The GOGREEN survey: transition galaxies and the evolution of environmental quenching

The GOGREEN survey: transition galaxies and the evolution of environmental quenching
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GOGREEN 调查:过渡星系和环境猝灭的演化

DOI:
10.1093/mnras/stab2558
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发表时间:
2021
影响因子:
4.8
通讯作者:
McGee, Sean
McGee, Sean
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
McNab, Karen;Balogh, Michael L;van der Burg, Remco F;Forestell, Anya;Webb, Kristi;Vulcani, Benedetta;Rudnick, Gregory;Muzzin, Adam;Cooper, M C;McGee, Sean

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我们使用来自 GOGREEN 样本的 11 个跨越红移范围 1.0 <z< 1.4 的大质量 () 星系团,测量了 atz∼1 星系中环境驱动的恒星形成猝灭率。我们确定了三种不同类型的过渡星系:“绿谷”(GV)星系从其静止框架(NUV−V)和(V−J)颜色中识别出来; “蓝色静止”(BQ)星系,发现于静止序列的蓝色末端,颜色为(U−V)和(V−J);和光谱后星暴(PSB)星系。我们根据恒星质量和环境来测量这些星系的丰度。对于高恒星质量星系(logM/M⊙> 10.5),相对于相同红移的比较场样本,我们没有发现星团中有任何明显过量的过渡星系。这些星系很可能在它们在星团、群、丝状或原星团环境中吸积之前就被淬灭了。对于较低恒星质量的星系(9.5 < logM/M⊙< 10.5),星团中存在少量但显着过量的过渡星系,与场相比,占总数量的 ∼5-10%。我们的数据表明,我们的数据与这样一种情况是一致的,即星团中 20-30% 的低质量恒星形成星系每 Gyr 都会受到环境猝灭,并且该速率从 z= 1 缓慢下降到 z= 0。虽然这些星系的环境猝灭可能包括恒星形成缓慢下降的较长延迟时间,但在大多数情况下,这必须以恒星形成速率的快速 (τ < 1 Gyr) 下降而结束。
We measure the rate of environmentally driven star formation quenching in galaxies atz∼ 1, using eleven massive () galaxy clusters spanning a redshift range 1.0 <z< 1.4 from the GOGREEN sample. We identify three different types of transition galaxies: ‘green valley’ (GV) galaxies identified from their rest-frame (NUV−V) and (V−J) colours; ‘blue quiescent’ (BQ) galaxies, found at the blue end of the quiescent sequence in (U−V) and (V−J) colour; and spectroscopic post-starburst (PSB) galaxies. We measure the abundance of these galaxies as a function of stellar mass and environment. For high-stellar mass galaxies (logM/M⊙> 10.5) we do not find any significant excess of transition galaxies in clusters, relative to a comparison field sample at the same redshift. It is likely that such galaxies were quenched prior to their accretion in the cluster, in group, filament, or protocluster environments. For lower stellar mass galaxies (9.5 < logM/M⊙< 10.5) there is a small but significant excess of transition galaxies in clusters, accounting for an additional ∼5–10 per cent of the population compared with the field. We show that our data are consistent with a scenario in which 20–30 per cent of low-mass, star-forming galaxies in clusters are environmentally quenched every Gyr, and that this rate slowly declines fromz= 1 toz= 0. While environmental quenching of these galaxies may include a long delay time during which star formation declines slowly, in most cases this must end with a rapid (τ < 1 Gyr) decline in star formation rate.
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发表时间: 2017
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