Evolution of the cold gas properties of simulated post-starburst galaxies

Evolution of the cold gas properties of simulated post-starburst galaxies
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模拟星暴后星系冷气体特性的演化

DOI:
10.1093/mnras/stz180
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发表时间:
2019
影响因子:
4.8
通讯作者:
Davis T
Davis T
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Davis T

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星暴后的星系通常被认为是一个过渡族群,在最近的一次猝灭事件后,正在前往红色序列。尽管如此,最近的观测表明,这些物体通常具有大量的冷分子气体。在本文中,我们研究了恒星形成气体的性质的一个大样本的后星爆星系的宇宙学,流体动力学EAGLE模拟选择。这些天体在光谱上和空间密度、恒星质量分布和大小方面都类似于观测到的大质量星暴后星系。我们发现,绝大多数模拟后星爆星系有显着的气体水库,与恒星形成的气体质量为109 M <$,在观测样本中看到的很好的协议。该模拟再现了观测到的星暴后星系群中气体部分的时间演化,平均每个星系仅在1.6亿年内就失去了90%的恒星形成星际介质。各种各样的气体消耗/损失过程是造成这种快速演化的原因,包括合并和环境影响,而活动星系核只起次要作用。星暴后星系气体组分的快速演化伴随着致密气体组分的减少而导致星星形成效率的明显降低。我们预测,即将到来的阿尔马观测的气体水库的低红移后星暴星系将表明,分子气体通常是紧凑的,并扰乱了运动学,反映了破坏性的性质的许多演化途径,建立了后星暴星系人口。
Post-starburst galaxies are typically considered to be a transition population, en route to the red sequence after a recent quenching event. Despite this, recent observations have shown that these objects typically have large reservoirs of cold molecular gas. In this paper we study the star-forming gas properties of a large sample of post-starburst galaxies selected from the cosmological, hydrodynamical EAGLE simulations. These objects resemble observed high-mass post-starburst galaxies both spectroscopically and in terms of their space density, stellar mass distribution, and sizes. We find that the vast majority of simulated post-starburst galaxies have significant gas reservoirs, with star-forming gas masses ≈109M⊙, in good agreement with those seen in observational samples. The simulation reproduces the observed time evolution of the gas fraction of the post-starburst galaxy population, with the average galaxy losing ≈90 per cent of its star-forming interstellar medium in only ≈600 Myr. A variety of gas consumption/loss processes are responsible for this rapid evolution, including mergers and environmental effects, while active galactic nuclei play only a secondary role. The fast evolution in the gas fraction of post-starburst galaxies is accompanied by a clear decrease in the efficiency of star formation due to a decrease in the dense gas fraction. We predict that forthcoming ALMA observations of the gas reservoirs of low-redshift post-starburst galaxies will show that the molecular gas is typically compact and has disturbed kinematics, reflecting the disruptive nature of many of the evolutionary pathways that build up the post-starburst galaxy population.
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