Evolution of the galaxy stellar mass function: evidence for an increasing M * from z = 2 to the present day
Evolution of the galaxy stellar mass function: evidence for an increasing M * from z = 2 to the present day
复制标题
星系恒星质量函数的演化：M * 从 z = 2 到现在不断增加的证据
DOI：
10.1093/mnras/stab1956
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发表时间：
2021
影响因子：
4.8
通讯作者：
Adams N
中科院分区：
文献类型：
--
作者：
Adams N
利用光学和近红外宽波段测光技术，在两个研究最多的河外遗留场（COSMOS和XMM-LSS）测量了0.1 <z< 2.0范围内的星系恒星质量函数（GSMF）。我们详细探讨了两种源提取方法（SExtractor和ProFound）以及SpitzerIRAC 3.6和4.5 μm光度法的包含/排除对测量GSMF的影响。我们发现，包括IRAC数据减少了大质量（log 10（M/M）> 11.25）星系的数量，这是由于测光红移精度的提高，但对更多的低质量星系几乎没有影响。我们用双Schechter函数将所得的GSMF拟合到log 10（M/M）= 7.75（9.75）atz= 0.1（2.0），发现源提取软件的选择对导出的最佳拟合参数没有显著影响。然而，用于校正爱丁顿偏差的方法的选择对GSMF的高质量端有更大的影响，这可以部分解释来自先前研究的M * 值的传播。使用经验修正模型的内在GSMF，我们发现证据的演变特征恒星质量与δ log 10（M*/M）/δz=，当使用SExtractor（ProFound）。我们认为，广泛淬火星星的形成率在大质量星系在低红移（z< 0.5），通过合并的额外增长是必需的，以维持这样的演变到一个更高的特征质量。
Utilizing optical and near-infrared broad-band photometry covering >5 deg2in two of the most well-studied extragalactic legacy fields (COSMOS andXMM-LSS), we measure the galaxy stellar mass function (GSMF) between 0.1 <z< 2.0. We explore in detail the effect of two source extraction methods (SExtractor and ProFound) in addition to the inclusion/exclusion ofSpitzerIRAC 3.6 and 4.5 μm photometry when measuring the GSMF. We find that including IRAC data reduces the number of massive (log10(M/M⊙) > 11.25) galaxies found due to improved photometric redshift accuracy, but has little effect on the more numerous lower-mass galaxies. We fit the resultant GSMFs with double Schechter functions down to log10(M/M⊙) = 7.75 (9.75) atz= 0.1 (2.0) and find that the choice of source extraction software has no significant effect on the derived best-fitting parameters. However, the choice of methodology used to correct for the Eddington bias has a larger impact on the high-mass end of the GSMF, which can partly explain the spread in derivedM* values from previous studies. Using an empirical correction to model the intrinsic GSMF, we find evidence for an evolving characteristic stellar mass with δlog10(M*/M⊙)/δz=, when using SExtractor (ProFound). We argue that with widely quenched star formation rates in massive galaxies at low redshift (z< 0.5), additional growth via mergers is required in order to sustain such an evolution to a higher characteristic mass.