标题： 关于LIGO-Virgo-KAGRA事件的质谱分布 显示英文标题

标题： On the mass distribution of the LIGO-Virgo-KAGRA events

摘要： 由LIGO-Virgo-KAGRA（LVK）引力波观测台探测到的合并黑洞双星，可能有助于我们了解此类双星是如何形成的。 此外，这些探测还可以帮助我们研究假设存在的原初黑洞，这是暗物质观测丰度的一个候选者。 在这项工作中，我们研究了从LVK双黑洞并合事件中获得的黑洞质量分布。 我们首先将一个偏斜正态分布与每个信噪比（SNR）$>$8的检测事件相关联，然后将所有这些分布相加，以此来得到该分布。 我们还从两个独立的并合双星群体中模拟黑洞双星。其中一个群体是恒星起源的群体，其质量分布类似于恒星的零龄质量函数。第二个黑洞群体遵循高斯质量分布。这种分布可以近似表示在密集恒星环境中由早期黑洞并合形成的黑洞双星群体，或者原初黑洞的双星群体。 对于这些群体，我们评估了可探测事件的数量，并拟合它们的组合以匹配LVK观测结果。 在我们的工作中，我们依赖于广泛的恒星起源黑洞质量分布。我们发现，通过结合这种恒星起源的质量分布和高斯分布，可以更好地拟合观察到的LVK事件，而不是单独使用恒星起源的质量分布。 显示英文摘要

摘要： The merging black hole binaries detected by the LIGO-Virgo-KAGRA (LVK) gravitational-wave observatories, may help us shed light on how such binaries form. In addition, these detections can help us probe the hypothesized primordial black holes, a candidate for the observed abundance of dark matter. In this work, we study the black-hole mass distribution obtained from the LVK binary black hole merger events. We obtain that distribution by first associating a skewed normal distribution to each event detected with a signal to noise ratio (SNR) $>$ 8 and then summing all such distributions. We also simulate black hole binaries from two separate populations of merging binaries. One of these is a stellar-origin population that follows a mass-distribution similar to the zero-age mass function of stars. The second population of black holes follows a Gaussian mass-distribution. Such a distribution could approximate a population of black hole binaries formed from earlier black hole mergers in dense stellar environments, or binaries of primordial black holes. For those populations, we evaluate the number of detectable events and fit their combination to the LVK observations. In our work, we rely on a wide range of stellar-origin black-hole mass distributions. We find that the observed LVK events can be fitted much better by the combination of such a stellar-origin mass distribution and a Gaussian distribution, than by the stellar-origin mass distribution alone.