论文标题
通过合并和AGN磁盘中的下部质量间隙中的黑洞形成
Black Hole Formation in the Lower Mass Gap through Mergers and Accretion in AGN Disks
论文作者
论文摘要
最重的中子星和最轻的黑洞预计将由恒星进化产生，使质量范围$ 2.2 $ m $ _ {\ odot} \ Lessim m \ Lessim M \ Lessim 5 $ m $ _ \ odot $在很大程度上没有被人群。在这个所谓的较低质量间隙中发现的物体可能起源于不同的天体物理过程。最近在二进制合并GW190814中通过Ligo/Virgo的重力波在二进制合并GW190814中检测到了这种物体，$ 2.6 $ m $ _ \ odot $。在这里，我们表明，质量间隙中的黑洞自然是通过合并和AGN磁盘中的积聚来组装的，随后可以参与其他合并。我们计算涉及中子星和黑洞的AGN辅助合并的特性，这是造成积聚的。我们发现，其中一个物体位于较低的质量差距中的合并代表了Ligo/Idgo可检测到的AGN辅助合并的$ 4 $ 4％。 GW190814的较轻对象，质量为$ 2.6 $ m $ _ \ odot $，可以通过积聚在AGN磁盘中生长。我们发现，在中子星合并GW190425中观察到的出乎意料的高总质量为3.4 m $ _ \ odot $也可能是由于AGN磁盘中的积聚。
The heaviest neutron stars and lightest black holes expected to be produced by stellar evolution leave the mass-range $2.2$ M$_{\odot}\lesssim m \lesssim 5$ M$_\odot$ largely unpopulated. Objects found in this so-called lower mass gap likely originate from a distinct astrophysical process. Such an object, with mass $2.6$ M$_\odot$ was recently detected in the binary merger GW190814 through gravitational waves by LIGO/Virgo. Here we show that black holes in the mass gap are naturally assembled through mergers and accretion in AGN disks, and can subsequently participate in additional mergers. We compute the properties of AGN-assisted mergers involving neutron stars and black holes, accounting for accretion. We find that mergers in which one of the objects is in the lower mass gap represent up to $4$% of AGN-assisted mergers detectable by LIGO/Virgo. The lighter object of GW190814, with mass $2.6$ M$_\odot$, could have grown in an AGN disk through accretion. We find that the unexpectedly high total mass of 3.4 M$_\odot$ observed in the neutron star merger GW190425 may also be due to accretion in an AGN disk.
