论文标题
明亮的中央星系中的中心超级质量黑洞
Off-centre supermassive black holes in bright central galaxies
论文作者
论文摘要
据信，超大的黑洞（SMBH）居住在大型星系中心，例如最明亮的簇星系（BCG）。但是，由于BCG在整个历史上经历了许多银河合并，因此中央BH可以通过这些动态遭遇从中央地区大大踢出。通过将Illustris-TNG300模拟和轨道整合结合在一起，我们证明了在径向轨道上与卫星星系的合并是BCG中此类BH位移的主要驱动力。 BHS可以驱逐到几个parsec到数百千甲糖之间的距离。我们的结果清楚地表明，SMBH偏移量在BCG中很常见，更确切地说，我们的BHS中有三分之一在$ z = 0 $中不偏置。在我们BCG的一半中，这种轨道偏移可以维持至少6个Gyr。由于稠密的气体储层位于星系中部地区，因此我们认为BCG中中心SMBH的后果是消除任何BH增长和BH的反馈。
Supermassive black holes (SMBHs) are believed to reside at the centre of massive galaxies such as brightest cluster galaxies (BCGs). However, as BCGs experienced numerous galaxy mergers throughout their history, the central BH can be significantly kicked from the central region by these dynamical encounters. By combining the Illustris-TNG300 simulations and orbital integrations, we demonstrate that mergers with satellite galaxies on radial orbits are a main driver for such BH displacements in BCGs. BHs can get ejected to distances varying between a few parsecs to hundreds of kiloparsecs. Our results clearly establish that SMBH offsets are common in BCGs and more precisely a third of our BHs are off-centred at $z=0$. This orbital offset can be sustained for up to at least 6 Gyr between $z=2$ and $z=0$ in half of our BCGs. Since the dense gas reservoirs are located in the central region of galaxies, we argue that the consequences of off-center SMBHs in BCGs are to quench any BH growth and BH feedback.
