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Stellar disks and halos of edge-on spiral galaxies: NGC 891, NGC 4144, and NGC 4244

机译:边缘螺旋星系的恒星盘和光晕:NGC 891,NGC 4144和NGC 4244

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摘要

Stellar photometry of images from the ACS and WFPC2 cameras on the Hubble Space Telescope (HST) is used to study the star composition and spatial distribution of stars in three edge-on visible spiral galaxies: NGC 891, NGC 4144, and NGC 4244. Measurements of the surface number density of old stars revealed two stellar subsystems in these galaxies: a thick disk and a halo. The boundaries of these subsystems, which consist mainly of red giants, are determined from the change in the gradient of the number density of the stars. The halos are flattened at the poles of the galaxies and extend to distances of 8-25 kpc from the planes of the galaxies. The present results on the number density distribution of stars with different ages perpendicular to the planes of these galaxies make it possible to improve our model for the stellar structure of spiral galaxies. The distances to these galaxies are calculated using a determination of the tip of the red giant branches (the TRGB method): D = 9.82 Mpc (NGC 891), D = 7.24 Mpc (NGC 4144), and D = 4.29 Mpc (NGC 4244).
机译:哈勃太空望远镜(HST)上的ACS和WFPC2相机的图像的恒星光度法用于研究三个边缘可见螺旋星系(NGC 891,NGC 4144和NGC 4244)中的恒星组成和空间分布。老恒星表面数密度的变化揭示了这些星系中的两个恒星子系统:厚的圆盘和光晕。这些子系统主要由红色巨星组成,其边界是根据恒星数密度梯度的变化确定的。光晕在星系的两极变平,并延伸到距星系平面8-25 kpc的距离。目前关于垂直于这些星系平面的不同年龄恒星数密度分布的结果,有可能改进我们关于旋涡星系恒星结构的模型。到这些星系的距离是通过确定红色巨型分支的尖端(TRGB方法)来计算的:D = 9.82 Mpc(NGC 891),D = 7.24 Mpc(NGC 4144)和D = 4.29 Mpc(NGC 4244) )。

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