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arXiv 1902.02779astro-ph.GA
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$z = 1.2$以来星系质量函数和红外光度函数的演化

Evolution of the Stellar Mass Function and Infrared Luminosity Function of Galaxies since $z = 1.2$

Richard Beare, Michael Brown, Kevin Pimbblet, Edward Taylor

摘要:

我们测量了在$z<1.2$的红星系和蓝星系的$K$波段光度函数和恒星质量函数的演化,使用的样本是8.26平方度的牧夫座中的353594个$I<24$星系。我们解决了几个来源的系统和随机误差的测量总星系光,光度红移和绝对星等。我们发现,从$z\sim1.1$到$z\sim0.3$,红色和蓝色星系的$K$波段光度密度都增加了1.2倍,而最亮的红(蓝)星系的光度减少了0.19(0.33)等或$\times0.83 (0.74)$。这些结果是一致的$z<0.2$研究,而我们的大样本量和面积的结果在较小的泊松和宇宙方差的不确定性比大多数$z >0.4$光度和质量函数测量。利用$K$带质量与光的比值随$(B-V)$颜色变化的演化关系,我们发现从$z\sim1.1$到$z\sim0.3$,红色星系恒星质量密度$\times2.3$的增长率缓慢下降,表明从蓝色星云到红色星云的迁移率缓慢下降.与一些恒星质量函数的研究不同,我们发现大质量红星系从$z\sim1.1$到$z\sim0.3$的增长率为$\times1.7$,由于合并的增长率随时间而降低。这些结果是可比的合并率和集群的测量,他们也是一致的,通过比较$K$波段光度演化与被动恒星种群模型的衰落暗示的红星系恒星质量增长。

英文摘要:

We measured evolution of the $K$-band luminosity function and stellar mass function for red and blue galaxies at $z<1.2$ using a sample of 353 594 $I<24$ galaxies in 8.26 square degrees of Boötes. We addressed several sources of systematic and random error in measurements of total galaxy light, photometric redshift and absolute magnitude. We have found that the $K$-band luminosity density for both red and blue galaxies increased by a factor of 1.2 from $z\sim1.1$ to $z\sim0.3$, while the most luminous red (blue) galaxies decreased in luminosity by 0.19 (0.33) mag or $\times0.83 (0.74)$. These results are consistent with $z<0.2$ studies while our large sample size and area result in smaller Poisson and cosmic variance uncertainties than most $z >0.4$ luminosity and mass function measurements. Using an evolving relation for $K$-band mass to light ratios as a function of $(B-V)$ color, we found a slowly decreasing rate of growth in red galaxy stellar mass density of $\times2.3$ from $z\sim1.1$ to $z\sim0.3$, indicating a slowly decreasing rate of migration from the blue cloud to the red sequence. Unlike some studies of the stellar mass function, we find that massive red galaxies grow by a factor of $\times1.7$ from $z\sim1.1$ to $z\sim0.3$, with the rate of growth due to mergers decreasing with time. These results are comparable with measurements of merger rates and clustering, and they are also consistent with the red galaxy stellar mass growth implied by comparing $K$-band luminosity evolution with the fading of passive stellar population models.

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