从GOODS NICMOS巡天（GNS）中选择的z=3的半导体星系样本中恒星的形成
Star Formation in a Stellar Mass Selected Sample of Galaxies to z=3 from the GOODS NICMOS Survey (GNS)
摘要：
我们提出了一个恒星质量选择样本的星系在GOODS NICMOS调查（GNS），基于深哈勃太空望远镜成像的GOODS北场和南场的恒星形成特性的研究。使用恒星质量选择的样品，结合HST/ACS和斯皮策数据来测量紫外和红外衍生的恒星形成率（SFR），我们研究了一个完整的样品~1300星系的恒星形成的性质，在红移1.5<z<3。8%的样本由M*>10^11 Msun的大质量星系组成。我们推导出光学颜色、尘埃消光以及紫外和红外SFR，以确定恒星形成率如何随着恒星质量和时间的变化而变化。我们的研究结果表明，SFR增加在更高的恒星质量，使大规模的星系几乎增加了一倍，从恒星形成的恒星质量单独在红移范围内的研究，但SFR的平均值为一个给定的恒星质量保持不变，在这2 Gyr期间。此外，在我们感兴趣的红移范围内，我们没有发现我们样本的SFR作为质量的函数的强烈演化，特别是我们没有发现大质量星系的SFR下降，如在z < 1时所见。在我们的样本中，质量最大的星系（log M*>11）具有较高的平均SFR值，SFR（UV，corr）= 103+/-75 Msun/yr，但在所有红移处都呈现红色静止坐标系（U-B）颜色。我们的结论是，这些红色的高红移大质量星系中的大多数是红色的，由于尘埃灭绝。我们发现A（2800）随着恒星质量的增加而增加，并表明45%到85%的大质量星系中有尘埃恒星形成。这些结果表明，即使在第一个星系出现后只有几个Gyr，星系的整体物理性质之间也有很强的关系，由恒星质量或与恒星质量密切相关的星系的另一个潜在特征驱动。
英文摘要：
We present a study of the star-forming properties of a stellar mass-selected sample of galaxies in the GOODS NICMOS Survey (GNS), based on deep Hubble Space Telescope imaging of the GOODS North and South fields. Using a stellar mass selected sample, combined with HST/ACS and Spitzer data to measure both UV and infrared derived star formation rates (SFR), we investigate the star forming properties of a complete sample of ~1300 galaxies down to log M*=9.5 at redshifts 1.5<z<3. Eight percent of the sample is made up of massive galaxies with M*>10^11 Msun. We derive optical colours, dust extinctions, and ultraviolet and infrared SFR to determine how the star formation rate changes as a function of both stellar mass and time. Our results show that SFR increases at higher stellar mass such that massive galaxies nearly double their stellar mass from star formation alone over the redshift range studied, but the average value of SFR for a given stellar mass remains constant over this 2 Gyr period. Furthermore, we find no strong evolution in the SFR for our sample as a function of mass over our redshift range of interest, in particular we do not find a decline in the SFR among massive galaxies, as is seen at z < 1. The most massive galaxies in our sample (log M*>11) have high average SFRs with values, SFR(UV,corr) = 103+/-75 Msun/yr, yet exhibit red rest-frame (U-B) colours at all redshifts. We conclude that the majority of these red high-redshift massive galaxies are red due to dust extinction. We find that A(2800) increases with stellar mass, and show that between 45% and 85% of massive galaxies harbour dusty star formation. These results show that even just a few Gyr after the first galaxies appear, there are strong relations between the global physical properties of galaxies, driven by stellar mass or another underlying feature of galaxies strongly related to the stellar mass.
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