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Article: Prevalence of tidal interactions among local Seyfert galaxies

TitlePrevalence of tidal interactions among local Seyfert galaxies
Authors
KeywordsGalaxies: Active
Galaxies: Interactions
Galaxies: Ism
Galaxies: Seyfert
Galaxies: Structure
Issue Date2008
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2008, v. 679 n. 2, p. 1047-1093 How to Cite?
AbstractNo mechanisms have hitherto been conclusively demonstrated to be responsible for initiating optically luminous nuclear (Seyfert) activity in local disk galaxies. Only a small minority of such galaxies are visibly disturbed in optical starlight, with the observed disturbances being at best marginally stronger than those found in matched samples of inactive galaxies. Here we report the first systematic study of an optically selected sample of 23 active galaxies in atomic hydrogen (H I) gas, which is the most sensitive and enduring tracer known of tidal interactions. Eighteen of these galaxies are (generally) classified as Seyferts, with over half (and perhaps all) having [O III luminosities within 2 orders of magnitude of QSOs. Only ∼28% of these Seyfert galaxies are visibly disturbed in optical DSS2 images. By contrast, ∼94% of the same galaxies are disturbed in H I, in nearly all cases not just spatially but also kinematically on galactic (≳20 kpc) scales. In at least ∼67% and perhaps up to ∼94% of cases, the observed H I disturbances can be traced to tidal interactions with neighboring galaxies detected also in H i. The majority of these neighboring galaxies have projected separations of ≲100 kpc and differ in radial velocities by ≲100 km -1 from their respective Seyfert galaxies, and many have optical luminosities ranging from the Small to Large Magellanic Clouds. In a companion paper we show that only ∼ 15% of a matched control sample of inactive galaxies display comparable H i disturbances. Our results suggest that (1) most Seyfert galaxies (with high nuclear luminosities) have experienced tidal interactions in the recent past and (2) in most cases these tidal interactions are responsible for initiating events that lead to their nuclear activity. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175145
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorKuo, CYen_US
dc.contributor.authorLim, Jen_US
dc.contributor.authorTang, YWen_US
dc.contributor.authorHo, PTPen_US
dc.date.accessioned2012-11-26T08:49:24Z-
dc.date.available2012-11-26T08:49:24Z-
dc.date.issued2008en_US
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 679 n. 2, p. 1047-1093en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175145-
dc.description.abstractNo mechanisms have hitherto been conclusively demonstrated to be responsible for initiating optically luminous nuclear (Seyfert) activity in local disk galaxies. Only a small minority of such galaxies are visibly disturbed in optical starlight, with the observed disturbances being at best marginally stronger than those found in matched samples of inactive galaxies. Here we report the first systematic study of an optically selected sample of 23 active galaxies in atomic hydrogen (H I) gas, which is the most sensitive and enduring tracer known of tidal interactions. Eighteen of these galaxies are (generally) classified as Seyferts, with over half (and perhaps all) having [O III luminosities within 2 orders of magnitude of QSOs. Only ∼28% of these Seyfert galaxies are visibly disturbed in optical DSS2 images. By contrast, ∼94% of the same galaxies are disturbed in H I, in nearly all cases not just spatially but also kinematically on galactic (≳20 kpc) scales. In at least ∼67% and perhaps up to ∼94% of cases, the observed H I disturbances can be traced to tidal interactions with neighboring galaxies detected also in H i. The majority of these neighboring galaxies have projected separations of ≲100 kpc and differ in radial velocities by ≲100 km -1 from their respective Seyfert galaxies, and many have optical luminosities ranging from the Small to Large Magellanic Clouds. In a companion paper we show that only ∼ 15% of a matched control sample of inactive galaxies display comparable H i disturbances. Our results suggest that (1) most Seyfert galaxies (with high nuclear luminosities) have experienced tidal interactions in the recent past and (2) in most cases these tidal interactions are responsible for initiating events that lead to their nuclear activity. © 2008. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectGalaxies: Activeen_US
dc.subjectGalaxies: Interactionsen_US
dc.subjectGalaxies: Ismen_US
dc.subjectGalaxies: Seyferten_US
dc.subjectGalaxies: Structureen_US
dc.titlePrevalence of tidal interactions among local Seyfert galaxiesen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/587044en_US
dc.identifier.scopuseid_2-s2.0-46349090446en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-46349090446&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume679en_US
dc.identifier.issue2en_US
dc.identifier.spage1047en_US
dc.identifier.epage1093en_US
dc.identifier.eissn1538-4357-
dc.identifier.isiWOS:000256315500011-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridKuo, CY=24449062500en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridTang, YW=24449822900en_US
dc.identifier.scopusauthoridHo, PTP=7402211489en_US

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