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arXiv 1206.3579astro-ph.CO
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关于高红移紧致半导体的结构和性质

On the Shapes and Structures of High-Redshift Compact Galaxies

M. Chevance, A. Weijmans, I. Damjanov, R. G. Abraham, L. Simard, S. van den Bergh, E. Caris, K. Glazebrook

摘要:

最近哈勃空间望远镜WFC 3的深空成像表明,大多数z~2的致密静止大质量星系可能包含盘。为了研究这一说法,我们比较了31个精心挑选的高红移大质量静止致密星系的椭圆率分布,一组质量选择的椭圆率和Sersic指数分布从2D结构拟合到~ 40,000 $附近的星系从斯隆数字巡天。柯尔莫哥洛夫-斯米尔诺夫检验表明,高红移星系的椭圆率分布与同样选择的大质量早型星系样本的椭圆率分布一致。然而,高红移样本的Sersic指数的分布与当地早型星系的分布不一致,而是类似于当地盘主导的人口。高红移致密星系的性质与本地早型和盘主导系统的性质之间的不匹配使我们得出结论,高红移致密星系的基本结构可能不太类似于任何单一的本地星系种群。任何类似于当前存在的高红移致密星系的星系群要么是不同类型星系的混合,要么可能是一个独特的天体类别。

英文摘要:

Recent deep Hubble Space Telescope WFC3 imaging suggests that a majority of compact quiescent massive galaxies at z~2 may contain disks. To investigate this claim, we have compared the ellipticity distribution of 31 carefully selected high-redshift massive quiescent compact galaxies to a set of mass-selected ellipticity and Sersic index distributions obtained from 2D structural fits to ~40,000$ nearby galaxies from the Sloan Digital Sky Survey. A Kolmogorov-Smirnov test shows that the distribution of ellipticities for the high-redshift galaxies is consistent with the ellipticity distribution of a similarly chosen sample of massive early-type galaxies. However the distribution of Sersic indices for the high-redshift sample is inconsistent with that of local early-type galaxies, and instead resembles that of local disk-dominated populations. The mismatch between the properties of high-redshift compact galaxies and those of both local early-type and disk-dominated systems leads us to conclude that the basic structures of high-redshift compact galaxies probably do not closely resemble those of any single local galaxy population. Any galaxy population analog to the high-redshift compact galaxies that exists at the current epoch is either a mix of different types of galaxies, or possibly a unique class of objects on their own.

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