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A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS
Liu, Chao1,2; Xue, Xiangxiang1,2; Fang, Min3,4; van de Ven, Glenn2; Wu, Yue1; Smith, Martin C.5; Carrell, Kenneth1
2012-07-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume753Issue:1Pages:L24(3pp)
AbstractWe investigate the extinction, together with the radial velocity (RV) dispersion and distribution of red clump stars in the anticenter direction using spectra obtained with Hectospec on the MMT. We find that extinction peaks at Galactocentric radii of about 9.5 and 12.5 kpc, right in front of the locations of the Perseus and Outer arms and in line with the relative position of dust and stars in external spiral galaxies. The RV dispersion peaks around 10 kpc, which coincides with the location of the Perseus arm, yields an estimated arm-interarm density contrast of 1.3-1.5, and is in agreement with previous studies. Finally, we discover that the RV distribution bifurcates around 10-11 kpc into two peaks at +27 km s(-1) and -4 km s(-1). This seems to be naturally explained by the presence of the outer Lindblad resonance of the Galactic bar, but further observations will be needed to understand if the corotation resonance of the spirals arms also plays a role.
KeywordGalaxies: Individual (Milky Way) Galaxy: Disk Galaxy: Kinematics And Dynamics Galaxy: Structure Stars: Kinematics And Dynamics
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/753/1/L24
WOS KeywordSTELLAR VELOCITY DISTRIBUTION ; SOLAR NEIGHBORHOOD ; SPIRAL STRUCTURE ; GALACTIC DISC ; BAR ; PARAMETERS ; PARALLAXES ; 2MASS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000305637900024
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8016
Collection分子云与恒星形成研究团组
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Max Planck Inst Astron, D-69117 Heidelberg, Germany
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Liu, Chao,Xue, Xiangxiang,Fang, Min,et al. A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,753(1):L24(3pp).
APA Liu, Chao.,Xue, Xiangxiang.,Fang, Min.,van de Ven, Glenn.,Wu, Yue.,...&Carrell, Kenneth.(2012).A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS.ASTROPHYSICAL JOURNAL LETTERS,753(1),L24(3pp).
MLA Liu, Chao,et al."A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS".ASTROPHYSICAL JOURNAL LETTERS 753.1(2012):L24(3pp).
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