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Article: SiO maser survey of the large-amplitude variables in the galactic center

TitleSiO maser survey of the large-amplitude variables in the galactic center
Authors
KeywordsGalaxy: Center, Kinematics, And Dynamics
Masers
Stars: Agb And Post-Agb
Issue Date2004
PublisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/
Citation
Publications Of The Astronomical Society Of Japan, 2004, v. 56 n. 2, p. 261-294 How to Cite?
AbstractWe have surveyed ∼ 400 known large-amplitude variables within 15′ of the galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 180 detections. SiO lines were detected from 16 other sources located within 20″ of the program objects. The detection rate of 48% is comparable to that in bulge IRAS surveys. Among the detections, five stars have radial velocities greater than 200kms -1. The detection rate increases steeply with the period of light variation, particularly for stars with P > 500 d, where it exceeds 80%. At a given period, the SiO detection rate is approximately three-times that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources. From the set of radial velocity data, the mass distribution within 30 pc of the galactic center was derived based on the collisionless Boltzmann equation integrated along the line of sight. The mass is about 6.5 (±0.7) × 10 7M ⊙ and the mass of the central black hole is 2.7 (±1.3) × 10 6M ⊙. From the line-of-sight velocity of each star and its potential energy we conclude that the five high-velocity stars come from galactocentric distances as far as 300 pc. A high-velocity subsample of stars with negative radial velocities exhibits a tendency to have brighter K magnitudes than a subsample with positive velocities. The origin of these stars is discussed.
Persistent Identifierhttp://hdl.handle.net/10722/174957
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorDeguchi, Sen_US
dc.contributor.authorImai, Hen_US
dc.contributor.authorFujii, Ten_US
dc.contributor.authorGlass, ISen_US
dc.contributor.authorIta, Yen_US
dc.contributor.authorIzumiura, Hen_US
dc.contributor.authorKameya, Oen_US
dc.contributor.authorMiyazaki, Aen_US
dc.contributor.authorNakada, Yen_US
dc.contributor.authorNakashima, JIen_US
dc.date.accessioned2012-11-26T08:48:21Z-
dc.date.available2012-11-26T08:48:21Z-
dc.date.issued2004en_US
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2004, v. 56 n. 2, p. 261-294en_US
dc.identifier.issn0004-6264en_US
dc.identifier.urihttp://hdl.handle.net/10722/174957-
dc.description.abstractWe have surveyed ∼ 400 known large-amplitude variables within 15′ of the galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 180 detections. SiO lines were detected from 16 other sources located within 20″ of the program objects. The detection rate of 48% is comparable to that in bulge IRAS surveys. Among the detections, five stars have radial velocities greater than 200kms -1. The detection rate increases steeply with the period of light variation, particularly for stars with P > 500 d, where it exceeds 80%. At a given period, the SiO detection rate is approximately three-times that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources. From the set of radial velocity data, the mass distribution within 30 pc of the galactic center was derived based on the collisionless Boltzmann equation integrated along the line of sight. The mass is about 6.5 (±0.7) × 10 7M ⊙ and the mass of the central black hole is 2.7 (±1.3) × 10 6M ⊙. From the line-of-sight velocity of each star and its potential energy we conclude that the five high-velocity stars come from galactocentric distances as far as 300 pc. A high-velocity subsample of stars with negative radial velocities exhibits a tendency to have brighter K magnitudes than a subsample with positive velocities. The origin of these stars is discussed.en_US
dc.languageengen_US
dc.publisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/en_US
dc.relation.ispartofPublications of the Astronomical Society of Japanen_US
dc.subjectGalaxy: Center, Kinematics, And Dynamicsen_US
dc.subjectMasersen_US
dc.subjectStars: Agb And Post-Agben_US
dc.titleSiO maser survey of the large-amplitude variables in the galactic centeren_US
dc.typeArticleen_US
dc.identifier.emailNakashima, JI: junichi@hku.hken_US
dc.identifier.authorityNakashima, JI=rp00764en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-2442672939en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2442672939&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume56en_US
dc.identifier.issue2en_US
dc.identifier.spage261en_US
dc.identifier.epage294en_US
dc.publisher.placeJapanen_US
dc.identifier.scopusauthoridDeguchi, S=7006314159en_US
dc.identifier.scopusauthoridImai, H=35484255500en_US
dc.identifier.scopusauthoridFujii, T=35407098300en_US
dc.identifier.scopusauthoridGlass, IS=7005360979en_US
dc.identifier.scopusauthoridIta, Y=6603114538en_US
dc.identifier.scopusauthoridIzumiura, H=7003867533en_US
dc.identifier.scopusauthoridKameya, O=7003729470en_US
dc.identifier.scopusauthoridMiyazaki, A=7201588306en_US
dc.identifier.scopusauthoridNakada, Y=7102781029en_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US

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