Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS spectroscopy
Date Issued
2018
Author(s)
•
•
Husemann, Bernd
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BIANCHI, STEFANO
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Bogdanović, Tamara
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•
Herrero-Illana, Rubén
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Komossa, S.
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Kun, Emma
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Loiseau, Nora
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Paragi, Zsolt
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Perez-Torres, Miguel
•
Description
The authors would like to thank the referee forher/hisconstructivecommentsandsuggestions.The authors, members of the MAGNA project(http://www.issibern.ch/teams/agnactivity/Home.html),gratefully acknowledge support of the International Space ScienceInstitute (ISSI), Bern, Switzerland, and the hospitality of theLorentz Center for international workshops, where one portion ofthis work was carried out. The Italian authors acknowledge financialcontribution from the agreement ASI-INAF n.2017-14-H.O. CVacknowledges financial support from the Italian Space Agencyunder the contract ASI-INAF I/037/12/0. We thank the hospitalityof ESA-ESTEC where part of this work has been carried out,BH is grateful for financial support from the ESA-ESTEC visitorprogram.Funding for SDSS-III has been provided by the Alfred P. SloanFoundation, the Participating Institutions, the National ScienceFoundation, and the U.S. Department of Energy Office of Science.The SDSS-III web site is http://www.sdss3.org/. SDSS-III ismanaged by the Astrophysical Research Consortium for theParticipating Institutions of the SDSS-III Collaboration includingthe University of Arizona, the Brazilian Participation Group,Brookhaven National Laboratory, Carnegie Mellon University,University of Florida, the French Participation Group, the GermanParticipation Group, Harvard University, the Instituto de Astrofisicade Canarias, the Michigan State/Notre Dame/JINA ParticipationGroup, Johns Hopkins University, Lawrence Berkeley NationalLaboratory, Max Planck Institute for Astrophysics, Max PlanckInstitute for Extraterrestrial Physics, New Mexico State University,New York University, Ohio State University, Pennsylvania StateUniversity, University of Portsmouth, Princeton University, theSpanish Participation Group, University of Tokyo, University ofUtah, Vanderbilt University, University of Virginia, University ofWashington, and Yale University.
Abstract
We report on an optical (SDSS) and X-ray (XMM-Newton) study of an optically selected sample of four dual AGN systems at projected separations of 30-60 kpc. All sources are detected in the X-ray band (0.3-10keV); seven objects are optically identified as Seyfert, while one source, optically classified as a low-ionization nuclear emission-line region (LINER), is likely powered by accretion in virtue of its relatively high X-ray luminosity (1.2 × 1041 erg s-1). Six of the eight objects are obscured in X-rays with NH ≥ 1023 cm-2; three of these, whose X-ray spectrum is dominated by a reflection component, are likely Compton-thick (NH ≥ 1024 cm-2). This finding is in agreement with the hypothesis that galaxy encounters are effective in driving gas inflow toward the nuclear region, thus increasing the obscuration. We compare the absorption properties in our dual AGN with those in larger samples observed in X-rays but selected in different ways (optical, IR, and hard X-rays). We find that the obscured (NH ≥ 1022 cm-2) AGN fraction within the larger sample is 84 ± 4 per cent (taking into account the 90 per cent error on the NH measure) up to large pair separations (∼100 kpc). This is statistically higher than the fraction of obscured AGN in isolated galaxies found in X-ray surveys.
Volume
480
Issue
2
Start page
1639
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.480.1639D
Rights
open.access
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