arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.11630astro-ph.HEastro-ph.GAastro-ph.SR
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黑洞合并的宇宙速率和化学均匀双星演化的对不稳定超新星

Cosmic Rates of Black Hole Mergers and Pair-Instability Supernovae from Chemically Homogeneous Binary Evolution

Lise du Buisson, Pablo Marchant, Philipp Podsiadlowski, Chiaki Kobayashi, Filipe B. Abdalla, Philip Taylor, Ilya Mandel, Selma E. de Mink, Takashi J. Moriya, Norbert Langer

摘要:

在高级引力波探测器网络的前三次观测中,LIGO/Virgo合作探测到了几个黑洞双星(BHBH)合并。随着检测到的BHBH合并数量的增加,将有可能限制其形成的不同渠道。在这里,我们认为化学均匀演化(CHE)通道在紧密的二进制文件,通过执行人口合成模拟,结合现实的二进制模型与详细的宇宙学计算的化学和恒星形成历史的宇宙。这使我们能够限制人口属性,以及宇宙学和aLIGO/aVirgo通过这一途径形成的BHBH合并的检测率。我们通过CHE通道预测了$5.8 \, \textrm{Gpc}^{-3} \textrm{yr}^{-1}$红移为零时的BHBH合并率,并与aLIGO/aVirgo测量的${53.2}_{-28.2}^{+55.8} \, \text{Gpc}^{-3} \text{yr}^{-1}$合并率进行比较,发现最终合并系统的BH质量在PISN间隙以下的$17 - 43 \, \textrm{M}_{\odot}$范围内,而在PISN间隙以上的$>124 \, \textrm{M}_{\odot}$范围内。我们研究了黑洞形成过程中动量反冲的影响,并计算了宇宙学和星等限制的PISN率。我们还研究了高红移偏差对恒星形成率的影响。我们发现,动量踢往往会增加延迟时间的BHBH系统,我们的幅度有限的PISN率估计表明,目前的深调查应该能够检测到这样的事件。最后,我们发现,我们的宇宙学合并率估计的变化最多$\sim 8\%$在早期宇宙的恒星形成率的轻微偏差,并通过高达$\sim 40\%$的极端偏差。

英文摘要:

During the first three observing runs of the Advanced gravitational-wave detector network, the LIGO/Virgo collaboration detected several black hole binary (BHBH) mergers. As the population of detected BHBH mergers grows, it will become possible to constrain different channels for their formation. Here we consider the chemically homogeneous evolution (CHE) channel in close binaries, by performing population synthesis simulations that combine realistic binary models with detailed cosmological calculations of the chemical and star-formation history of the Universe. This allows us to constrain population properties, as well as cosmological and aLIGO/aVirgo detection rates of BHBH mergers formed through this pathway. We predict a BHBH merger rate at redshift zero of $5.8 \, \textrm{Gpc}^{-3} \textrm{yr}^{-1}$ through the CHE channel, to be compared with aLIGO/aVirgo's measured rate of ${53.2}_{-28.2}^{+55.8} \, \text{Gpc}^{-3} \text{yr}^{-1}$, and find that eventual merger systems have BH masses in the range $17 - 43 \, \textrm{M}_{\odot}$ below the pair-instability supernova (PISN) gap, and $>124 \, \textrm{M}_{\odot}$ above the PISN gap. We investigate effects of momentum kicks during black hole formation, and calculate cosmological and magnitude limited PISN rates. We also study the effects of high-redshift deviations in the star formation rate. We find that momentum kicks tend to increase delay times of BHBH systems, and our magnitude limited PISN rate estimates indicate that current deep surveys should be able to detect such events. Lastly, we find that our cosmological merger rate estimates change by at most $\sim 8\%$ for mild deviations of the star formation rate in the early Universe, and by up to $\sim 40\%$ for extreme deviations.

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