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arXiv 1904.04835astro-ph.HE
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新形成黑洞的吸积反馈及其对LIGO源的意义

Accretion Feedback from newly-formed black holes and its implications for LIGO Sources

Aldo Batta, Enrico Ramirez-Ruiz

摘要:

最常见的恒星质量黑洞(BH)双星的形成通道,如LIGO观测到的,通常假设它们是由大质量前超新星恒星的直接坍缩组装而成的。然而,目前还不清楚新形成的黑洞的最终质量和自旋是否来自整个恒星祖先的坍缩,或者只是其中的一小部分,因为黑洞形成过程中释放的吸积反馈与周围的恒星的耦合将不可避免地导致它的喷射。如果黑洞是通过吸积盘形成的,从中心流出的气体将导致残余气体喷出,从而阻止恒星坍缩,减少新形成的黑洞可以吸积的质量和自旋。在这里,我们讨论的一般性质的黑洞(质量和自旋)与崩溃的旋转,氦星前超新星的祖先。当包括吸积反馈时,BH驱动强大的外流,加热周围的包层,有效地关闭坍缩。这就产生了各种结果,从非常大的低自旋黑洞(如GW150914所推断的)到更轻和更快旋转的黑洞(如GW151226所推断的)。

英文摘要:

Most common formation channels of stellar mass black hole (BH) binaries like the ones observed by LIGO, often assume they are assembled from the direct collapse of massive pre-supernova stars. However, it is still unclear whether the final mass and spin of the newly formed BH arises from the collapse of the entire stellar progenitor or just a fraction of it, given that coupling of accretion feedback released during BH formation to the surrounding infalling star will inevitably lead to its ejection. If the BH is built up via disk accretion, outflows from the center will result in residual gas ejection, thus halting the stellar collapse and reducing the amount of mass and spin that can be accreted by the newly formed BH. Here we discuss the general properties of BHs (mass and spin) associated with the collapse of rotating, helium star pre-supernova progenitors. When accretion feedback is included, the BH drives powerful outflows that heat the surrounding envelope, effectively shutting down the collapse. This gives rise to various outcomes ranging from very massive BHs with low spins, as inferred for GW150914, to lighter and faster-spinning BHs, as deduced for GW151226.

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