The role of mass and environment in the build-up of the quenched galaxy population since cosmic noon
The role of mass and environment in the build-up of the quenched galaxy population since cosmic noon
复制标题
自宇宙正午以来质量和环境在猝灭星系种群形成过程中的作用
DOI：
10.1093/mnras/stad1098
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发表时间：
2023
影响因子：
4.8
通讯作者：
Taylor E
中科院分区：
文献类型：
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作者：
Taylor E
我们利用UKIDSS超深巡天的数据，首次研究了星系的相对猝灭概率在红移范围0.5 <z< 3内如何依赖于环境。通过构造高、中、低密度环境中静止星系和星暴后星系的恒星质量函数，我们发现在稠密环境中至少有2个猝灭星系。利用淬灭星系数量的增长率，结合恒星形成星系的质量函数，我们计算了给定恒星形成星系在单位时间内淬灭的概率。我们发现一个显着更高的淬火率在稠密的环境（在一个给定的恒星质量）在所有的红移。大质量星系（M*> 1010.7M）在三分之一的环境中，每Gyr的猝灭可能性平均是三分之一的环境中的1.7 ± 0.2倍。最后，我们比较了静止星系的增长率，星系通过PSB阶段的速度。假设可见时间尺度为5亿年，我们发现PSB路径可以解释红移范围0.5 <z< 3的高恒星质量（M*> 1010.7M）的静止星群增长的50%，以及可能的所有低恒星质量的增长。
We conduct the first study of how the relative quenching probability of galaxies depends on environment over the redshift range 0.5 <z< 3, using data from the UKIDSS Ultra Deep Survey. By constructing the stellar mass functions for quiescent and post-starburst (PSB) galaxies in high-, medium-, and low-density environments toz= 3, we find an excess of quenched galaxies in dense environments out to at leastz∼ 2. Using the growth rate in the number of quenched galaxies, combined with the star-forming galaxy mass function, we calculate the probability that a given star-forming galaxy is quenched per unit time. We find a significantly higher quenching rate in dense environments (at a given stellar mass) at all redshifts. Massive galaxies (M*> 1010.7M⊙) are on average 1.7 ± 0.2 times more likely to quench per Gyr in the densest third of environments compared to the sparsest third. Finally, we compare the quiescent galaxy growth rate to the rate at which galaxies pass through a PSB phase. Assuming a visibility time-scale of 500 Myr, we find that the PSB route can explain ∼50 per cent of the growth in the quiescent population at high stellar mass (M*> 1010.7M⊙) in the redshift range 0.5 <z< 3, and potentially all of the growth at lower stellar masses.