Stellar Evolution in the Disks of Active Galactic Nuclei Produces Rapidly Rotating Massive Stars
Stellar Evolution in the Disks of Active Galactic Nuclei Produces Rapidly Rotating Massive Stars
复制标题
DOI：
10.3847/1538-4357/abfb67
复制
发表时间：
2021-02
期刊：
影响因子：
--
通讯作者：
A. Jermyn;A. Dittmann;M. Cantiello;R. Perna
中科院分区：
文献类型：
--
作者：
A. Jermyn;A. Dittmann;M. Cantiello;R. Perna
恒星既可以在活动星系核的吸积盘中形成，也可以被活动星系核(AGN)中的吸积盘捕获。这些活动星系核恒星受到辐射，并受到极端水平的吸积，这可以将即使是低质量的恒星变成非常大质量的恒星(M>；100m⊙)，其演化可能导致形成大质量致密天体(M>；10m⊙)。在这里，我们探索这些活动星系核恒星的自转和它们留下的残留物。我们发现，活动星系核恒星通过吸积迅速自转，最终达到接近临界的自转速度。它们进一步保持接近临界的旋转，即使它们脱下信封，变得紧凑，并经历燃烧的后期阶段。这使它们成为产生高自旋大质量黑洞的理想候选者，比如LIGO-Virgo在GW 190521g上看到的黑洞，以及长长的伽马射线爆发和与活动星系核圆盘相关的化学污染。
Stars can either be formed in or captured by the accretion disks in active galactic nuclei (AGNs). These AGN stars are irradiated and subject to extreme levels of accretion, which can turn even low-mass stars into very massive ones (M > 100M ⊙) whose evolution may result in the formation of massive compact objects (M > 10M ⊙). Here we explore the spins of these AGN stars and the remnants they leave behind. We find that AGN stars rapidly spin up via accretion, eventually reaching near-critical rotation rates. They further maintain near-critical rotation even as they shed their envelopes, become compact, and undergo late stages of burning. This makes them good candidates to produce high-spin massive black holes, such as the ones seen by LIGO-Virgo in GW 190521g, as well as long gamma-ray bursts and the associated chemical pollution of the AGN disk.