A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 分子云与恒星形成研究团组

	A RESONANT FEATURE NEAR THE PERSEUS ARM REVEALED BY RED CLUMP STARS
	Liu, Chao 1,2; Xue, Xiangxiang 1,2; Fang, Min3,4 ; van de Ven, Glenn 2; Wu, Yue 1; Smith, Martin C.5; Carrell, Kenneth 1
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2012-07-01
卷号	753 期号:1 页码:L24(3pp)
关键词	galaxies: individual (Milky Way) Galaxy: disk Galaxy: kinematics and dynamics Galaxy: structure stars: kinematics and dynamics
ISSN号	2041-8205
英文摘要	We 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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STELLAR VELOCITY DISTRIBUTION ; SOLAR NEIGHBORHOOD ; SPIRAL STRUCTURE ; GALACTIC DISC ; BAR ; PARAMETERS ; PARALLAXES ; 2MASS
收录类别	SCI
语种	英语
WOS记录号	WOS:000305637900024
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8016]
专题	紫金山天文台_分子云与恒星形成研究团组
作者单位	1.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
推荐引用方式 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).