论文标题
使用紫外线/Astrosat恒星计数研究银河系结构
Study of Galactic Structure Using UVIT/AstroSat Star Counts
论文作者
论文摘要
我们的银河系结构已从紫外成像望远镜（UVIT）获得的紫外线（UV）恒星计数进行了研究。 F154W（BAF2）和N263M（NUVB4）过滤器分别用于FUV和NUV频段中。使用红外（IR）颜色切割方法将点源与紫外线观测的半乳酸外源分开。观察到的紫色恒星计数与从恒星种群合成的Besançon模型朝着多个银河方向获得的模拟良好匹配。我们还使用空间密度函数以及中间银河纬度的恒星的指数密度定律估计了厚盘的尺度长度和尺度高度以及薄盘的比例高度。厚光盘的比例长度从3.11到5.40 kpc不等，而尺度的高度范围从530 $ \ pm $ 32 PC到630 $ \ pm $ 29 PC。薄碟的比例高度在230美元$ \ pm $ 20 pc至330 $ \ pm $ 11 pc的范围内。
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the {\em AstroSat} satellite, in Far-UV (FUV) and Near-UV (NUV) bands. The F154W (BaF2) and N263M (NUVB4) filters were used in the FUV and NUV bands, respectively. The point sources are separated from the extra-galactic sources of UVIT observations using infrared (IR) color cut method. The observed UVIT star counts match well with the simulations obtained from the Besançon model of stellar population synthesis towards several Galactic directions. We also estimated the scale length and scale height of the thick disc and the scale height of the thin disc using the space density function and the exponential density law for the stars of intermediate Galactic latitudes. The scale length of the thick disc ranges from 3.11 to 5.40 kpc whereas the scale height ranges from 530$\pm$32 pc to 630$\pm$29 pc. The scale height of the thin disc comes out to be in the range of 230$\pm$20 pc to 330$\pm$11 pc.
