MATCHING THE EVOLUTION OF THE STELLAR MASS FUNCTION USING LOG-NORMAL STAR FORMATION HISTORIES
MATCHING THE EVOLUTION OF THE STELLAR MASS FUNCTION USING LOG-NORMAL STAR FORMATION HISTORIES
复制标题
使用对数正态恒星形成历史来匹配恒星质量函数的演化
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Vulcani
中科院分区：
文献类型：
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作者：
L. Abramson;M. Gladders;A. Dressler;A. Oemler;B. Poggianti;B. Vulcani
我们表明，一个模型组成的个人，对数正态星星形成历史的体积有限的样本z 100星系再现的总和静态恒星质量函数的演变在z 100 2.5和恒星质量M * ≥ 10 10 M？> .这个模型先前已被证明重现星星形成率/恒星质量关系（SFR- M *？>）在相同的时间间隔，是完全一致的宇宙SFR密度在z ≤ 8？>，并不需要明确的“淬火”处方。我们解释这些结果/功能的背景下，其他模型表现出类似的能力，再现（1）宇宙SFR密度的演变，（2）总/静态恒星质量函数，和（3）SFR？> - M *？>关系，提出建模方法之间的关键区别是它们强调/解决（恒星形成）星系人口多样性的程度。最后，我们认为，观察揭示的时间尺度与分散在SFR（M *）？>将有助于确定哪些模型与星系演化最相关。
We show that a model consisting of individual, log-normal star formation histories for a volume-limited sample of z ≈ 0 galaxies reproduces the evolution of the total and quiescent stellar mass functions at z ≲ 2.5 and stellar masses M * ≥ 10 10 M ⊙ ?> . This model has previously been shown to reproduce the star formation rate/stellar mass relation (SFR– M * ?> ) over the same interval, is fully consistent with the observed evolution of the cosmic SFR density at z ≤ 8 ?> , and entails no explicit “quenching” prescription. We interpret these results/features in the context of other models demonstrating a similar ability to reproduce the evolution of (1) the cosmic SFR density, (2) the total/quiescent stellar mass functions, and (3) the SFR ?> – M * ?> relation, proposing that the key difference between modeling approaches is the extent to which they stress/address diversity in the (star-forming) galaxy population. Finally, we suggest that observations revealing the timescale associated with dispersion in SFR ( M * ) ?> will help establish which models are the most relevant to galaxy evolution.