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arXiv 1909.07760astro-ph.GA
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主要的恒星形成星系序列II。高质量端的非演化斜坡

The main sequence of star forming galaxies II. A non evolving slope at the high mass end

P. Popesso, L. Morselli, A. Concas, C. Schreiber, G. Rodighiero, G. Cresci, S. Belli, O. Ilbert, G. Erfanianfar, C. Mancini, H. Inami, M. Dickinson, M. Pannella, D. Elbaz

摘要:

利用CANDELS、GOODS和COSMOS三个观测场的中、远红外观测资料,研究了恒星质量大于10^{10} M_{\odot}的恒星形成星系(SFG)主序(MS)从z~0到~2.5的演化。MS斜率和散射与局部关系和分布的重新标度版本一致,根据~(1+z)^{3.2},在SFR的较高值处发生偏移。该关系表现出弯曲的高质量端和略有增加的散射作为恒星质量的函数。我们表明,以前报道的MS斜率的演变,在所考虑的质量和红移范围内,是由于选择效应。在固定恒星质量的MS区域中,星系的分布在所有的红移和质量下都可以很好地用单一的对数正态分布来表示,在高SFR下,星暴星系(SB)占据尾部。

英文摘要:

By using the deepest available mid and far infrared surveys in the CANDELS, GOODS and COSMOS fields we study the evolution of the Main Sequence (MS) of star forming galaxies (SFGs) from z~0 to` ~2.5 at stellar masses larger than 10^{10} M_{\odot}. The MS slope and scatter are consistent with a re-scaled version of the local relation and distribution, shifted at higher values of SFR according to ~(1+z)^{3.2}. The relation exhibits a bending at the high mass end and a slightly increasing scatter as a function of the stellar mass. We show that the previously reported evolution of the MS slope, in the considered mass and redshift range, is due to a selection effect. The distribution of galaxies in the MS region at fixed stellar mass is well represented by a single log-normal distribution at all redshifts and masses, with starburst galaxies (SBs) occupying the tail at high SFR.

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