An [O iii ] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1
Abstract
ABSTRACT 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 ≈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° 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 104–105 yr.
- Authors:
-
[2];
[5];
- Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487, USA, Current address: Husch Blackwell, 190 Carondelet Plaza, Suite 600, St Louis, MO 63105, USA, SARA Observatory, Embry-Riddle Aeronautical University, Melbourne, FL 32114, USA
- Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487, USA, SARA Observatory, Embry-Riddle Aeronautical University, Melbourne, FL 32114, USA
- Department of Mathematics, Washington University in St Louis, One Brookings Drive, St Louis, MO 63130, USA
- Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93407, USA
- Special Astrophysical Observatory, Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1634251
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 496 Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Knese, Erin Darnell, Keel, William C., Knese, Greg, Bennert, Vardha N., Moiseev, Alexei, Grokhovskaya, Aleksandra, and Dodonov, Sergei N. An [O iii ] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa1510.
Knese, Erin Darnell, Keel, William C., Knese, Greg, Bennert, Vardha N., Moiseev, Alexei, Grokhovskaya, Aleksandra, & Dodonov, Sergei N. An [O iii ] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1. United Kingdom. https://doi.org/10.1093/mnras/staa1510
Knese, Erin Darnell, Keel, William C., Knese, Greg, Bennert, Vardha N., Moiseev, Alexei, Grokhovskaya, Aleksandra, and Dodonov, Sergei N. Tue .
"An [O iii ] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1". United Kingdom. https://doi.org/10.1093/mnras/staa1510.
@article{osti_1634251,
title = {An [O iii ] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1},
author = {Knese, Erin Darnell and Keel, William C. and Knese, Greg and Bennert, Vardha N. and Moiseev, Alexei and Grokhovskaya, Aleksandra and Dodonov, Sergei N.},
abstractNote = {ABSTRACT 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 ≈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° 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 104–105 yr.},
doi = {10.1093/mnras/staa1510},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 496,
place = {United Kingdom},
year = {Tue Jun 02 00:00:00 EDT 2020},
month = {Tue Jun 02 00:00:00 EDT 2020}
}
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