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108 results on '"Ubertini P"'

6. Restarting activity in the nucleus of PBC J2333.9-2343

Author

Hernández-García, L., primary, Panessa, F., additional, Giroletti, M., additional, Ghisellini, G., additional, Bassani, L., additional, Masetti, N., additional, Pović, M., additional, Bazzano, A., additional, Ubertini, P., additional, Malizia, A., additional, and Chavushyan, V., additional

Published
2017
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7. INTEGRAL IBIS, SPI, and JEM-X observations of LVT151012

Author

Savchenko, V., primary, Bazzano, A., additional, Bozzo, E., additional, Brandt, S., additional, Chenevez, J., additional, Courvoisier, T. J.-L., additional, Diehl, R., additional, Ferrigno, C., additional, Hanlon, L., additional, von Kienlin, A., additional, Kuulkers, E., additional, Laurent, P., additional, Lebrun, F., additional, Lutovinov, A., additional, Martin-Carrillo, A., additional, Mereghetti, S., additional, Natalucci, L., additional, Roques, J. P., additional, Siegert, T., additional, Sunyaev, R., additional, and Ubertini, P., additional

Published
2017
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8. The nature of 50 PalermoSwift-BAT hard X-ray objects through optical spectroscopy

Author

Rojas, A. F., primary, Masetti, N., additional, Minniti, D., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Hau, G., additional, McBride, V. A., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Galaz, G., additional, Gavignaud, I., additional, Landi, R., additional, Malizia, A., additional, Morelli, L., additional, Palazzi, E., additional, Patiño-Álvarez, V., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2017
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9. Chandra and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934

Author

Paizis, A., Nowak, M. A., Wilms, J., Courvoisier, T. J-L., Rodriguez, J., Ubertini, P., and Ebisawa, Ken

Subjects
Physics, Millisecond, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Corona, Spectral line, Neutron star, Pulsar, Space and Planetary Science, Millisecond pulsar, Spectroscopy, QB, Line (formation)
Abstract

We report on an observation of the recently discovered accreting millisecond X-ray pulsar IGR J00291+5934 performed with the RXTE-Proportional Counter Array (PCA) and Chandra-High Energy Transmission Grating Spectrometer (HETGS). The RXTE data are from a two week follow-up of the source while the Chandra observation took place around the end of the follow-up, about 12 days after the discovery of the source, when the source flux had decreased already by a factor of ten. The analysis of the Chandra data allowed us to extract the most precise X-ray position of IGR J00291+5934, RA=00 29 03.08 and Dec=+59 34 19.2 (0.6sec error), compatible with the optical and radio ones. We find that the spectra of IGR J00291+5934 can be described by a combination of a thermal component and a power-law. Along the outburst detected by PCA, the power-law photon index shows no particular trend while the thermal component (~1 keV, interpreted as a hot spot on the neutron star surface) becomes weaker until non-detection. In the simultaneous observation of the weak Chandra/RXTE spectrum, there is no more indication for the ~1 keV thermal component while we detect a colder thermal component (~0.4 keV) that we interpret as the emission from the cold disc. A hint for a 6.4 keV iron line is detected, together with an excess around 6.8 keV and absorption feature around 7.1 keV. The latter two features have never been detected in the spectra of accretion-driven millisecond pulsars before and, if confirmed, would suggest the presence of an expanding hot corona with high outflow velocities., Comment: 8 pages, 5 figures, accepted for publication in A&A

Published
2005

10. Discovery of the X-ray burster SAX J1752.3-3138

Author

Ubertini, P., Heise, J., Zand, J., Cornelisse, R., Kuulkers, E., Natalucci, L., Bazzano, A., and Cocchi, M.

Subjects
Physics, binaries: close, X-ray burster, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Accretion (astrophysics), On board, Neutron star, Bursting, stars: neutron, indi, Space and Planetary Science, Sky, Bulge, Position error, X-rays: bursts, Astrophysics::Galaxy Astrophysics, media_common
Abstract

During a 50 ks monitoring observation of the Galactic bulge performed in September 1999 by the Wide Field Cameras on board the BeppoSAX satellite, an X-ray burst was detected from a sky position ~3 degrees off the Galactic centre. No previously known X-ray sources are located within the position error circle of the observed burst. The new burster, SAX J1752.3-3138, did not show any persistent emission during the whole observation. No other bursting events, as well as steady emission, were reported so far by other instruments or detected in the WFC archive, which covers ~6 Ms and ~4 Ms for burst and persistent luminosity detection, respectively, starting from August 1996. Unless the source is a very weak transient, this could indicate SAX J1752.3-3138 is an atypical burster, a member of a possibly new class of sources characterised by very low steady luminosities and accretion rates (L_x < 10^35 erg/s) and extremely rare bursting activity. The characteristics of the detected burst are consistent with a type I event, identifying the source as a weakly magnetised neutron star in a low-mass X-ray binary system. Evidence for photospheric radius expansion due to Eddington-limited burst luminosity allows to estimate the distance to the source (~9 kpc)., A&A Letters, in press 5 pages, 2 figures

Published
2001
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11. Looking for blazars in a sample of unidentified high-energy emittingFermisources

Author

Marchesini, E. J., primary, Masetti, N., additional, Chavushyan, V., additional, Cellone, S. A., additional, Andruchow, I., additional, Bassani, L., additional, Bazzano, A., additional, Jiménez-Bailón, E., additional, Landi, R., additional, Malizia, A., additional, Palazzi, E., additional, Patiño-Álvarez, V., additional, Rodríguez-Castillo, G. A., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2016
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13. Discovery of the INTEGRAL X/ -ray transient IGR J00291+5934: A Comptonised accreting ms pulsar?

Author

Shaw, S. E., Mowlavi, N., Rodriguez, J., Ubertini, P., Capitanio, F., 海老澤, 研, Eckert, D., Courvoisier, T. J.-L., Produit, N., Walter, R., Falanga, M., Ebisawa, Ken, Shaw, S. E., Mowlavi, N., Rodriguez, J., Ubertini, P., Capitanio, F., 海老澤, 研, Eckert, D., Courvoisier, T. J.-L., Produit, N., Walter, R., Falanga, M., and Ebisawa, Ken

Abstract

著者人数：11名, Accepted: 2005-01-23

Published
2015

15. The nature of 50 Palermo Swift-BAT hard X-ray objects through optical spectroscopy.

Author

Rojas, A. F., Masetti, N., Minniti, D., Jiménez-Bailón, E., Chavushyan, V., Hau, G., McBride, V. A., Bassani, L., Bazzano, A., Bird, A. J., Galaz, G., Gavignaud, I., Landi, R., Malizia, A., Morelli, L., Palazzi, E., Patiño-Álvarez, V., Stephen, J. B., and Ubertini, P.

Subjects
SEYFERT galaxies, HARD X-rays, OPTICAL spectroscopy, LOW mass stars, ACTIVE galactic nuclei, NATURE
Abstract

We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as of unidentified nature in the 54-month Palermo BAT catalogue. In detail, 45 sources in our sample are identified as active galactic nuclei of which, 27 are classified as type 1 (with broad and narrow emission lines) and 18 are classified as type 2 (with only narrow emission lines). Among the broad-line emission objects, one is a type 1 high-redshift quasistellar object, and among the narrow-line emission objects, one is a starburst galaxy, one is a X-ray bright optically normal galaxy, and one is a low ionization nuclear emission line region. We report 30 new redshift measurements, 13 confirmations and 2 more accurate redshift values. The remaining five objects are galactic sources: three are Cataclismic Variables, one is a X-ray Binary probably with a low mass secondary star, and one is an active star. [ABSTRACT FROM AUTHOR]

Published
2017
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16. An active state of the BL Lacertae object Markarian 421 detected by INTEGRAL in April 2013

Author

Pian, E., primary, Türler, M., additional, Fiocchi, M., additional, Boissay, R., additional, Bazzano, A., additional, Foschini, L., additional, Tavecchio, F., additional, Bianchin, V., additional, Castignani, G., additional, Ferrigno, C., additional, Raiteri, C. M., additional, Villata, M., additional, Beckmann, V., additional, D’Ammando, F., additional, Hudec, R., additional, Malaguti, G., additional, Maraschi, L., additional, Pursimo, T., additional, Romano, P., additional, Soldi, S., additional, Stamerra, A., additional, Treves, A., additional, Ubertini, P., additional, Vercellone, S., additional, and Walter, R., additional

Published
2014
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19. Accurate classification of 75 counterparts of objects detected in the 54-month PalermoSwift/BAT hard X-ray catalogue

Author

Parisi, P., primary, Masetti, N., additional, Rojas, A. F., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Palazzi, E., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Galaz, G., additional, Minniti, D., additional, Morelli, L., additional, and Ubertini, P., additional

Published
2014
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20. BL Lacertae identifications in a ROSAT-selected sample ofFermiunidentified objects

Author

Masetti, N., primary, Sbarufatti, B., additional, Parisi, P., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Vogt, F. P. A., additional, Sguera, V., additional, Stephen, J. B., additional, Palazzi, E., additional, Bassani, L., additional, Bazzano, A., additional, Fiocchi, M., additional, Galaz, G., additional, Landi, R., additional, Malizia, A., additional, Minniti, D., additional, Morelli, L., additional, and Ubertini, P., additional

Published
2013
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21. Unveiling the nature of INTEGRAL objects through optical spectroscopy

Author

Masetti, N., primary, Parisi, P., additional, Palazzi, E., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, McBride, V., additional, Rojas, A. F., additional, Steward, L., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Charles, P. A., additional, Galaz, G., additional, Landi, R., additional, Malizia, A., additional, Mason, E., additional, Minniti, D., additional, Morelli, L., additional, Schiavone, F., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2013
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22. INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth

Author

Russian Academy of Sciences, Istituto Nazionale di Astrofisica, Ministerio de Educación y Ciencia (España), Agenzia Spaziale Italiana, Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., Winkler, C., Parmar, A., Bazzano, A., Falanga, Maurizio, Gros, A., Lebrun, F., Natalucci, L., Ubertini, P., Roques, J. P., Bouchet, L., Jourdain, E., Knödlseder, J., Diehl, R., Budtz-Jørgensen, C., Brandt, S., Lund, M. N., Westergaard, N. J., Neronov, A., Türler, M., Chernyakova, M., Walter, Malcolm R., Produit, N., Mowlavi, N., Mas-Hesse, J. Miguel, Domingo-Garau, Albert, Gehrels, N., Kuulkers, E., Kretschmar, Peter, Schmidt, M., Russian Academy of Sciences, Istituto Nazionale di Astrofisica, Ministerio de Educación y Ciencia (España), Agenzia Spaziale Italiana, Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., Winkler, C., Parmar, A., Bazzano, A., Falanga, Maurizio, Gros, A., Lebrun, F., Natalucci, L., Ubertini, P., Roques, J. P., Bouchet, L., Jourdain, E., Knödlseder, J., Diehl, R., Budtz-Jørgensen, C., Brandt, S., Lund, M. N., Westergaard, N. J., Neronov, A., Türler, M., Chernyakova, M., Walter, Malcolm R., Produit, N., Mowlavi, N., Mas-Hesse, J. Miguel, Domingo-Garau, Albert, Gehrels, N., Kuulkers, E., Kretschmar, Peter, and Schmidt, M.

Abstract

[Aims] We study the spectrum of the cosmic X-ray background (CXB) in energy range ~ 5-100 keV., [Methods] Early in 2006 the INTEGRAL observatory performed a series of four 30 ks observations with the Earth disk crossing the field of view of the instruments. The modulation of the aperture flux due to occultation of extragalactic objects by the Earth disk was used to obtain the spectrum of the Cosmic X-ray Background (CXB). Various sources of contamination were evaluated, including compact sources, Galactic Ridge emission, CXB reflection by the Earth atmosphere, cosmic ray induced emission by the Earth atmosphere and the Earth auroral emission., [Results] The spectrum of the cosmic X-ray background in the energy band 5-100 keV is obtained. The shape of the spectrum is consistent with that obtained previously by the HEAO-1 observatory, while the normalization is ~10% higher. This difference in normalization can (at least partly) be traced to the different assumptions on the absolute flux from the Crab Nebulae. The increase relative to the earlier adopted value of the absolute flux of the CXB near the energy of maximum luminosity (20-50 keV) has direct implications for the energy release of supermassive black holes in the Universe and their growth at the epoch of the CXB origin.

Published
2007

23. Looking for blazars in a sample of unidentified high-energy emitting Fermi sources.

Author

Cellone, S. A., Andruchow, I., Marchesini, E. J., Rodríguez-Castillo, G. A., Masetti, N., Chavushyan, V., Patiño-Álvarez, V., Bassani, L., Landi, R., Malizia, A., Palazzi, E., Stephen, J. B., Bazzano, A., Ubertini, P., and Jiménez-Bailón, E.

Subjects
GAMMA ray measurement, FERMI energy, BL Lacertae objects, ASTRONOMICAL catalogs, GALACTIC redshift, LUMINOSITY, BLACK holes
Abstract

Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astronómico Nacional San Pedro Mártir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar. [ABSTRACT FROM AUTHOR]

Published
2016
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24. Accurate classification of 29 objects detected in the 39 month PalermoSwift/BAT hard X-ray catalogue

Author

Parisi, P., primary, Masetti, N., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Palazzi, E., additional, Landi, R., additional, Malizia, A., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Charles, P. A., additional, Galaz, G., additional, Mason, E., additional, McBride, V. A., additional, Minniti, D., additional, Morelli, L., additional, Schiavone, F., additional, and Ubertini, P., additional

Published
2012
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26. Unveiling the nature of INTEGRAL objects through optical spectroscopy

Author

Masetti, N., primary, Parisi, P., additional, Jiménez-Bailón, E., additional, Palazzi, E., additional, Chavushyan, V., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Dean, A. J., additional, Galaz, G., additional, Landi, R., additional, Malizia, A., additional, Minniti, D., additional, Morelli, L., additional, Schiavone, F., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2012
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27. INTEGRAL observations of the GeV blazar PKS 1502+106 and the hard X-ray bright Seyfert galaxy Mkn 841

Author

Pian, E., primary, Ubertini, P., additional, Bazzano, A., additional, Beckmann, V., additional, Eckert, D., additional, Ghisellini, G., additional, Pursimo, T., additional, Tagliaferri, G., additional, Tavecchio, F., additional, Türler, M., additional, Bianchi, S., additional, Bianchin, V., additional, Hudec, R., additional, Maraschi, L., additional, Raiteri, C. M., additional, Soldi, S., additional, Treves, A., additional, and Villata, M., additional

Published
2011
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28. Unveiling the nature ofINTEGRALobjects through optical spectroscopy

Author

Masetti, N., primary, Parisi, P., additional, Palazzi, E., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Dean, A. J., additional, Charles, P. A., additional, Galaz, G., additional, Landi, R., additional, Malizia, A., additional, Mason, E., additional, McBride, V. A., additional, Minniti, D., additional, Morelli, L., additional, Schiavone, F., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2010
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29. Accurate classification of 17 AGNs detected with Swift/BAT

Author

Parisi, P., primary, Masetti, N., additional, Jiménez-Bailón, E., additional, Chavushyan, V., additional, Malizia, A., additional, Landi, R., additional, Molina, M., additional, Fiocchi, M., additional, Palazzi, E., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Dean, A. J., additional, Galaz, G., additional, Mason, E., additional, Minniti, D., additional, Morelli, L., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2009
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30. Unveiling the nature of INTEGRAL objects through optical spectroscopy

Author

Masetti, N., primary, Parisi, P., additional, Palazzi, E., additional, Jiménez-Bailón, E., additional, Morelli, L., additional, Chavushyan, V., additional, Mason, E., additional, McBride, V. A., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Dean, A. J., additional, Galaz, G., additional, Gehrels, N., additional, Landi, R., additional, Malizia, A., additional, Minniti, D., additional, Schiavone, F., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2008
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34. An X-ray view of absorbedINTEGRALAGN

Author

De Rosa, A., primary, Bassani, L., additional, Ubertini, P., additional, Panessa, F., additional, Malizia, A., additional, Dean, A. J., additional, and Walter, R., additional

Published
2008
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35. Unveiling the nature ofINTEGRALobjects through optical spectroscopy

Author

Masetti, N., primary, Mason, E., additional, Morelli, L., additional, Cellone, S. A., additional, McBride, V. A., additional, Palazzi, E., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Charles, P. A., additional, Dean, A. J., additional, Galaz, G., additional, Gehrels, N., additional, Landi, R., additional, Malizia, A., additional, Minniti, D., additional, Panessa, F., additional, Romero, G. E., additional, Stephen, J. B., additional, Ubertini, P., additional, and Walter, R., additional

Published
2008
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36. High-redshift blazar identification for Swift J1656.3-3302

Author

Masetti, N., primary, Mason, E., additional, Landi, R., additional, Giommi, P., additional, Bassani, L., additional, Malizia, A., additional, Bird, A. J., additional, Bazzano, A., additional, Dean, A. J., additional, Gehrels, N., additional, Palazzi, E., additional, and Ubertini, P., additional

Published
2008
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38. IGR J16194–2810: a new symbiotic X-ray binary

Author

Masetti, N., primary, Landi, R., additional, Pretorius, M. L., additional, Sguera, V., additional, Bird, A. J., additional, Perri, M., additional, Charles, P. A., additional, Kennea, J. A., additional, Malizia, A., additional, and Ubertini, P., additional

Published
2007
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42. INTEGRAL observations of the cosmic X-ray background in the 5–100 keV range via occultation by the Earth

Author

Churazov, E., primary, Sunyaev, R., additional, Revnivtsev, M., additional, Sazonov, S., additional, Molkov, S., additional, Grebenev, S., additional, Winkler, C., additional, Parmar, A., additional, Bazzano, A., additional, Falanga, M., additional, Gros, A., additional, Lebrun, F., additional, Natalucci, L., additional, Ubertini, P., additional, Roques, J.-P., additional, Bouchet, L., additional, Jourdain, E., additional, Knödlseder, J., additional, Diehl, R., additional, Budtz-Jorgensen, C., additional, Brandt, S., additional, Lund, N., additional, Westergaard, N. J., additional, Neronov, A., additional, Türler, M., additional, Chernyakova, M., additional, Walter, R., additional, Produit, N., additional, Mowlavi, N., additional, Mas-Hesse, J. M., additional, Domingo, A., additional, Gehrels, N., additional, Kuulkers, E., additional, Kretschmar, P., additional, and Schmidt, M., additional

Published
2007
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43. Swift/XRT counterparts to unassociated Fermi high-energy LAT sources.

Author

Landi, R., Bassani, L., Stephen, J. B., Masetti, N., Malizia, A., and Ubertini, P.

Subjects
FERMI energy, X-ray telescopes, X-rays, BL Lacertae objects, GAMMA rays
Abstract

We report the results from our analysis of a large set of archival data acquired with the X-ray telescope (XRT) onboard Swift, covering the sky region surrounding objects from the first Fermi Large Area Telescope (LAT) catalogue of high-energy sources (1FHL), which still lack an association. Of the 23 regions analysed, 10 did not show any evidence of X-ray emission, but 13 were characterised by the presence of one or more objects emitting in the 0.3-10 keV band. Only in a couple of cases is the X-ray counterpart located outside the Fermi positional uncertainty, while in all other cases the associations found are compatible with the high-energy error ellipses. All counterparts we found have been studied in detail by means of a multi-waveband approach to evaluate their nature or class; in most cases, we have been able to propose a likely or possible association except for one Fermi source whose nature remains doubtful at the moment. The majority of the likely associations are extragalactic in nature, most probably blazars of the BL Lac type. [ABSTRACT FROM AUTHOR]

Published
2015
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45. Unveiling the nature of INTEGRAL objects through optical spectroscopy

Author

Masetti, N., primary, Morelli, L., additional, Palazzi, E., additional, Galaz, G., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Dean, A. J., additional, Israel, G. L., additional, Landi, R., additional, Malizia, A., additional, Minniti, D., additional, Schiavone, F., additional, Stephen, J. B., additional, Ubertini, P., additional, and Walter, R., additional

Published
2006
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48. Unveiling the nature ofINTEGRALobjects through optical spectroscopy

Author

Masetti, N., primary, Pretorius, M. L., additional, Palazzi, E., additional, Bassani, L., additional, Bazzano, A., additional, Bird, A. J., additional, Charles, P. A., additional, Dean, A. J., additional, Malizia, A., additional, Nkundabakura, P., additional, Stephen, J. B., additional, and Ubertini, P., additional

Published
2006
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