Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 496, Issue 2, Pages 1035-1050Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1510
Keywords
galaxies: active; galaxies: individual (Mkn 1); galaxies: ISM; galaxies: Seyfert
Categories
Funding
- Ministry of Science and Higher Education of the Russian Federation [05.619.21.0016, RFMEFI61919X0016]
- National Science Foundation (NSF) Research at Undergraduate Institutions (RUI) grant [AST-1909297]
- NSF [DMS-1363239, DMS-1900816]
- Russian Science Foundation [1712-01335]
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration
- National Science Foundation
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- University of Chicago
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Los Alamos National Laboratory
- Max-Planck-Institute forAstronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Princeton University
- United States Naval Observatory
- University of Washington
- Russian Science Foundation [20-12-18033] Funding Source: Russian Science Foundation
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Motivated by the discovery of large ionized clouds around AGN, and particularly the large fraction of those that are consistent with photoionized gaseous tidal debris, we searched for [O III] emission around Seyfert galaxies previously mapped in H I, many with extended gas features. Of 26 Seyfert galaxies, we find one spatially extended emission feature, a discrete cloud projected approximate to 12 kpc SW from the centre of Mkn 1 and spanning a transverse extent of 8 kpc. Optical spectroscopy (Kast/Lick and SCORPIO/BTA) of this cloud confirms its association with the Mkn 1-NGC 451 galaxy pair, closely matching the kinematics of nearby H I structures, and reveals emission-line ratios requiring photoionization by the AGN at roughly the direct observed luminosity of the nucleus. For the entire sample, the full opening angle of the ionization cones (bicones) must be <20 degrees if the AGNs are continuously bright for scales longer than the light-traveltimes to the H I structures. Since typical AGN ionization cones are observed to be much broader than this, our low detection fraction may add to evidence for the ubiquity of strong variations in AGN luminosity on scales 10(4)-10(5) yr.
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