arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.03603astro-ph.GAastro-ph.COgr-qc
收藏

大质量恒星黑洞双星的宇宙考古学

Cosmic archaeology with massive stellar black hole binaries

L. Graziani, R. Schneider, S. Marassi, W. Del Pozzo, M. Mapelli, N. Giacobbo

摘要:

大质量恒星黑洞双星(MBHB)的存在,与初级黑洞(BH)的质量$\ge 31 \, M_\odot$,被证明的探测引力波(GW)事件GW 150914在第一次LIGO/Virgo观测运行(O 1),并连续证实了7个额外的GW信号中发现的O 1和O2的数据。采用星系形成模型\texttt{GAMESH}结合双星布居合成(BPS)计算,通过选择质量和合并红移一致的模拟双星,研究了这些MBHB的起源。我们发现,它们的宇宙出生率峰值在红移范围$6.5 \leq z \leq 10$,无论采用的BPS。这些MBHB是在宇宙再电离结束之前,即大大超过宇宙恒星形成的峰值之前,在低金属量($Z \sim [0.01-0.1] \, Z_{\odot}$)、低恒星质量星系中形成的旧系统。由合并MBHB产生的GW信号为探测遥远星系中恒星星族的性质开辟了新的可能性,目前这些星系太微弱,无法用现有的电磁设施探测到。

英文摘要:

The existence of massive stellar black hole binaries (MBHBs), with primary black hole (BH) masses $\ge 31 \, M_\odot$, was proven by the detection of the gravitational wave (GW) event GW150914 during the first LIGO/Virgo observing run (O1), and successively confirmed by seven additional GW signals discovered in the O1 and O2 data. By adopting the galaxy formation model \texttt{GAMESH} coupled with binary population synthesis (BPS) calculations, here we investigate the origin of these MBHBs by selecting simulated binaries compatible in mass and coalescence redshifts. We find that their cosmic birth rates peak in the redshift range $6.5 \leq z \leq 10$, regardless of the adopted BPS. These MBHBs are then old systems forming in low-metallicity ($Z \sim [0.01-0.1] \, Z_{\odot}$), low-stellar-mass galaxies, before the end of cosmic reionization, i.e. significantly beyond the peak of cosmic star formation. GW signals generated by coalescing MBHBs open up new possibilities to probe the nature of stellar populations in remote galaxies, at present too faint to be detected by available electromagnetic facilities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑