论文标题
距Arecibo调查的18个矮星系的距离
Distances to 18 Dwarf Galaxies from the Arecibo Survey
论文作者
论文摘要
基于档案中的哈勃太空望远镜图像，我们为18个矮星系进行了出色的光度法。在构建的赫兹普朗 - 鲁塞尔图中看到了年轻和老恒星的分支。使用红色巨人的光度法并应用TRGB方法，我们首次确定了所有18个星系的准确距离。 Galaxies AGC238890和AGC747826分别具有最低（$ d $ = 5.1 MPC）和最大（$ D $ = 12.0 MPC）距离。其余星系的距离在此范围内。通过测量红色巨型分支的颜色指数：AGC102728，AGC198691，AGC205590，AGC223231，AGC731921和AGC747826，已经确定了低金属性星系。我们以创纪录的低金属性确定了与AGC198691的距离。由于AGC223254，AGC229053，AGC229379，AGC238890，AGC731921和AGC742601都被投影到处女座星系群上，因此，由我们与以前在Arecibo相互作用的速度相同的距离估算的距离估计，可以对arecibo的速度进行改进，以改进arecibo的速度。
Based on the archival Hubble Space Telescope images, we have performed stellar photometry for 18 dwarf galaxies. Branches of young and old stars are seen on the constructed Hertzsprung-Russell diagrams. Using the photometry of red giants and applying the TRGB method, we have determined accurate distances for all 18 galaxies for the first time. The galaxies AGC238890 and AGC747826 have minimum ($D$ = 5.1 Mpc) and maximum ($D$ = 12.0 Mpc) distances, respectively. The distances to the remaining galaxies lie within this range. Low-metallicity galaxies have been identified by measuring the color indices of the red giant branch: AGC102728, AGC198691, AGC205590, AGC223231, AGC731921, and AGC747826. We have determined the distance to AGC198691 with a record low metallicity. Since AGC223254, AGC229053, AGC229379, AGC238890, AGC731921, and AGC742601 are projected onto the Virgo cluster of galaxies, the distances estimated by us together with the velocities of these galaxies measured previously at Arecibo can be used to refine the effect of galaxy infall to the Virgo cluster.
