Looking For Obscured QSOs In The X-Ray Emitting ERO Population

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dc.contributor.utaustinauthorDrory, N.en_US
dc.creatorSevergnini, P.en_US
dc.creatorDella Ceca, R.en_US
dc.creatorBraito, V.en_US
dc.creatorSaracco, P.en_US
dc.creatorLonghetti, M.en_US
dc.creatorBender, R.en_US
dc.creatorDrory, N.en_US
dc.creatorFeulner, G.en_US
dc.creatorHopp, U.en_US
dc.creatorMannucci, F.en_US
dc.creatorMaraston, C.en_US
dc.date.accessioned2016-04-22T19:44:26Z
dc.date.available2016-04-22T19:44:26Z
dc.date.issued2005-02en
dc.description.abstractWe present XMM-Newton data centered on one of the MUNICS Near Infrared Cluster Survey fields (S2F1) and we discuss the X-ray properties of the 6 X-ray emitting EROs found. For one of them we have already obtained the redshift using near-infrared spectroscopic data, while for the remaining 5 EROs the analysis is based on photometric redshifts. We find evidence for the presence of an X-ray obscured QSO in at least 5 out of the 6 X-ray emitting EROs. For these 5 objects we derive intrinsic (2-10 keV) luminosities in excess of 10(44) erg s(-1) and intrinsic column densities higher than 10(22) cm(-2). These values have been obtained through a basic X-ray spectral analysis for the three brightest sources and through the analysis of the hardness ratios for the remaining two. All of these 5 X-ray emitting EROs appear extended in the optical/near-infrared bands indicating that the host galaxy emission dominates at these wavelengths. This suggests that the hosted AGNs are likely to be absorbed also in the optical/near-infrared bands: i.e. they are likely X-ray obscured possible type 2 QSOs. For the remaining ERO the presence of an AGN is suggested both by its high 0.5-2 keV luminosity (L0.5-2keV similar to 10(43) erg s(-1)) and by its X-ray-to-optical flux ratio. In this case the quality of the present data prevents us from placing firm constraints on the AGN type hosted. Finally, the near-IR spectrum obtained for one of the 6 EROs classifies the host galaxy as an elliptical at z similar or equal to 1.7 with a stellar mass well in excess of 10(11) M.. This result corroborates the possible link between the QSO activity and the formation of massive spheroids.en_US
dc.description.departmentAstronomyen_US
dc.identifierdoi:10.15781/T2VF6K
dc.identifier.citationSevergnini, P., R. Della Ceca, V. Braito, P. Saracco, M. Longhetti, R. Bender, N. Drory et al. >Looking for obscured QSOs in the X-ray emitting ERO population.> Astronomy & Astrophysics, Vol. 431, No. 1 (Feb., 2005): pp. 87-95.en_US
dc.identifier.doi10.1051/0004-6361:20041587en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34340
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectgalaxies : activeen_US
dc.subjectx-rays : galaxiesen_US
dc.subjectchandra deep-fielden_US
dc.subjectinfrared cluster surveyen_US
dc.subjectextremely red objectsen_US
dc.subjectoptical identificationsen_US
dc.subjectluminosity functionsen_US
dc.subjectserendipitous surveyen_US
dc.subjecthellas2xmm surveyen_US
dc.subjectstar-formationen_US
dc.subjectnorth surveyen_US
dc.subjecttype-2 qsoen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleLooking For Obscured QSOs In The X-Ray Emitting ERO Populationen_US
dc.typeArticleen_US

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