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arXiv 1509.07418astro-ph.GA
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恒星质量函数的质量端

The Massive End of the Stellar Mass Function

R. D'Souza, S. Vegetti, G. Kauffmann

摘要:

我们推导出平均通量修正的\texttt{Model}的斯隆数字巡天(SDSS)星系的星等堆叠在一起的马赛克类似的星系在箱子的恒星质量和浓度。额外的通量被检测到在外部低表面亮度的星系的一部分,导致从0.05至0.32等的最高恒星质量的星系的修正。我们将这些修正应用于MPA-JHU(约翰霍普金斯大学马克斯普朗克天体物理研究所)恒星质量的完整样本的50万个星系的SDSS调查,以获得一个校正的星系恒星质量函数在$z=0.1$在恒星质量范围$9.5<\log(M_\ast/M_\odot)<12.0$。我们发现,通量修正和MPA-JHU恒星质量的使用对恒星质量函数的质量端有显著影响,使得斜率比Li \& White(2009)估计的要小得多,但比Bernardi等人(2013)推导的要陡。这对应于恒星质量为$\log(M_\ast/M_\odot) \ge 11.0$的星系的平均同向恒星质量密度,比Li \& White(2009)的估计大3.36倍,但比Bernardi等人(2013)的报告小43%。

英文摘要:

We derive average flux corrections to the \texttt{Model} magnitudes of the Sloan Digital Sky Survey (SDSS) galaxies by stacking together mosaics of similar galaxies in bins of stellar mass and concentration. Extra flux is detected in the outer low surface brightness part of the galaxies, leading to corrections ranging from 0.05 to 0.32 mag for the highest stellar mass galaxies. We apply these corrections to the MPA-JHU (Max-Planck Institute for Astrophysics - John Hopkins University) stellar masses for a complete sample of half a million galaxies from the SDSS survey to derive a corrected galaxy stellar mass function at $z=0.1$ in the stellar mass range $9.5<\log(M_\ast/M_\odot)<12.0$. We find that the flux corrections and the use of the MPA-JHU stellar masses have a significant impact on the massive end of the stellar mass function, making the slope significantly shallower than that estimated by Li \& White (2009), but steeper than derived by Bernardi et al. (2013). This corresponds to a mean comoving stellar mass density of galaxies with stellar masses $\log(M_\ast/M_\odot) \ge 11.0$ that is a factor of 3.36 larger than the estimate by Li \& White (2009), but is 43\% smaller than reported by Bernardi et al. (2013).

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