaxies: High-redshift, Astronomy and Astrophysics, Redshift survey, Galaxy, Space and Planetary Science, Mass function, Galaxies: Clusters: General, Galaxies: Luminosity function, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We study the evolution of galaxies inside and outside of the group environment since z=1 using a large well defined set of groups and galaxies from the zCOSMOS-bright redshift survey in the COSMOS field. The fraction of galaxies with early-type morphologies increases monotonically with M_B luminosity and stellar mass and with cosmic epoch. It is higher in the groups than elsewhere, especially at later epochs. The emerging environmental effect is superposed on a strong global mass-driven evolution, and at z~0.5 and log(M*/Msol)~10.2, the "effect" of group environment is equivalent to (only) about 0.2 dex in stellar mass or 2 Gyr in time. The stellar mass function of galaxies in groups is enriched in massive galaxies. We directly determine the transformation rates from late to early morphologies, and for transformations involving colour and star formation indicators. The transformation rates are systematically about twice as high in the groups as outside, or up to 3-4 times higher correcting for infall and the appearance of new groups. The rates reach values, for masses around the crossing mass 10^10.5 Msol, as high as (0.3-0.7)/Gyr in the groups, implying transformation timescales of 1.4-3 Gyr, compared with less than 0.2/Gyr, i.e. timescales >5 Gyr, outside of groups. All three transformation rates decrease at higher stellar masses, and must decrease also at the lower masses below 10^10 Msol which we cannot well probe. The rates involving colour and star formation are consistently higher than those for morphology, by a factor of about 50%. Our conclusion is that the transformations which drive the evolution of the overall galaxy population since z~1 must occur at a rate 2-4 times higher in groups than outside of them., 21 pages, 13 figures, submitted to ApJ

Published
2010
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2. The Colors of Central and Satellite Galaxies in zCOSMOS out to z ~ 0.8 and Implications for Quenching

Author

E. Zucca, T. J. Bschorr, J. F. Le Borgne, Daniela Vergani, Andrea Cimatti, Masayuki Tanaka, Christian Maier, Anton M. Koekemoer, P. Kampczyk, Angela Bongiorno, Bianca Garilli, C. López-Sanjuan, Lucia Pozzetti, H. J. McCracken, R. Pello, E. Perez Montero, Graziano Coppa, Niraj Welikala, P. Franzetti, O. Le Fèvre, Olga Cucciati, F. Lamareille, S. de la Torre, Michele Moresco, Simon J. Lilly, Lidia Tasca, C. M. Carollo, S. Bardelli, A. Iovino, V. Presotto, Luke A. Barnes, Laurence Tresse, Karina Caputi, C. Knobel, Gianni Zamorani, L. de Ravel, Alvio Renzini, J. P. Kneib, M. Mignoli, A. Cappi, Preethi Nair, V. Mainieri, M. Bolzonella, John D. Silverman, Rongmon Bordoloi, V. Le Brun, Thierry Contini, Yingjie Peng, K. Kovac, M. Scodeggio, C. Knobel, S. J. Lilly, K. Kovac, Y. Peng, T. J. Bschorr, C. M. Carollo, T. Contini, J.-P. Kneib, O. Le Fevre, V. Mainieri, A. Renzini, M. Scodeggio, G. Zamorani, S. Bardelli, M. Bolzonella, A. Bongiorno, K. Caputi, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, F. Lamareille, J.-F. Le Borgne, V. Le Brun, C. Maier, M. Mignoli, R. Pello', E. Perez Montero, V. Presotto, J. Silverman, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, E. Zucca, L. Barne, R. Bordoloi, A. Cappi, A. Cimatti, G. Coppa, A. M. Koekemoer, C. Lopez-Sanjuan, H. J. McCracken, M. Moresco, P. Nair, L. Pozzetti, N. Welikala, Kapteyn Astronomical Institute, C., Knobel, S. J., Lilly, K., Kovač, Y., Peng, T. J., Bschorr, C. M., Carollo, T., Contini, J. P., Kneib, O., Le Fevre, V., Mainieri, A., Renzini, M., Scodeggio, G., Zamorani, S., Bardelli, M., Bolzonella, A., Bongiorno, K., Caputi, O., Cucciati, S., de la Torre, L., de Ravel, P., Franzetti, B., Garilli, A., Iovino, P., Kampczyk, F., Lamareille, J. F., Le Borgne, V., Le Brun, C., Maier, M., Mignoli, R., Pello, E., Perez Montero, Presotto, Valentina, J., Silverman, M., Tanaka, L., Tasca, L., Tresse, D., Vergani, E., Zucca, L., Barne, R., Bordoloi, A., Cappi, A., Cimatti, G., Coppa, A. M., Koekemoer, C., López Sanjuan, H. J., Mccracken, M., Moresco, P., Nair, L., Pozzetti, and N., Welikala

Subjects
GALAXIES: EVOLUTION, statistics [galaxies], Cosmology and Nongalactic Astrophysics (astro-ph.CO), Stellar mass, media_common.quotation_subject, COSMOLOGY: OBSERVATIONS, GALAXIES: STATISTICS, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, STAR-FORMATION, COSMOS SURVEY, 0103 physical sciences, Satellite galaxy, Astrophysics::Solar and Stellar Astrophysics, GALAXIES: LUMINOSITY FUNCTION, 10. No inequality, 010303 astronomy & astrophysics, RED SEQUENCE, evolution [galaxies], Astrophysics::Galaxy Astrophysics, luminosity function [galaxies], media_common, Physics, Quenching, REDSHIFT SURVEY, MASS FUNCTION, groups: general [galaxies], 010308 nuclear & particles physics, Astronomy and Astrophysics, GROUP CATALOG, cosmology: observations, galaxies: evolution, galaxies: groups: general, galaxies: luminosity function, mass function, galaxies: statistics, Redshift, EVOLUTION, Space and Planetary Science, Sky, galaxies: luminosity function, mass function, SPECTROSCOPIC SAMPLE, Physics::Space Physics, STELLAR MASS FUNCTION, DIGITAL SKY SURVEY, Satellite, QUIESCENT GALAXIES, GALAXIES: GROUPS: GENERAL, Astrophysics - Cosmology and Nongalactic Astrophysics, observation [cosmology]
Abstract

We examine the red fraction of central and satellite galaxies in the large zCOSMOS group catalog out to z ~ 0.8 correcting for both the incompleteness in stellar mass and for the less than perfect purities of the central and satellite samples. We show that, at all masses and at all redshifts, the fraction of satellite galaxies that have been quenched, i.e., are red, is systematically higher than that of centrals, as seen locally in the Sloan Digital Sky Survey (SDSS). The satellite quenching efficiency, which is the probability that a satellite is quenched because it is a satellite rather than a central, is, as locally, independent of stellar mass. Furthermore, the average value is about 0.5, which is also very similar to that seen in the SDSS. We also construct the mass functions of blue and red centrals and satellites and show that these broadly follow the predictions of the Peng et al. analysis of the SDSS groups. Together, these results indicate that the effect of the group environment in quenching satellite galaxies was very similar when the universe was about a half its present age, as it is today., Comment: 11 pages, 6 figures, published in ApJ

Published
2012
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3. Comparison of star formation rates from Hα and infrared luminosity as seen byHerschel

Author

H. Domínguez Sánchez, M. Mignoli, F. Pozzi, F. Calura, A. Cimatti, C. Gruppioni, J. Cepa, M. Sánchez Portal, G. Zamorani, S. Berta, D. Elbaz, E. Le Floc'h, G. L. Granato, D. Lutz, R. Maiolino, F. Matteucci, P. Nair, R. Nordon, L. Pozzetti, L. Silva, J. Silverman, S. Wuyts, C. M. Carollo, T. Contini, J.-P. Kneib, O. Le Fèvre, S. J. Lilly, V. Mainieri, A. Renzini, M. Scodeggio, S. Bardelli, M. Bolzonella, A. Bongiorno, K. Caputi, G. Coppa, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, C. Knobel, K. Kovač, F. Lamareille, J.-F. Le Borgne, V. Le Brun, C. Maier, B. Magnelli, R. Pelló, Y. Peng, E. Perez-Montero, E. Ricciardelli, L. Riguccini, M. Tanaka, L. A. M. Tasca, L. Tresse, D. Vergani, and E. Zucca

Subjects
Physics, Spiral galaxy, 010504 meteorology & atmospheric sciences, Star formation, Metallicity, Extinction (astronomy), Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Redshift, Galaxy, Luminosity, Space and Planetary Science, 0103 physical sciences, Emission spectrum, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract

We empirically test the relation between the SFR(LIR) derived from the infrared luminosity, LIR, and the SFR(Ha) derived from the Ha emission line luminosity using simple conversion relations. We use a sample of 474 galaxies at z = 0.06 - 0.46 with both Ha detection (from 20k zCOSMOS survey) and new far-IR Herschel data (100 and 160 {\mu}m). We derive SFR(Ha) from the Ha extinction corrected emission line luminosity. We find a very clear trend between E(B - V) and LIR that allows to estimate extinction values for each galaxy even if the Ha emission line measurement is not reliable. We calculate the LIR by integrating from 8 up to 1000 {\mu}m the SED that is best fitting our data. We compare SFR(Ha) with the SFR(LIR). We find a very good agreement between the two SFR estimates, with a slope of m = 1.01 \pm 0.03 in the SFR(LIR) vs SFR(Ha) diagram, a normalization constant of a = -0.08 \pm 0.03 and a dispersion of sigma = 0.28 dex.We study the effect of some intrinsic properties of the galaxies in the SFR(LIR)-SFR(Ha) relation, such as the redshift, the mass, the SSFR or the metallicity. The metallicity is the parameter that affects most the SFR comparison. The mean ratio of the two SFR estimators log[SFR(LIR)/SFR(Ha)] varies by approx. 0.6 dex from metal-poor to metal-rich galaxies (8.1 < log(O/H) + 12 < 9.2). This effect is consistent with the prediction of a theoretical model for the dust evolution in spiral galaxies. Considering different morphological types, we find a very good agreement between the two SFR indicators for the Sa, Sb and Sc morphologically classified galaxies, both in slope and normalization. For the Sd, irregular sample (Sd/Irr), the formal best-fit slope becomes much steeper (m = 1.62 \pm 0.43), but it is still consistent with 1 at the 1.5 sigma level, because of the reduced statistics of this sub-sample.

Published
2012
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4. The COSMOS density field: a reconstruction using both weak lensing and galaxy distributions

Author

Graziano Coppa, Jean-Paul Kneib, Alvio Renzini, S. Lilly, O. Le Fèvre, C. M. Carollo, M. Mignoli, C. López-Sanjuan, E. Zucca, A. Iovino, Jeffrey M. Silverman, Niraj Welikala, F. Lamareille, J. F. Le Borgne, Masayuki Tanaka, Angela Bongiorno, A. Koekoemoer, Karina Caputi, S. de la Torre, H. J. McCracken, K. Kovac, P. Kampczyk, Olga Cucciati, Rongmon Bordoloi, Richard Massey, Bianca Garilli, R. Pello, Preethi Nair, P. Franzetti, A. Cappi, Micol Bolzonella, Andrea Cimatti, V. Mainieri, Adam Amara, S. Bardelli, E. Perez Montero, Christian Maier, Luke A. Barnes, C. Knobel, Thierry Contini, G. Zamorani, Michele Moresco, Lidia Tasca, M. Scodeggio, Lucia Pozzetti, Daniela Vergani, V. Presotto, L. de Ravel, Laurence Tresse, Y. Peng, V. Le Brun, and Jason Rhodes

Subjects
Physics, 010308 nuclear & particles physics, Dark matter, Gaussian blur, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Redshift, Galaxy, symbols.namesake, Space and Planetary Science, 0103 physical sciences, symbols, Entropy (information theory), 010303 astronomy & astrophysics, Scaling, Weak gravitational lensing, Smoothing
Abstract

The COSMOS field has been the subject of a wide range of observations, with a number of studies focusing on reconstructing the 3D dark matter density field. Typically, these studies have focused on one given method or tracer. In this paper, we reconstruct the distribution of mass in the COSMOS field out to a redshift z=1 by combining Hubble Space Telescope weak lensing measurements with zCOSMOS spectroscopic measurements of galaxy clustering. The distribution of galaxies traces the distribution of mass with high resolution (particularly in redshift, which is not possible with lensing), and the lensing data empirically calibrates the mass normalisation (bypassing the need for theoretical models). Two steps are needed to convert a galaxy survey into a density field. The first step is to create a smooth field from the galaxy positions, which is a point field. We investigate four possible methods for this: (i) Gaussian smoothing, (ii) convolution with truncated isothermal sphere, (iii) fifth nearest neighbour smoothing and (iv) a muliti-scale entropy method. The second step is to rescale this density field using a bias prescription. We calculate the optimal bias scaling for each method by comparing predictions from the smoothed density field with the measured weak lensing data, on a galaxy-by-galaxy basis. In general, we find scale-independent bias for all the smoothing schemes, to a precision of 10%. For the nearest neighbour smoothing case, we find the bias to be 2.51\pm 0.25. We also find evidence for a strongly evolving bias, increasing by a factor of ~3.5 between redshifts 0

Published
2012
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5. The zCOSMOS redshift survey : evolution of the light in bulges and discs since z ~ 0.8

Author

Luis C. Ho, O. Le Fevre, H. J. McCracken, P. Franzetti, Anton M. Koekemoer, R. Pello, E. Zucca, A. Cappi, A. Cattaneo, Niraj Welikala, A. Iovino, K. Kovavc, Alvio Renzini, J. F. Le Borgne, R. M. Rich, M. Mignoli, B. Garilli, T. Contini, Yoshiaki Taniguchi, Graziano Coppa, Jean-Paul Kneib, Masaomi Tanaka, C. Lopez-Sanjuan, E. Perez Montero, P. Kampczyk, Vincenzo Mainieri, Andrea Cimatti, F. Lamareille, Richard Massey, Marco Scodeggio, Angela Bongiorno, Rongmon Bordoloi, Y. Peng, L. Tresse, L. A. M. Tasca, C. Knobel, S. Bardelli, Duncan Farrah, Kartik Sheth, Christian Maier, D. Vergani, Michele Moresco, O. Cucciati, S. de la Torre, K. Caputi, C. M. Carollo, M. Bolzonella, Lucia Pozzetti, G. Zamorani, C. T. Liu, D. B. Sanders, Simon J. Lilly, Luigi Guzzo, V. Le Brun, O. Ilbert, Astronomy, Tasca, L.A.M., Tresse, L., Le Fèvre, O., Ilbert, O., Lilly, S.J., Zamorani, G., López-Sanjuan, C., Ho, L.C., Bardelli, S., Cattaneo, A., Cucciati, O., Farrah, D., Iovino, A., Koekemoer, A.M., Liu, C.T., Massey, R., Renzini, A., Taniguchi, Y., Welikala, N., Zucca, E., Carollo, C.M., Contini, T., Kneib, J.-P., Mainieri, V., Scodeggio, M., Bolzonella, M., Bongiorno, A., Caputi, K., De La Torre, S., Franzetti, P., Garilli, B., Guzzo, L., Kampczyk, P., Knobel, C., Kovač, K., Lamareille, F., Le Borgne, J.-F., Le Brun, V., Maier, C., Mignoli, M., Pello, R., Peng, Y., Perez Montero, E., Rich, R.M., Tanaka, M., Vergani, D., Bordoloi, R., Cappi, A., Cimatti, A., Coppa, G., Mccracken, H.J., Moresco, M., Pozzetti, L., Sanders, D., and Sheth, K.

Subjects
Galaxies: fundamental parameter, FORMING GALAXY, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, MASS, fundamental parameters. [Galaxies], LUMINOSITY FUNCTIONS, galaxies: bulges, STAR-FORMATION RATE, Luminosity, ADVANCED CAMERA, bulges [Galaxies], Bulge, distances and redshifts [Galaxies], Galaxies: distances and redshift, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, Physics, FORMATION HISTORY, Star formation, Astronomy and Astrophysics, galaxies: fundamental parameters, HUBBLE-SPACE-TELESCOPE, VLT DEEP SURVEY, Astronomy and Astrophysic, Redshift survey, evolution [Galaxies], Astrophysics - Astrophysics of Galaxies, luminosity function [Galaxies], Redshift, Galaxy, Stars, galaxies: luminosity function, Space and Planetary Science, mass function, Astrophysics of Galaxies (astro-ph.GA), galaxies: luminosity function, mass function, Astrophysics::Earth and Planetary Astrophysics, GALAXY FORMATION, galaxies: distances and redshifts, Irregular galaxy, galaxies: evolution, Galaxies: bulge, SURVEY COSMOS
Abstract

We studied the chronology of galactic bulge and disc formation by analysing the relative contributions of these components to the B-band rest-frame luminosity density at different epochs. We present the first estimate of the evolution of the fraction of rest-frame B-band light in galactic bulges and discs since redshift z~0.8. We performed a bulge-to-disc decomposition of HST/ACS images of 3266 galaxies in the zCOSMOS-bright survey with spectroscopic redshifts in the range 0.7 < z < 0.9. We find that the fraction of B-band light in bulges and discs is $(26 \pm 4)%$ and $(74 \pm 4)%$, respectively. When compared with rest-frame B-band measurements of galaxies in the local Universe in the same mass range ($10^{9} M_{\odot}\lessapprox M \lessapprox 10^{11.5} M_{\odot}$), we find that the B-band light in discs decreases by ~30% from z~0.7-0.9 to z~0, while the light from the bulge increases by ~30% over the same period of time. We interpret this evolution as the consequence of star formation and mass assembly processes, as well as morphological transformation, which gradually shift stars formed at half the age of the Universe from star-forming late-type/irregular galaxies toearlier types and ultimately into spheroids., Letter to the Editor, 4 pages, 2 figures, accepted for publication in Astronomy and Astrophysics

Published
2014

6. Ionization structure and chemical abundances of the Wolf-Rayet nebula NGC6888 with integral field spectroscopy

Author

E. Perez Montero, D. Martín-Gordón, José M. Vílchez, A. Fernández-Martín, Sebastián F. Sánchez, and Angels Riera

Subjects
Physics, Electron density, Nebula, Extinction (astronomy), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics - Astrophysics of Galaxies, Interstellar medium, Radial velocity, Wolf–Rayet star, Space and Planetary Science, Ionization, Astrophysics of Galaxies (astro-ph.GA), Electron temperature, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

This work aims to search for the observational footprints of the interactions between the interstellar medium (ISM) and stellar winds in the Wolf-Rayet (WR) nebula NGC6888 in order to understand its ionization structure, chemical composition, and kinematics. We have collected a set of integral field spectroscopy observations across NGC6888, obtained with PPAK in the optical range performing both 2D and 1D analyses. Attending to the 2D analysis in the northeast part of NGC6888, we have generated maps of the extinction structure and electron density. We produced statistical frequency distributions of the radial velocity and diagnostic diagrams. We have found that the spectra of a localized region to the southwest of this pointing can be represented well by shock models. Furthermore, we performed a thorough study of integrated spectra in nine regions over the whole nebula. We derived electron densities ranging from, Accepted for publication in Section 6. of Astronomy and Astrophysics. The official date of acceptance is 22/02/2012. 18 pages, 15 figures and 4 tables

Published
2012
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7. X-ray groups of galaxies at 0.5 < z < 1 in zCOSMOS: Increased AGN activities in high redshift groups

Author

Masayuki Tanaka, Marco Scodeggio, P. Nair, John D. Silverman, Pascal Oesch, Angela Bongiorno, Alexis Finoguenov, E. Perez Montero, Graziano Coppa, A. Iovino, Niraj Welikala, E. Zucca, O. Cucciati, Vincenzo Mainieri, S. de la Torre, S. J. Lilly, L. de Ravel, O. Le Fevre, Jean-Paul Kneib, C. M. Carollo, Anton M. Koekemoer, J. F. Le Borgne, Michele Moresco, P. Kampczyk, M. Bolzonella, Lucia Pozzetti, Y. Peng, T. Contini, Katarina Kovac, Alvio Renzini, R. Pello, P. Franzetti, V. Le Brun, Andrea Cimatti, M. Mignoli, Karina Caputi, Rongmon Bordoloi, S. Bardelli, A. Cappi, L. A. M. Tasca, B. Garilli, L. Tresse, C. Knobel, V. Presotto, C. Lopez-Sanjuan, F. Lamareille, Luke A. Barnes, Christian Maier, G. Zamorani, H. J. McCracken, D. Vergani, Astronomy, 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), Tanaka Masayuki, Finoguenov Alexi, Lilly Simon J., Bolzonella Micol, Carollo C. Marcella, Contini Thierry, Iovino Angela, Kneib Jean-Paul, Lamareille Fabrice, Le Fevre Olivier, Mainieri Vincenzo, Presotto Valentina, Renzini Alvio, Scodeggio Marco, Silverman John D., Zamorani Gianni, Bardelli Sandro, Bongiorno Angela, Caputi Karina, Cucciati Olga, de la Torre Sylvain, de Ravel Loic, Franzetti Paolo, Garilli Bianca, Kampczyk Pawel, Knobel Christian, Kovac Katarina, Le Borgne Jean-Francoi, Le Brun Vincent, López-Sanjuan Carlo, Maier Christian, Mignoli Marco, Pello Roser, Peng Yingjie, Perez-Montero Enrique, Tasca Lidia, Tresse Laurence, Vergani Daniela, Zucca Elena, Barnes Luke, Bordoloi Rongmon, Cappi Alberto, Cimatti Andrea, Coppa Graziano, Koekemoer Anton M., McCracken Henry J., Moresco Michele, Nair Preethi, Oesch Pascal, Pozzetti Lucia, and Welikala Niraj

Subjects
Active galactic nucleus, 010504 meteorology & atmospheric sciences, Stellar population, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Astrophysical investigations, Photometry (optics), surveys, 0103 physical sciences, LARGE-SCALE STRUCTURE, COLOR-MAGNITUDE RELATION, Astrophysics::Solar and Stellar Astrophysics, [INFO]Computer Science [cs], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, STAR-FORMATION HISTORIES, Physics, EVOLUTION SURVEY COSMOS, Group membership, Star formation, Astronomy and Astrophysics, galaxies: fundamental parameters, BAND OPTICAL-PROPERTIES, Galaxy, Redshift, PANORAMIC H-ALPHA, RED-SEQUENCE GALAXIES, Space and Planetary Science, galaxies: clusters: general, DIGITAL SKY SURVEY, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], galaxies: evolution, MORPHOLOGY-DENSITY RELATION, Astrophysics - Cosmology and Nongalactic Astrophysics, WIDE-FIELD SURVEY
Abstract

We present a photometric and spectroscopic study of galaxies at 0.5, Comment: 11 pages, 7 figures, accepted for publication in PASJ

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