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arXiv 1607.03318astro-ph.GAastro-ph.COastro-ph.HE
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星系性质和环境对中心星系和卫星星系猝灭的影响:SDSS,Illustris和L-Galerkin的比较

The impact of galactic properties and environment on the quenching of central and satellite galaxies: A comparison between SDSS, Illustris and L-Galaxies

Asa F. L. Bluck, J. Trevor Mendel, Sara L. Ellison, David R. Patton, Luc Simard, Bruno M. B. Henriques, Paul Torrey, Hossen Teimoorinia, Jorge Moreno, Else Starkenburg

摘要:

我们量化的影响,各种银河系和环境的属性淬火的恒星形成。我们整理了斯隆数字巡天数据第7版(SDSS DR 7)中的$\sim$ 40万个中央星系和$\sim$ 10万个卫星星系的样本。具体地说,我们考虑了中心速度色散($σ_{c}$),恒星,晕,球和盘质量,局部密度,球对总的比率,集团中心距离和星系晕质量比。我们开发和应用一种新的统计技术来量化的淬火分数($f_{\rm Quench}$)的变化的一个参数的影响,而保持其余的参数固定。对于中心,我们发现,$f_{\rm Quench} - σ_{c}$的关系是紧密和陡峭的比任何其他变量考虑。我们比较的Illustris流体动力学模拟和慕尼黑半解析模型(L-Galerkin),发现我们的结果中心是定性一致的淬火通过无线电模式活动星系核反馈的预测,暗示在这个过程中的可行性,解释我们的观测趋势。然而,我们也发现的证据表明,淬火在L-半乳糖苷是太有效,淬火在插图不够有效,相比观察。对于卫星,我们发现强有力的证据表明,环境影响其淬火分数在固定的中心速度分散,特别是在较低的质量。在更高的质量,卫星的行为完全相同的中心,在他们的淬火。在考虑的环境参数中,在固定的中心速度色散下,局部密度对卫星猝灭分数的影响最大。

英文摘要:

We quantify the impact that a variety of galactic and environmental properties have on the quenching of star formation. We collate a sample of $\sim$ 400,000 central and $\sim$ 100,000 satellite galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Specifically, we consider central velocity dispersion ($σ_{c}$), stellar, halo, bulge and disk mass, local density, bulge-to-total ratio, group-centric distance and galaxy-halo mass ratio. We develop and apply a new statistical technique to quantify the impact on the quenched fraction ($f_{\rm Quench}$) of varying one parameter, while keeping the remaining parameters fixed. For centrals, we find that the $f_{\rm Quench} - σ_{c}$ relationship is tighter and steeper than for any other variable considered. We compare to the Illustris hydrodynamical simulation and the Munich semi-analytic model (L-Galaxies), finding that our results for centrals are qualitatively consistent with their predictions for quenching via radio-mode AGN feedback, hinting at the viability of this process in explaining our observational trends. However, we also find evidence that quenching in L-Galaxies is too efficient and quenching in Illustris is not efficient enough, compared to observations. For satellites, we find strong evidence that environment affects their quenched fraction at fixed central velocity dispersion, particularly at lower masses. At higher masses, satellites behave identically to centrals in their quenching. Of the environmental parameters considered, local density affects the quenched fraction of satellites the most at fixed central velocity dispersion.

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