论文标题
宇宙时间的最大黑洞质量
Maximum Black Hole mass across Cosmic Time
论文作者
论文摘要
在生命的尽头，有望将非常庞大的恒星倒入黑洞。最近发现了重力波事件的85 MSUN黑洞GW 190521似乎提出了一个基本问题，即如何在大约50 msun配对限制的大约50 msun配对限制之上存在，其中预计不会将恒星吹成不剩余的零件。使用MESA，我们表明，对于具有非极端假设的恒星模型，在降低金属性（z/zsun <0.1）时，有90..100 MSUN恒星可以产生蓝色的超级祖先，核心质量足够小，以保持低于基本的配对限制，但通过稳定的质量损失了巨大的巨大量，该量不足以造成较小的速度，而smill smill a ins smill a and and smill on and smill a and and smill on and and smill on and and smill a n''''''''''''''''''''这两个关键点是正确考虑核心过冲和出色的风理物理学，并改善了宿主星系金属性特征的铁（Fe）含量的质量损失缩放。我们的建模提供了一个强大的场景，不仅可以通过对不稳定性设置的最大黑洞质量加倍，而且还使我们能够在物理声音框架中探测最大恒星黑洞质量，这是金属性和宇宙时间的函数。
At the end of its life, a very massive star is expected to collapse into a black hole. The recent detection of an 85 Msun black hole from the gravitational wave event GW 190521 appears to present a fundamental problem as to how such heavy black holes exist above the approximately 50 Msun pair-instability limit where stars are expected to be blown to pieces with no remnant left. Using MESA, we show that for stellar models with non-extreme assumptions, 90..100 Msun stars at reduced metallicity (Z/Zsun < 0.1) can produce blue supergiant progenitors with core masses sufficiently small to remain below the fundamental pair-instability limit, yet at the same time lose an amount of mass via stellar winds that is small enough to end up in the range of an "impossible" 85 Msun black hole. The two key points are the proper consideration of core overshooting and stellar wind physics with an improved scaling of mass loss with iron (Fe) contents characteristic for the host galaxy metallicity. Our modelling provides a robust scenario that not only doubles the maximum black hole mass set by pair instability, but also allows us to probe the maximum stellar black hole mass as a function of metallicity and Cosmic time in a physically sound framework.
