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arXiv 1707.06264astro-ph.GA
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星系群和星系团中恒星质量的损失

On stellar mass loss from galaxies in groups and clusters

Édouard Tollet, Andrea Cattaneo, Gary Mamon, Thibaud Moutard, Frank van den Bosch

摘要:

我们估计卫星星系失去的恒星质量,一旦他们进入组(和集群),通过识别组在高分辨率的宇宙学N体模拟,分配进入质量的卫星星系与晕丰度匹配在进入时间,并比较预测的条件恒星质量函数的卫星星系在$z\simeq0$与观测。我们的结果取决于进入时间后在卫星星系中形成的恒星的质量。一个星系一旦进入星系群环境,恒星形成就完全停止的模型被排除了,因为它低估了卫星星系的恒星质量,即使在没有潮汐剥离的情况下。允许形成的恒星质量越大,需要潮汐剥离的部分就越大。卫星星系进入星系团或星系团环境后损失的恒星质量分数与$0-40\%$范围内的任何值一致。要放置更强的约束,我们认为一个更精细的模型潮汐剥离的星系在细长的轨道(剥离发生在轨道近心点)。我们的模型预测潮汐剥离较少:卫星星系失去$\sim 20-25\%$的恒星质量,因为他们进入集团。这一发现与缓慢饥饿延迟淬火的图像是一致的,在这种图像中,进入星系团或星系团环境的星系一直在形成恒星,直到至少第一次近心通过。

英文摘要:

We estimate the stellar mass that satellite galaxies lose once they enter groups (and clusters) by identifying groups in a high-resolution cosmological N-body simulation, assigning entry masses to satellite galaxies with halo abundance matching at the entry time, and comparing the predicted conditional stellar mass function of satellite galaxies at $z\simeq0$ with observations. Our results depend on the mass of the stars that form in satellite galaxies after the entry time. A model in which star formation shuts down completely as soon a galaxy enters a group environment is ruled out because it underpredicts the stellar masses of satellite galaxies even in the absence of tidal stripping. The greater is the stellar mass that is allowed to form, the greater the fraction that needs to be tidally stripped. The stellar mass fraction lost by satellite galaxies after entering a group or cluster environment is consistent with any value in the range $0-40\%$. To place stronger constraints, we consider a more refined model of tidal stripping of galaxies on elongated orbits (where stripping occurs at orbit pericentres). Our model predicts less tidal stripping: satellite galaxies lose $\sim 20-25\%$ of their stellar mass since their entry into the group. This finding is consistent with a slow-starvation delayed-quenching picture, in which galaxies that enter a group or cluster environment keep forming stars until at least the first pericentric passage.

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