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Article: Jet-disturbed molecular gas near the Seyfert 2 nucleus in M 51

TitleJet-disturbed molecular gas near the Seyfert 2 nucleus in M 51
Authors
KeywordsGalaxies: Individual: M 51
Galaxies: Individual: Ngc 5194
Galaxies: Ism
Galaxies: Seyfert
Issue Date2007
PublisherE D P Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2007, v. 468 n. 3, p. L49-L52 How to Cite?
AbstractContext. Previous molecular gas observations at arcsecond-scale resolution of the Seyfert 2 galaxy M 51 suggest the presence of a dense circumnuclear rotating disk, which may be the reservoir for fueling the active nucleus and obscures it from direct view in the optical. However, our recent interferometric CO(3-2) observations show a hint of a velocity gradient perpendicular to the rotating disk, which suggests a more complex structure than previously thought. Aims. To image the putative circumnuclear molecular gas disk at sub-arcsecond resolution to better understand both the spatial distribution and kinematics of the molecular gas. Methods. We carried out CO(2-1) and CO(1-0) line observations of the nuclear region of M 51 with the new A configuration of the IRAM Plateau de Bure Interferometer, yielding a spatial resolution lower than 15 pc. Results. The high resolution images show no clear evidence of a disk, aligned nearly east-west and perpendicular to the radio jet axis, as suggested by previous observations, but show two separate features located on the eastern and western sides of the nucleus. The western feature shows an elongated structure along the jet and a good velocity correspondence with optical emission lines associated with the jet, suggesting that this feature is a jet-entrained gas. The eastern feature is elongated nearly east-west ending around the nucleus. A velocity gradient appears in the same direction with increasingly blueshifted velocities near the nucleus. This velocity gradient is in the opposite sense of that previously inferred for the putative circumnuclear disk. Possible explanations for the observed molecular gas distribution and kinematics are that a rotating gas disk disturbed by the jet, gas streaming toward the nucleus, or a ring with another smaller counter- or Keplarian-rotating gas disk inside. © ESO 2007.
Persistent Identifierhttp://hdl.handle.net/10722/175072
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMatsushita, Sen_US
dc.contributor.authorMuller, Sen_US
dc.contributor.authorLim, Jen_US
dc.date.accessioned2012-11-26T08:49:06Z-
dc.date.available2012-11-26T08:49:06Z-
dc.date.issued2007en_US
dc.identifier.citationAstronomy And Astrophysics, 2007, v. 468 n. 3, p. L49-L52en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/10722/175072-
dc.description.abstractContext. Previous molecular gas observations at arcsecond-scale resolution of the Seyfert 2 galaxy M 51 suggest the presence of a dense circumnuclear rotating disk, which may be the reservoir for fueling the active nucleus and obscures it from direct view in the optical. However, our recent interferometric CO(3-2) observations show a hint of a velocity gradient perpendicular to the rotating disk, which suggests a more complex structure than previously thought. Aims. To image the putative circumnuclear molecular gas disk at sub-arcsecond resolution to better understand both the spatial distribution and kinematics of the molecular gas. Methods. We carried out CO(2-1) and CO(1-0) line observations of the nuclear region of M 51 with the new A configuration of the IRAM Plateau de Bure Interferometer, yielding a spatial resolution lower than 15 pc. Results. The high resolution images show no clear evidence of a disk, aligned nearly east-west and perpendicular to the radio jet axis, as suggested by previous observations, but show two separate features located on the eastern and western sides of the nucleus. The western feature shows an elongated structure along the jet and a good velocity correspondence with optical emission lines associated with the jet, suggesting that this feature is a jet-entrained gas. The eastern feature is elongated nearly east-west ending around the nucleus. A velocity gradient appears in the same direction with increasingly blueshifted velocities near the nucleus. This velocity gradient is in the opposite sense of that previously inferred for the putative circumnuclear disk. Possible explanations for the observed molecular gas distribution and kinematics are that a rotating gas disk disturbed by the jet, gas streaming toward the nucleus, or a ring with another smaller counter- or Keplarian-rotating gas disk inside. © ESO 2007.en_US
dc.languageengen_US
dc.publisherE D P Sciences. The Journal's web site is located at http://www.aanda.orgen_US
dc.relation.ispartofAstronomy and Astrophysicsen_US
dc.subjectGalaxies: Individual: M 51en_US
dc.subjectGalaxies: Individual: Ngc 5194en_US
dc.subjectGalaxies: Ismen_US
dc.subjectGalaxies: Seyferten_US
dc.titleJet-disturbed molecular gas near the Seyfert 2 nucleus in M 51en_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.doi10.1051/0004-6361:20067039en_US
dc.identifier.scopuseid_2-s2.0-34250785766en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34250785766&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume468en_US
dc.identifier.issue3en_US
dc.identifier.spageL49en_US
dc.identifier.epageL52en_US
dc.identifier.isiWOS:000247084400007-
dc.publisher.placeFranceen_US
dc.identifier.scopusauthoridMatsushita, S=7201408992en_US
dc.identifier.scopusauthoridMuller, S=15071043100en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US

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