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Secrest_2017_ApJ_836_183.pdf
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FInal Published Version
Affiliation
Univ Arizona, LBT ObservIssue Date
2017-02-17Keywords
galaxies: activegalaxies: bulges
galaxies: dwarf
galaxies: interactions
galaxies: nuclei
galaxies: Seyfert
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IOP PUBLISHING LTDCitation
Was 49b: An Overmassive AGN in a Merging Dwarf Galaxy? 2017, 836 (2):183 The Astrophysical JournalJournal
The Astrophysical JournalRights
© 2017. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present a combined morphological and X-ray analysis of Was. 49, an isolated, dual-AGN system notable for the presence of a dominant AGN, Was 49b, in the disk of the primary galaxy, Was 49a, at a projected radial distance of 8. kpc from the nucleus. Using X-ray data from Chandra, the Nuclear Spectroscopic Telescope Array, and Swift, we find that this AGN has a bolometric luminosity of L-bol similar to 10(45) erg s(-1), with a black hole mass of M-BH = 1.3(-0.9)(+10)M(circle dot) . Despite the large mass, our analysis of optical data from the Discovery Channel Telescope shows that the supermassive black hole (SMBH) is hosted by a stellar counterpart with a mass of only 5.6(-2.6)(+4.9)M(circle dot), which makes the SMBH potentially larger than expected from SMBH-galaxy scaling relations, and the stellar counterpart exhibits a morphology that is consistent with dwarf elliptical galaxies. Our analysis of the system in the r and K bands indicates that Was. 49 is a minor merger, with the mass ratio of Was 49b to Was 49a between similar to 1:7 and similar to 1:15. This is in contrast with findings that the most luminous merger-triggered AGNs are found in major mergers and that minor mergers predominantly enhance AGN activity in the primary galaxy.ISSN
1538-4357Version
Final published versionSponsors
Alfred P. Sloan Foundation; National Science Foundation; U.S. Department of Energy Office of Science; National Aeronautics and Space Administration; Office of Naval ResearchAdditional Links
http://stacks.iop.org/0004-637X/836/i=2/a=183?key=crossref.8fe65eb971179ec7cc9f149fbea7f8c0ae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/836/2/183