The origin of the mass scales for maximal star formation efficiency and quenching: the critical role of supernovae
The origin of the mass scales for maximal star formation efficiency and quenching: the critical role of supernovae
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DOI：
10.1093/mnras/stz577
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发表时间：
2018-09
影响因子：
4.8
通讯作者：
B. Henriques;S. White;S. Lilly;E. Bell;A. Bluck;Bryan A. Terrazas
中科院分区：
文献类型：
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作者：
B. Henriques;S. White;S. Lilly;E. Bell;A. Bluck;Bryan A. Terrazas
我们使用 Henriques 等人。 (2015) 版本的慕尼黑星系形成模型 (L-GALAXIES)，用于研究为什么星系猝灭的光环和恒星质量尺度与红移保持恒定，并且与重子最有效地转化为恒星的尺度一致。该模型假设当热晕气体吸积到超大质量黑洞上时，中央星系会因活动星系核反馈而淬灭。尽管如此，我们发现超新星（SN）反馈决定了这两个质量尺度。当晕超过阈值质量时，超新星不再喷射物质，因此它们的热气体含量增加，从而提高了中心星系的冷却速率、冷气体含量、恒星形成速率和中心黑洞的生长速率。强烈的活动星系核反馈通过抑制恒星形成的燃料供应来终止这个短暂的阶段。尽管晕质量-温度关系的强烈演化，猝灭发生在与红移无关的晕和恒星质量处，这与重子以最大效率转化为恒星的质量一致。这些规律性和巧合是 MCMC 调整模型所选择的特定参数的结果，以适应红移范围 0 上观测到的星系丰度和被动部分
We use the Henriques et al. (2015) version of the Munich galaxy formation model (L-GALAXIES) to investigate why the halo and stellar mass scales above which galaxies are quenched are constant with redshift and coincide with the scale where baryons are most efficiently converted into stars. This model assumes that central galaxies are quenched by AGN feedback when hot halo gas accretes onto a supermassive black hole. Nevertheless, we find that supernova (SN) feedback sets both mass scales. As haloes grow above a threshold mass, SNe can no longer eject material so their hot gas content increases, enhancing the cooling rate onto the central galaxy, its cold gas content, its star formation rate and the growth rate of its central black hole. Strong AGN feedback terminates this short-lived phase by suppressing the fuel supply for star formation. Despite strong evolution of the halo mass - temperature relation, quenching occurs at a redshift-independent halo and stellar mass which coincides with the mass where baryons have been converted into stars with maximal efficiency. These regularities and coincidences are a result of the specific parameters selected by MCMC tuning of the model to fit the observed abundance and passive fraction of galaxies over the redshift range 0