Mergers, starbursts, and quenching in the simba simulation
Mergers, starbursts, and quenching in the simba simulation
复制标题
simba 模拟中的合并、星爆和淬火
DOI:
10.1093/mnras/stz2580
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发表时间:
2019
影响因子:
4.8
通讯作者:
Narayanan, Desika
中科院分区:
文献类型:
--
作者:
Rodríguez Montero, Francisco;Davé, Romeel;Wild, Vivienne;Anglés-Alcázar, Daniel;Narayanan, Desika
We use thesimbacosmological galaxy formation simulation to investigate the relationship between major mergers (4:1), starbursts, and galaxy quenching. Mergers are identified via sudden jumps in stellar massM*well above that expected fromin situstar formation, while quenching is defined as going from specific star formation rate (sSFR)to, wheretHis the Hubble time. Atz≈ 0–3, mergers show ∼2–3× higher SFR than a mass-matched sample of star-forming galaxies, but globally representof the cosmic SF budget. At low masses, the increase in SFR in mergers is mostly attributed to an increase in the H2content, but formergers also show an elevated star formation efficiency suggesting denser gas within merging galaxies. The merger rate for star-forming galaxies shows a rapid increase with redshift, ∝(1 +z)3.5, but the quenching rate evolves much more slowly, ∝(1 +z)0.9; there are insufficient mergers to explain the quenching rate at.simbafirst quenches galaxies at, with a number density in good agreement with observations. The quenching time-scales τqare strongly bimodal, with ‘slow’ quenchings (τq∼ 0.1tH) dominating overall, but ‘fast’ quenchings (τq∼ 0.01tH) dominating inM*∼ 1010–1010.5Mgalaxies, likely induced bysimba’s jet-mode black hole feedback. The delay time distribution between mergers and quenching events suggests no physical connection to either fast or slow quenching. Hence,simbapredicts that major mergers induce starbursts, but are unrelated to quenching in either fast or slow mode.
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DOI:
--
发表时间:
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期刊:
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DOI:
10.1111/j.1365-2966.2011.19306.x
发表时间:
2011-01
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通讯作者:
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