Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 480, Issue 2, Pages 1639-1655Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1867
Keywords
galaxies: active; galaxies: interactions; galaxies: nuclei; X-rays: general
Categories
Funding
- International Space Science Institute (ISSI), Bern, Switzerland
- ASI-INAF [2017-14-H.O.]
- Italian Space Agency [ASI-INAF I/037/12/0]
- ESA-ESTEC visitor program
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- Princeton University
- Yale University
- University of Florida
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
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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 x 10(41) erg s(-1)). Six of the eight objects are obscured in X-rays with N-H >= 10(23) cm(-2) ; three of these, whose X-ray spectrum is dominated by a reflection component, are likely Compton-thick (N-H >= 10(24) 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 (N-H >= 10(22) 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 (similar to 100 kpc). This is statistically higher than the fraction of obscured AGN in isolated galaxies found in X-ray surveys.
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