论文标题
弹药后星系的兴起和下降
Rise and fall of post-starburst galaxies in Magneticum Pathfinder
论文作者
论文摘要
恒星后星系（PSB）属于恒星形成（SF）和静态星系之间的短暂过渡人群。解密其大量讨论的进化途径对于理解星系进化至关重要。我们旨在确定田地和星系簇中的PSB演化的主要机制。使用宇宙流体动力模拟套件磁性探路者，我们用$ z \ sim 0识别647 psbs 0 $ stellar质量$ m_* \ geq 5 \ cdot 10^{10} {10} \，\ mathrm {m _ {m _ {\ odot}}} $。我们在3.6Gyr的时间跨度上跟踪他们的银河发展，合并历史和黑洞活动。此外，我们研究在不同的红移和簇质量下鉴定的群集PSB。独立于环境和红移，我们发现PSB和SF星系一样经常合并。在Z = 0时，有89％的PSB经历了合并，而65％的PSB在最后2.5GYR中至少进行了一次主要合并，从而导致了强烈的恒星形成发作。实际上，Z = 0 PSB的23％在他们的Starburst期间恢复活力。在合并之后，通常通过强烈增加AGN反馈（功率输出$ p_ {agn，psb} \ geq 10^{56} \，$ erg/myr）而关闭现场PSB。我们发现与恒星质量函数的观察和Z = 0.9 PSBS在星系簇中的X视线空间分布的一致性一致。最后，我们发现$ z \ Lessim 0.5 $群集PSB主要是在插入的，尤其是在高质量簇中，并且没有增强的AGN活动的迹象。因此，我们得出的结论是，大多数群集PSB都通过环境淬火机制（例如RAM压力剥离）关闭，而野外PSB的主要由AGN反馈淬灭。
Post-starburst galaxies (PSBs) belong to a short-lived transition population between star-forming (SF) and quiescent galaxies. Deciphering their heavily discussed evolutionary pathways is paramount to understanding galaxy evolution. We aim to determine the dominant mechanisms governing PSB evolution in both the field and in galaxy clusters. Using the cosmological hydrodynamical simulation suite Magneticum Pathfinder, we identify 647 PSBs with $z \sim 0$ stellar mass $M_* \geq 5 \cdot 10^{10} \, \mathrm{M_{\odot}}$. We track their galactic evolution, merger history, and black hole activity over a time-span of 3.6Gyr. Additionally, we study cluster PSBs identified at different redshifts and cluster masses. Independent of environment and redshift, we find that PSBs, like SF galaxies, have frequent mergers. At z=0, 89% of PSBs have experienced mergers and 65% had at least one major merger within the last 2.5Gyr, leading to strong star formation episodes. In fact, 23% of z=0 PSBs were rejuvenated during their starburst. Following the mergers, field PSBs are generally shutdown via a strong increase in AGN feedback (power output $P_{AGN,PSB} \geq 10^{56}\,$erg/Myr). We find agreement with observations for both stellar mass functions and z = 0.9 line-of-sight phase space distributions of PSBs in galaxy clusters. Finally, we find that $z \lesssim 0.5$ cluster PSBs are predominantly infalling, especially in high mass clusters and show no signs of enhanced AGN activity. Thus, we conclude that the majority of cluster PSBs are shutdown via an environmental quenching mechanism such as ram-pressure stripping, while field PSBs are mainly quenched by AGN feedback.
