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Kinematics and stellar population properties of the Andromeda galaxy by using the spectroscopic observations of the Guoshoujing Telescope
Zou, Hu1,2; Yang, Yan-Bin1; Zhang, Tian-Meng1; Ma, Jun1; Zhou, Xu1; Luo, Ali1; Zhang, Hao-Tong1; Bai, Zhong-Rui1; Zhao, Yong-Heng1
2011-09-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume11Issue:9Pages:1093-1110
AbstractThe Andromeda galaxy was observed by the Guoshoujing Telescope (formerly named the Large Sky Area Multi-Object Fiber Spectroscopic Telescope - LAMOST), during the 2009 commissioning phase. Due to the absence of standard stars for flux calibration, we use the photometric data of 15 intermediate bands in the Beijing-Arizona-Taipei-Connecticut (BATC) survey to calibrate the spectra. in total, 59 spectra located in the bulge and disk of the galaxy are obtained. Kinematic and stellar population properties of the stellar content are derived with these spectra. We obtain the global velocity field and calculate corresponding rotation velocities out to about 7 kpc along the major axis. These rotation velocity measurements complement those of the gas content, such as the H I and CO. The radial velocity dispersion shows that the stars in the bulge are more dynamically thermal and the disk is more rotationally-supported. The age distribution shows that the bulge was formed about 12 Gyr ago, the disk is relatively younger and the ages of some regions along the spiral arms can reach as young as about 1 Gyr. These young stellar populations have a relatively richer abundance and larger reddening. The overall average metallicity of the galaxy approximates the solar metallicity and a very weak abundance gradient is gained. The reddening map gives a picture of a dust-free bulge and a distinct dusty ring in the disk.
KeywordMethods: Data Analysis Techniques: Spectroscopic Galaxies: Individual (M31) Galaxies: Stellar Content
Indexed BySCI
Language英语
WOS IDWOS:000295116100008
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8091
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zou, Hu,Yang, Yan-Bin,Zhang, Tian-Meng,et al. Kinematics and stellar population properties of the Andromeda galaxy by using the spectroscopic observations of the Guoshoujing Telescope[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(9):1093-1110.
APA Zou, Hu.,Yang, Yan-Bin.,Zhang, Tian-Meng.,Ma, Jun.,Zhou, Xu.,...&Zhao, Yong-Heng.(2011).Kinematics and stellar population properties of the Andromeda galaxy by using the spectroscopic observations of the Guoshoujing Telescope.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(9),1093-1110.
MLA Zou, Hu,et al."Kinematics and stellar population properties of the Andromeda galaxy by using the spectroscopic observations of the Guoshoujing Telescope".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.9(2011):1093-1110.
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