论文标题
来自候选中间质量黑洞的快速上升潮汐破坏事件
A fast rising tidal disruption event from a candidate intermediate mass black hole
论文作者
论文摘要
大型星系中心的大孔（BHS）无处不在。另一方面，矮星系中的BHS人口是回避的。矮星系被认为具有成比例小的质量，包括中间质量BHS，质量为$ 10^{2} <m_ {bh} <10^{6} m _ {\ odot} $。从历史上看，这些系统的识别依赖于从BHS接近的气体盘发出的光中检测到的光。没有这种光，它们就很难以检测。潮汐破坏事件（TDES），即当恒星流浪接近BH并切碎时产生的发光耀斑，是探测大量BHS的直接方法。这些耀斑的上升时间理论上与BH质量相关。在这里，我们介绍了由矮星银河（Dwarf Galaxy）主持的快速上升的TDE候选人AT2020NEH。 AT2020NEH可以通过10 $^{4.7} -10^{5.9} m _ {\ odot} $ BH来描述主序列星的潮汐破坏。我们发现诸如AT2020NEH之类的快速上升核瞬变的可观察率很少见，以$ \ Lessim 2 \ times 10^{ - 8} $ events mpc $^{ - 3} $ yr $^{ - 1} $。在矮星系中找到非良好的BHS对于确定这些星系中普遍存在的BHS和约束BH形成模型很重要。 AT2020NEH样事件可能会提供与星系无关的测量IMBH质量的方法。
Massive black holes (BHs) at the centres of massive galaxies are ubiquitous. The population of BHs within dwarf galaxies, on the other hand, is evasive. Dwarf galaxies are thought to harbour BHs with proportionally small masses, including intermediate mass BHs, with masses $10^{2} < M_{BH} < 10^{6} M_{\odot}$. Identification of these systems has historically relied upon the detection of light emitted from accreting gaseous discs close to the BHs. Without this light, they are difficult to detect. Tidal disruption events (TDEs), the luminous flares produced when a star strays close to a BH and is shredded, are a direct way to probe massive BHs. The rise times of these flares theoretically correlate with the BH mass. Here we present AT2020neh, a fast rising TDE candidate, hosted by a dwarf galaxy. AT2020neh can be described by the tidal disruption of a main sequence star by a 10$^{4.7} - 10^{5.9} M_{\odot}$ BH. We find the observable rate of fast rising nuclear transients like AT2020neh to be rare, at $\lesssim 2 \times 10^{-8}$ events Mpc$^{-3}$ yr$^{-1}$. Finding non-accreting BHs in dwarf galaxies is important to determine how prevalent BHs are within these galaxies, and constrain models of BH formation. AT2020neh-like events may provide a galaxy-independent method of measuring IMBH masses.
