Can Thorne-Żytkow objects source GW190814-type events?
Can Thorne-Żytkow objects source GW190814-type events?
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DOI：
10.1103/physrevd.105.123022
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发表时间：
2021-06
影响因子：
5
通讯作者：
I. Cholis;K. Kritos;D. Garfinkle
中科院分区：
文献类型：
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作者：
I. Cholis;K. Kritos;D. Garfinkle
LIGO-Virgo合作在第三次运行中报告了合并事件GW 190814，涉及一个2.6 M的物体与一个23 M的黑洞。在这封信中，我们研究的条件下，索恩-playytkow对象（TdoOs）可以连接到该类型的事件。我们首先评估TtoOs在本地宇宙中的出现率。在TtoOs最终成为低质量隙黑洞的假设下，我们评估了这些黑洞如何与其他恒星质量黑洞形成双星，并与GW 190814类型事件（1-23 Gpc−3 yr−1）的报告速率进行了比较。我们发现，在密集的恒星集群TtoO不能解释LIGO-Virgo率没有TtoO人口在现场提供了一个主导的贡献。我们还发现，TDOO内形成的分层三重系统中的领域与第三个更遥远的星星是恒星质量的黑洞的祖先，可能能够给出一个速率相媲美的GW 190814型事件。在这种情况下，未来的观测应该会发现恒星质量和低质量隙黑洞之间的合并，其中较低的质量跨越整个低质量隙范围。
The LIGO-Virgo collaboration reported in their third run the coalescence event GW190814 involving a 2.6 M object with a 23 M black hole. In this letter we study the conditions under which Thorne-Żytkow objects (TŻOs) can be connected to that type of events. We evaluate first the rate of appearance of TŻOs in the local Universe. Under the assumption that TŻOs eventually become low mass gap black holes we evaluate how those black holes end up in binaries with other stellar mass black holes and compare to the reported rate for GW190814-type of events (1-23 Gpc−3 yr−1). We find that TŻOs in dense stellar clusters can not explain the LIGO-Virgo rate without a TŻO population in the field providing a dominant contribution. We also find that TŻOs formed within hierarchical triple systems in the field with the third more distant star being the progenitor of a stellar mass black hole, may be able to give a rate comparable to that of GW190814-type events. In that case, future observations should discover mergers between stellar mass and low mass gap black holes, with the lower mass spanning the entire low mass gap range.