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首页> 外文期刊>The Astrophysical journal >STRUCTURAL PARAMETERS OF FAINT GALAXIES FROM PREREFURBISHMENT HUBBLE SPACE TELESCOPE MEDIUM DEEP SURVEY OBSERVATIONS
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STRUCTURAL PARAMETERS OF FAINT GALAXIES FROM PREREFURBISHMENT HUBBLE SPACE TELESCOPE MEDIUM DEEP SURVEY OBSERVATIONS

机译：翻新前的望远镜空间望远镜中深层探测观测到的模糊星系的结构参数

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摘要

We present a statistical study of the properties of faint galaxies from a large catalog of about 13,500 objects found in 112 random fields observed with the Hubble Space Telescope Wide Field Camera before refurbishment. The majority of the objects are faint galaxies with 18 < I < 25 mag. For each object we determine half-light radius, magnitude, color, and a crude classification based on the object's luminosity profile, by fitting two-dimensional models to undeconvolved images. The catalog is better than 80% complete to a depth ranging between I ～ 21 mag for the shortest exposures (0.5 hr), up to 23.8 for the longest exposure (about 5 hr). Number counts in the range 18 < I < 22 mag exceed ground-based results by about 50%; many galaxies in this magnitude range are small enough that they could be misclassified as stars from the ground. A clear bifurcation is found in the observed colors of faint spirals and ellipticals, with the latter becoming significantly redder for I > 20 mag. Typical half-light radii of faint galaxies are somewhat smaller than spirals. Half-light radius is not correlated with (V — I) color for I approx< 21 mag; at fainter magnitudes, a weak correlation in the sense of larger galaxies being redder is marginally detected.
机译：我们对翻新前的哈勃太空望远镜广角相机在112个随机场中发现的约13,500个物体的大型目录中的微弱星系的属性进行了统计研究。大多数物体是18 ​​ 20 mag时，后者变得明显变红。微弱星系的典型半光半径略小于螺旋形。当I大约<21 mag时，半光半径与（V — I）颜色无关。在较弱的量级上，在较大的星系变红的意义上，微弱的相关性被检测到。

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