AGN feedback in dwarf galaxies?
AGN feedback in dwarf galaxies?
复制标题
矮星系中的 AGN 反馈？
DOI：
10.1093/mnras/stx2716
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发表时间：
2018
影响因子：
4.8
通讯作者：
Tilman
中科院分区：
文献类型：
--
作者：
Dashyan;G.;Silk;J.;Mamon;G.;Dubois;Y.;Hartwig;Tilman
矮星系的异常现象，如它们的丰度和尖核问题，仍然是我们理解星系形成的主要挑战。包含重子物理学可能解决这些问题，但恒星反馈的效率仍然存在争议。本文分析了矮星系中活动星系核反馈的可能性，并比较了活动星系核反馈和超新星反馈。我们假设存在一个中等质量的黑洞在低质量的星系和相关的物理量之间的标准标度关系。我们模拟了外流的传播和性质，并探讨了全球气体喷射的临界条件。对SNe进行同样的计算，我们比较了活动星系核和SNe将气体赶出星系的能力。我们发现，存在一个临界晕质量低于AGN的反馈可以从主机晕中去除气体，并为AGN的临界晕质量是大于相当于SNe在一个显着的部分参数空间，这表明AGN可以提供一个替代和更成功的源比SNe的负反馈，即使在最大的矮星系。
Dwarf galaxy anomalies, such as their abundance and cusp-core problems, remain a prime challenge in our understanding of galaxy formation. The inclusion of baryonic physics could potentially solve these issues, but the efficiency of stellar feedback is still controversial. We analytically explore the possibility of feedback from active galactic nuclei (AGNs) in dwarf galaxies and compare AGN and supernova (SN) feedback. We assume the presence of an intermediate-mass black hole within low-mass galaxies and standard scaling relations between the relevant physical quantities. We model the propagation and properties of the outflow and explore the critical condition for global gas ejection. Performing the same calculation for SNe, we compare the ability of AGNs and SNe to drive gas out of galaxies. We find that a critical halo mass exists below which AGN feedback can remove gas from the host halo and that the critical halo mass for an AGN is greater than the equivalent for SNe in a significant part of the parameter space, suggesting that an AGN could provide an alternative and more successful source of negative feedback than SNe, even in the most massive dwarf galaxies.