MOIRCS深度调查。VIII。星系中恒星形成活动随恒星质量变化的演化
MOIRCS Deep Survey. VIII. Evolution of Star Formation Activity as a Function of Stellar Mass in Galaxies since z~3
摘要：
利用Subaru望远镜在GOODS-North区域的多目标红外相机和摄谱仪（MOIRCS）获得的甚深近红外数据，研究了0.5 <z <3.5星系的恒星形成活动随恒星质量的演化。近红外成像数据达到K~23 - 24织女星等，它们使我们能够构建一个接近恒星质量限制的样本，即使在z~3下也可以达到~10 ^{9.5 - 10} Msun。我们用Spitzer/MIPS 24um光通量和静止框架2800A光度两个指标估算了样品的恒星形成率。在0.5 <z~1处，随着红移的增加，固定M星处的SFR分布向更高的值移动。<3.5. More massive galaxies show stronger evolution of SFR at z>我们发现2.5 <z <3.5的星系在SSFR分布中表现出双峰性，可以通过~2 Gyr ^{-1}的恒定SSFR将其分为两个种群。低SSFR群体中的半乳糖苷酶的SSFR约为0.5 - 1.0 Gyr ^{-1}，而高SSFR群体显示约10 Gyr ^{-1}。在0.5 <z <3.5时，Mstar = 10 ^{10 - 11} Msun的星系占主导地位，而Mstar = 10 ^{11 - 11.5} Msun的大质量星系的贡献在z> 1时表现出强烈的演化，在z~3时变得显著，特别是在基于MIPS 24 μ m的SFR中。在Mstar = 10 ^{10 - 11.5} Msun的星系中，那些SSFR范围相对较窄（<~1 dex）的星系在0.5 <z <3.5处主导宇宙SFRD。主导SFRD的星系的SSFR随红移系统地增加。在2.5 <z <3.5时，数量相对较少的高SSFR群体主导SFRD。宇宙中的主要恒星形成在较高的红移似乎与星系的恒星质量的更快速的增长。
英文摘要：
We study the evolution of star formation activity of galaxies at 0.5<z<3.5 as a function of stellar mass, using very deep NIR data taken with Multi-Object Infrared Camera and Spectrograph (MOIRCS) on the Subaru telescope in the GOODS-North region. The NIR imaging data reach K ~ 23-24 Vega magnitude and they allow us to construct a nearly stellar mass-limited sample down to ~ 10^{9.5-10} Msun even at z~3. We estimated star formation rates (SFRs) of the sample with two indicators, namely, the Spitzer/MIPS 24um flux and the rest-frame 2800A luminosity. The SFR distribution at a fixed Mstar shifts to higher values with increasing redshift at 0.5<z<3.5. More massive galaxies show stronger evolution of SFR at z>~1. We found galaxies at 2.5<z<3.5 show a bimodality in their SSFR distribution, which can be divided into two populations by a constant SSFR of ~2 Gyr^{-1}. Galaxies in the low-SSFR group have SSFRs of ~ 0.5-1.0 Gyr^{-1}, while the high-SSFR population shows ~10 Gyr^{-1}. The cosmic SFRD is dominated by galaxies with Mstar = 10^{10-11} Msun at 0.5<z<3.5, while the contribution of massive galaxies with Mstar = 10^{11-11.5} Msun shows a strong evolution at z>1 and becomes significant at z~3, especially in the case with the SFR based on MIPS 24um. In galaxies with Mstar = 10^{10-11.5} Msun, those with a relatively narrow range of SSFR (<~1 dex) dominates the cosmic SFRD at 0.5<z<3.5. The SSFR of galaxies which dominate the SFRD systematically increases with redshift. At 2.5<z<3.5, the high-SSFR population, which is relatively small in number, dominates the SFRD. Major star formation in the universe at higher redshift seems to be associated with a more rapid growth of stellar mass of galaxies.
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