Flare and Warp of Galactic Disk with OB Stars from Gaia DR2

doi:10.3847/1538-4357/aafa17

CORC > 上海天文台 > 中国科学院上海天文台

	Flare and Warp of Galactic Disk with OB Stars from Gaia DR2
	Li,Chengdong 1,2; Zhao,Gang 1,2; Jia,Yunpeng 1,2; Liao,Shilong 3; Yang,Chengqun 1,2; Wang,Qixun 1,2
刊名	The Astrophysical Journal
	2019-02-01
卷号	871 期号:2
关键词	Galaxy: disk Galaxy: fundamental parameters Galaxy: kinematics and dynamics Galaxy: structure
ISSN号	0004-637X
DOI	10.3847/1538-4357/aafa17
英文摘要	Abstract The OB stars are selected from the Gaia DR2 catalog to explore the flare and warp of the Galactic disk in this work. The Gaia and 2MASS photometric information is adopted as the criteria to choose the sample stars. We model the Galactic disk stellar distribution in this work taking the flare and warp into consideration. The parameters in the flare and warp model are acquired directly by fitting the stars with the stellar distribution function of the disk. We obtain that the scale length of the Galactic disk in space density is 2.10?±?0.01 kpc. We find that the disk scale height increases with Galactic radius via fitting our sample stars perpendicular to the Galactic plane. The scale height of OB stars increases more moderately than old stellar populations in the disk. It is also concluded that the inner disk is flat and begins to warp at about 9 kpc away from Galactic center. The warp amplitude of OB stars is similar to pulsars and slowly increases along the Galactic radius.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-871-2-AAFA17
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31933]
专题	中国科学院上海天文台
作者单位	1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China; gzhao@nao.cas.cn 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences; 80 Nandan Road, 200030 Shanghai, People’s Republic of China
推荐引用方式 GB/T 7714	Li,Chengdong,Zhao,Gang,Jia,Yunpeng,et al. Flare and Warp of Galactic Disk with OB Stars from Gaia DR2[J]. The Astrophysical Journal,2019,871(2).
APA	Li,Chengdong,Zhao,Gang,Jia,Yunpeng,Liao,Shilong,Yang,Chengqun,&Wang,Qixun.(2019).Flare and Warp of Galactic Disk with OB Stars from Gaia DR2.The Astrophysical Journal,871(2).
MLA	Li,Chengdong,et al."Flare and Warp of Galactic Disk with OB Stars from Gaia DR2".The Astrophysical Journal 871.2(2019).