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

Flare and Warp of Galactic Disk with OB Stars from Gaia DR2
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带有来自盖亚 DR2 的 OB 星的银盘耀斑和扭曲

DOI:
10.3847/1538-4357/aafa17
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发表时间:
2019-02
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Wang Qixun
Wang Qixun
中科院分区:
其他
文献类型:
--
作者:
Li Chengdong;Zhao Gang;Jia Yunpeng;Liao Shilong;Yang Chengqun;Wang Qixun

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OB星是从盖亚DR2星表中选择的,以探索银河系盘的耀斑和翘曲。以Gaia和2MASS的光度信息作为选取样本星的标准。在这项工作中,我们考虑到耀斑和翘曲的银河系盘恒星分布模型。耀斑和翘曲模型中的参数直接由星盘的恒星分布函数拟合得到。我们得到银盘的空间密度标度长度为2.10 ± 0.01kpc。通过对样本恒星垂直于银道面的拟合,我们发现盘尺度高度随银道半径的增加而增加。OB星的尺度高度比盘中的老恒星群体增加得更温和。我们还得出结论,内盘是平坦的,并开始翘曲约9 kpc从银河系中心。OB星的翘曲幅度类似于银星,并沿银河半径沿着缓慢增加。
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.
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