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arXiv 1509.00482astro-ph.COastro-ph.GA
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连接大质量星系和BOSS - I中的暗物质晕。在大质量晕中星系颜色是随机过程吗?

Connecting massive galaxies to dark matter halos in BOSS - I. Is galaxy color a stochastic process in high-mass halos?

Shun Saito, Alexie Leauthaud, Andrew P. Hearin, Kevin Bundy, Andrew R. Zentner, Peter S. Behroozi, Beth A. Reid, Manodeep Sinha, Jean Coupon, Jeremy L. Tinker, … 展开作者

Shun Saito, Alexie Leauthaud, Andrew P. Hearin, Kevin Bundy, Andrew R. Zentner, Peter S. Behroozi, Beth A. Reid, Manodeep Sinha, Jean Coupon, Jeremy L. Tinker, Martin White, Donald P. Schneider

摘要:

我们使用暗晕丰度匹配(SHAM)来模拟恒星质量函数(SMF)和在$z\sim0.5$的重子振荡光谱巡天(BOSS)“CMASS”样本的聚类。我们介绍了一种新的方法,它占恒星质量的不完整性CMASS作为红移的函数,并产生CMASS模拟目录,其中包括选择效应,再现整体SMF,投影两点关联函数$w_{\rm p}$,CMASS $dn/dz$,并公开提供。我们在“年龄匹配”的背景下研究了坍缩质量以上的组装偏差的影响,并表明这些影响与Hearin等人(2013)在较低恒星质量下探索的影响相比显着不同。我们建立了两个模型,一个是星系颜色是随机的(“AbM”模型),以及一个模型,其中包含组装偏差效应(“AgM”模型)。通过对CMASS的红移相关的聚类与我们模型的预测,我们认为,在高质量晕星系的颜色不是一个随机过程。我们的研究结果表明,在高质量晕的星系的颜色是由其他晕的性质,除了晕的峰值速度和组装偏差的影响起着重要的作用,在确定该样本的集群属性。

英文摘要:

We use subhalo abundance matching (SHAM) to model the stellar mass function (SMF) and clustering of the Baryon Oscillation Spectroscopic Survey (BOSS) "CMASS" sample at $z\sim0.5$. We introduce a novel method which accounts for the stellar mass incompleteness of CMASS as a function of redshift, and produce CMASS mock catalogs which include selection effects, reproduce the overall SMF, the projected two-point correlation function $w_{\rm p}$, the CMASS $dn/dz$, and are made publicly available. We study the effects of assembly bias above collapse mass in the context of "age matching" and show that these effects are markedly different compared to the ones explored by Hearin et al. (2013) at lower stellar masses. We construct two models, one in which galaxy color is stochastic ("AbM" model) as well as a model which contains assembly bias effects ("AgM" model). By confronting the redshift dependent clustering of CMASS with the predictions from our model, we argue that that galaxy colors are not a stochastic process in high-mass halos. Our results suggest that the colors of galaxies in high-mass halos are determined by other halo properties besides halo peak velocity and that assembly bias effects play an important role in determining the clustering properties of this sample.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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