SWIRE-VVDS-CFHTLS巡天：过去10千兆年的恒星质量聚集。红色序列在z=2和z=1之间主要积累的证据
The SWIRE-VVDS-CFHTLS surveys: stellar mass assembly over the last 10 Gyears. Evidence for a major build up of the red sequence between z=2 and z=1
摘要：
摘要：我们用一个3.6 $μ$的大样本分析了过去10个Gyrs的恒星质量增长。我们将样本分为活动（蓝色）和静止（红色）星系。我们对K-LF和LD演化的测量支持了这样一种观点，即大部分星系已经在$z\sim 1.2$聚集。基于对光谱子样本的恒星质光比（K波段）演化的分析，我们推导出了整个样本的恒星质量密度。我们发现，恒星质量密度的全球演化是由恒星形成率来自紫外尘埃校正测量再现。在过去的8 Gyrs，我们观察到，恒星的质量密度的活动人口保持近似恒定，而它逐渐增加的静态人口在同一时间尺度。因此，静止星群中恒星质量的增长必然是由于迁移到静止星群中的活动星系中恒星形成的停止。从$z=2$到$z=1.2$，我们观察到一个主要的静态人口增加了10倍的恒星质量，这表明我们正在观察的时代时，越来越多的星系正在结束他们的恒星形成活动，并开始建立红色序列。
英文摘要：
(abridged abstract) We present an analysis of the stellar mass growth over the last 10 Gyrs using a large 3.6$μ$ selected sample. We split our sample into active (blue) and quiescent (red) galaxies. Our measurements of the K-LFs and LD evolution support the idea that a large fraction of galaxies is already assembled at $z\sim 1.2$. Based on the analysis of the evolution of the stellar mass-to-light ratio (in K-band) for the spectroscopic sub-sample, we derive the stellar mass density for the entire sample. We find that the global evolution of the stellar mass density is well reproduced by the star formation rate derived from UV dust corrected measurements. Over the last 8Gyrs, we observe that the stellar mass density of the active population remains approximately constant while it gradually increases for the quiescent population over the same timescale. As a consequence, the growth of the stellar mass in the quiescent population must be due to the shutoff of star formation in active galaxies that migrate into the quiescent population. From $z=2$ to $z=1.2$, we observe a major build-up of the quiescent population with an increase by a factor of 10 in stellar mass, suggesting that we are observing the epoch when an increasing fraction of galaxies are ending their star formation activity and start to build up the red sequence.
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