arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.04762astro-ph.GA
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用堆积法直接测量HI-晕质量关系

Direct Measurement of the HI-Halo Mass Relation through Stacking

Hong Guo, Michael G. Jones, Martha P. Haynes, Jian Fu

摘要:

我们提出了准确的测量总HI质量的暗物质晕在z ~ 0的不同质量,通过堆叠整个群体的HI光谱从阿雷西博快速遗产ALFA调查。这些晕是从斯隆数字巡天DR 7主星系样本构建的光学星系群目录中选择的,具有可靠的晕质量和晕成员资格测量结果。我们发现,HI晕质量关系是不是一个简单的单调函数,假设在几个理论模型。除了晕质量的依赖性,总HI气体质量表现出强烈的依赖于晕的丰富度,较大的HI质量的组中有更多的成员在固定的晕质量。此外,至少有三个成员星系的晕在组目录中有一个急剧减少的HI质量,可能是由维里晕冲击加热和AGN反馈。HI气体对$M<10^{12.5}h^{-1}M_{\odot}$晕的贡献主要来自中央星系,而卫星星系对更大质量的晕的贡献占主导地位。我们的测量结果是一致的HI丰富的星系形成的三个阶段的情况。平稳的冷气体吸积推动了$M<10^{11.8}h^{-1}M_{\odot}$晕中HI质量的增长,晚期形成的晕具有更多的HI吸积。位力晕激波加热和活动星系核反馈将起到减少$10^{11.8}h^{-1}M_{\odot}<M<10^{13}h^{-1}M_{\odot}$晕中HI供应的作用。在质量比$10^{13}h^{-1}M_{\odot}$大的晕中,HI质量通常会随着并合而增长,对晕丰度的依赖性变得弱得多。

英文摘要:

We present accurate measurements of the total HI mass in dark matter halos of different masses at z ~ 0, by stacking the HI spectra of entire groups from the Arecibo Fast Legacy ALFA Survey. The halos are selected from the optical galaxy group catalog constructed from the Sloan Digital Sky Survey DR7 Main Galaxy sample, with reliable measurements of halo mass and halo membership. We find that the HI-halo mass relation is not a simple monotonic function, as assumed in several theoretical models. In addition to the dependence of halo mass, the total HI gas mass shows strong dependence on the halo richness, with larger HI masses in groups with more members at fixed halo masses. Moreover, halos with at least three member galaxies in the group catalog have a sharp decrease of the HI mass, potentially caused by the virial halo shock-heating and the AGN feedback. The dominant contribution of the HI gas comes from the central galaxies for halos of $M<10^{12.5}h^{-1}M_{\odot}$, while the satellite galaxies dominate over more massive halos. Our measurements are consistent with a three-phase formation scenario of the HI-rich galaxies. The smooth cold gas accretion is driving the HI mass growth in halos of $M<10^{11.8}h^{-1}M_{\odot}$, with late-forming halos having more HI accreted. The virial halo shock-heating and AGN feedback will take effect to reduce the HI supply in halos of $10^{11.8}h^{-1}M_{\odot}<M<10^{13}h^{-1}M_{\odot}$. The HI mass in halos more massive than $10^{13}h^{-1}M_{\odot}$ generally grows by mergers, with the dependence on halo richness becoming much weaker.

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