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arXiv 1909.01356astro-ph.HEastro-ph.GAgr-qc
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宇宙金属丰度演化对LIGO双黑洞最大质量的影响

The Impact of metallicity evolution of the universe on the maximum mass of LIGO binary black holes

Mohammadtaher Safarzadeh, Will M. Farr

摘要:

我们可能会对观测到大质量黑洞在局部宇宙中的合并产生偏见,因为最大黑洞质量($M_{BH}^{\rm max}$)的界限取决于关于恒星形成气体在宇宙时间内金属丰度演化的假设。根据LIGO观测到的10个双黑洞源的金属丰度演化、质量分布和延迟时间的边界。我们将$M_{BH}^{\rm max}$参数化为金属丰度的函数,金属丰度本身被建模为以适度或快速的方式随红移而演变。快速金属丰度演化模型预测的$M_{BH}^{\rm max}=44^{+9}_{-5}M_{\odot}$有一个严格的边界,而中等金属丰度演化模型预测的$M_{BH}^{\rm max}$的边界是$M_{BH}^{\rm max}=52^{+16}_{-9} M_{\odot}$。因此,从GW数据推断$M_{BH}^{\rm max}$取决于假设的宇宙金属富集历史,目前没有严格的限制。

英文摘要:

We can be biased against observing massive black holes to merge in the local universe as the bounds on the maximum black hole mass ($M_{BH}^{\rm max}$) depends on the assumptions regarding the metallicity evolution of the star forming gas across the cosmic time. We investigate the bounds on the metallicity evolution, mass distribution and delay times of the binary black hole sources based on the ten observed events by LIGO. We parametrize $M_{BH}^{\rm max}$ to be a function of metallicity which itself is modeled to evolve with redshift in either a modest or rapid fashion. Rapid metallicity evolution models predict a stringent bound of $M_{BH}^{\rm max}=44^{+9}_{-5}M_{\odot}$, while the bound on $M_{BH}^{\rm max}$ in the models with modest metallicity evolution is $M_{BH}^{\rm max}=52^{+16}_{-9} M_{\odot}$. Therefore, inferring $M_{BH}^{\rm max}$ from GW data depends on the assumed metal enrichment history of the universe that is not severely constrained at the moment.

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