死亡序列：星系颜色从z=0到z=2.5的明显双峰性
The Dead Sequence: A Clear Bimodality in Galaxy Colors from z=0 to z=2.5
摘要：
我们从NEWFIRM中带巡天（NMBS）中选取了25，000个星系，研究了0 < z < 2.5星系的静止坐标系U-V色分布。NMBS的五个独特的近红外滤光片可以精确测量9，900个星系在1 < z < 2.5时的光度红移和静止坐标系颜色。在z<~2.5时，静止坐标系的U-V颜色分布是双峰的，有一个红色的峰值，一个蓝色的峰值，以及介于两者之间的星系群（绿色的谷）。模型拟合的光学近红外SEDs和MIPS探测到的星系的分布表明，在绿谷星系的颜色主要是由尘埃的红化量。这一结果并不支持最简单的解释，即绿谷天体是从蓝色恒星形成星系过渡到红色静止星系。我们表明，纠正尘埃红化的静止帧的颜色允许一个非常干净的红色和蓝色序列之间的分离z~2.5。我们的研究证实，尘埃星暴星系可以贡献一个显着的分数红色序列样本的基础上选择一个单一的休息帧颜色（即U-V），所以必须采取额外的照顾，如果真正的“红色和死亡”的星系的样本是理想的。有趣的是，在24微米处检测到的星系中，有14%在应用红化校正后仍保留在红色序列上。
英文摘要：
We select 25,000 galaxies from the NEWFIRM Medium Band Survey (NMBS) to study the rest-frame U-V color distribution of galaxies at 0 < z < 2.5. The five unique NIR filters of the NMBS enable the precise measurement of photometric redshifts and rest-frame colors for 9,900 galaxies at 1 < z < 2.5. The rest-frame U-V color distribution at all z<~2.5 is bimodal, with a red peak, a blue peak, and a population of galaxies in between (the green valley). Model fits to the optical-NIR SEDs and the distribution of MIPS-detected galaxies indicate that the colors of galaxies in the green valley are determined largely by the amount of reddening by dust. This result does not support the simplest interpretation of green valley objects as a transition from blue star-forming to red quiescent galaxies. We show that correcting the rest-frame colors for dust reddening allows a remarkably clean separation between the red and blue sequences up to z~2.5. Our study confirms that dusty starburst galaxies can contribute a significant fraction to red sequence samples selected on the basis of a single rest-frame color (i.e. U-V), so extra care must be taken if samples of truly "red and dead" galaxies are desired. Interestingly, of galaxies detected at 24 microns, 14% remain on the red sequence after applying the reddening correction.
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