arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2310.03083astro-ph.GA
收藏

IllustrisTNG宇宙学模拟中 z ≳ 3 大质量星系恒星形成熄灭的起源

On the origin of star formation quenching in massive galaxies at $z \gtrsim 3$ in the cosmological simulations IllustrisTNG

Shalini Kurinchi-Vendhan, Marion Farcy, Michaela Hirschmann, Francesco Valentino

AI总结:

基于 IllustrisTNG 模拟研究 z ≳ 3 大质量星系的早期熄灭机制,发现 AGN 动力学喷流反馈是主因,大尺度环境仅通过影响黑洞增长产生温和作用。

摘要:

利用 IllustrisTNG 宇宙学模拟,我们对 z ≳ 3 处的宁静大质量星系进行了全面分析。目标是理解是什么在宇宙时间如此早期抑制了它们的恒星形成,以及其他质量相近的星系如何仍保持高恒星形成率。作为一个一阶结果,这些模拟能够在这一高红移区间产生大质量的宁静星系。我们发现活动星系核(AGN)反馈是阻止早期大质量星系恒星形成的主要原因。熄灭星系中心的超大质量黑洞(SMBH)不仅具有更早的种子形成时间,而且比恒星形成星系中的黑洞增长得更快。因此,熄灭星系暴露于 AGN 反馈的时间更长,并且比恒星形成星系更早经历 AGN 反馈的动力学喷流模式。动能的释放减少了气体流入,同时可能维持外流,这使冷气体比例保持在较低水平,并将星系的恒星形成降低至宁静状态。除 AGN 反馈外,我们还研究了大尺度环境的影响。虽然并合在熄灭过程中并未发挥显著作用,但熄灭星系在演化过程中往往位于质量更大的晕和更致密的区域。由于这为星系提供了更大量的初始下落气体,大尺度环境能够温和地影响中心 SMBH 增长的命运,并通过 AGN 反馈促进恒星形成熄灭。

英文摘要:

Using the cosmological simulations IllustrisTNG, we perform a comprehensive analysis of quiescent, massive galaxies at $z \gtrsim 3$. The goal is to understand what suppresses their star formation so early in cosmic time, and how other similar mass galaxies remain highly star-forming. As a first-order result, the simulations are able to produce massive, quiescent galaxies in this high-redshift regime. We find that active galactic nuclei (AGN) feedback is the primary cause of halting star formation in early, massive galaxies. Not only do the central, supermassive black holes (SMBHs) of the quenched galaxies have earlier seed times, but they also grow faster than in star-forming galaxies. As a result, the quenched galaxies are exposed to AGN feedback for longer, and experience the kinetic, jet-mode of the AGN feedback earlier than the star-forming galaxies. The release of kinetic energy reduces inflows of gas while likely maintaining outflows, which keeps a low cold gas fraction and decreases the star formation of the galaxies down to a state of quiescence. In addition to AGN feedback, we also investigate the influence of the large-scale environment. While mergers do not play a significant role in the quenching process, the quenched galaxies tend to reside in more massive halos and denser regions during their evolution. As this provides a greater initial amount of infalling gas to the galaxies, the large-scale environment can mildly affect the fate of the central SMBH growth and, via AGN feedback, contribute to star formation quenching.

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。

↑