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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Physical properties of distant red galaxies in the COSMOS/UltraVISTA field
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Physical properties of distant red galaxies in the COSMOS/UltraVISTA field

机译：COSMOS / UltraVISTA场中遥远的红色星系的物理特性

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摘要

We present a study on physical properties for a large distant red galaxy (DRG) sample, using the K-selected multi-band photometry catalog of the COSMOS/UltraVISTA field and the CANDELS near-infrared data. Our sample includes 4485 DRGs with (J - K)(AB) > 1.16 and K-AB < 23.4 mag, and 132 DRGs have HST/WFC3 morphological measurements. The results of nonparametric measurements of DRG morphology are consistent with our rest-frame UVJ color classification; quiescent DRGs are generally compact while star-forming DRGs tend to have extended structures. We find the star formation rate (SFR) and the stellar mass of star-forming DRGs present tight "main sequence" relations in all redshift bins. Moreover, the specific SFR (sSFR) of DRGs increases with redshift in all stellar mass bins and DRGs with higher stellar masses generally have lower sSFRs, which indicates that galaxies were much more active on average in the past, and star formation contributes more to the mass growth of low-mass galaxies than to high-mass galaxies. The infrared-derived SFR dominates the total SFR of DRGs which occupy the high-mass range, implying that the J - K color criterion effectively selects massive and dusty galaxies. DRGs with higher M-* generally have redder (U - V)(rest) colors, and the (U - V)(rest) colors of DRGs become bluer at higher redshifts, suggesting high-mass galaxies have higher internal dust extinctions or older stellar ages and they evolve with time. Finally, we find that DRGs have different overlap among extremely red objects, BzK galaxies, IRAC-selected extremely red objects, and high-z ultraluminous infrared galaxies, indicating that DRGs are not a special population and they can also be selected by other color criteria.
机译：我们使用COSMOS / UltraVISTA场的K-selected多波段测光目录和CANDELS近红外数据，对大距离红色星系（DRG）样品的物理性质进行了研究。我们的样本包括（J-K）（AB）> 1.16和K-AB <23.4 mag的4485个DRG，以及132个具有HST / WFC3形态学测量值的DRG。 DRG形态的非参数测量结果与我们的其余帧UVJ颜色分类一致;静态DRG通常很紧凑，而星形的DRG往往具有扩展的结构。我们发现，恒星形成速率（SFR）和恒星形成DRG的恒星质量在所有红移区中都呈现出紧密的“主序列”关系。此外，在所有恒星质量块中，DRG的特定SFR（sSFR）随红移而增加，而具有较高恒星质量的DRG通常具有较低的sSFR，这表明过去平均而言，星系活跃得多，而恒星形成对星系的贡献更大。低质量星系的质量增长要大于高质量星系。红外衍生的SFR在占据高质量范围的DRG的总SFR中占主导地位，这意味着J-K颜色标准有效地选择了大型且尘土飞扬的星系。 M- *较高的DRG通常具有（U-V）（其余）较红的颜色，DRG的（U-V）（其余）颜色在较高的红移时会变蓝，这表明高质量星系的内部消光度更高或更旧。恒星时代，它们随着时间而发展。最后，我们发现DRG在极红色物体，BzK星系，IRAC选择的极红色物体和高z超发光红外星系之间具有不同的重叠，这表明DRG不是特殊的种群，也可以通过其他颜色标准进行选择。

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