z~1以来盘状星系的色廓线：探索外盘形成的可能性
Color Profiles of Disk Galaxies since z~1: Probing Outer Disk Formation Scenarios
摘要：
我们提供了415个盘星系的样本的深颜色轮廓，其红移范围为0.1<z<=1.1，并且包含在GOODS-South场的HST-ACS成像中（Giavalisco et al. 2004）。对于每个星系，选择通带组合，以获得在每个红移，最好的可能的近似休息帧u-g颜色。我们发现，在星盘中表现出截断的天体（II型天体）通常在其色廓线中的最小值出现在截断处或非常接近截断处，其最大到最小的色振幅小于~ 0. 2 mag/arcsec ^[2]，这一特征在所探索的红移范围内（即在最后~8 Gyr）一直存在。这种颜色结构与最近的模型预期（Roskar等人，2008）在质量上一致，其中表面亮度分布的中断是径向恒星形成截止和长期过程中恒星质量重新分布之间相互作用的结果。
英文摘要：
We present deep color profiles for a sample of 415 disk galaxies within the redshift range 0.1<z<=1.1, and contained in HST-ACS imaging of the GOODS-South field (Giavalisco et al. 2004). For each galaxy, passband combinations are chosen to obtain, at each redshift, the best possible aproximation to the rest-frame u-g color. We find that objects which show a truncation in their stellar disk (Type II objects) usually show a minimum in their color profile at the break, or very near to it, with a maximum to minimum amplitude in color of <~0.2 mag/arcsec^2, a feature which is persistent through the explored range of redshifts (i.e. in the last ~8 Gyr). This color structure is in qualitative agreement with recent model expectations (Roskar et al. 2008) where the break of the surface brightness profiles is the result of the interplay between a radial star formation cut-off and a redistribution of stellar mass by secular processes.
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