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arXiv 2312.03316astro-ph.HEastro-ph.GAgr-qc
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推断 LIGO-Virgo-KAGRA 黑洞的宿主星系性质

Inferring host-galaxy properties of LIGO-Virgo-KAGRA's black holes

Aditya Vijaykumar, Maya Fishbach, Susmita Adhikari, Daniel E. Holz

AI总结:

本研究利用GWTC-3数据约束双黑洞并合的延迟时间分布,结合UniverseMachine模拟推断其宿主星系性质,发现宿主星系的中位恒星形成率与质量等特征,为电磁后续观测与宇宙学参数测量提供支持。

摘要:

对双黑洞(BBH)并合产生的引力波观测已经测量了BBH并合率的红移演化。宇宙中星系的数密度根据其物理性质(如恒星质量和恒星形成率)随红移呈现不同的演化。在本研究中,我们表明测量到的BBH种群级别的红移分布能够揭示其可能宿主星系的性质。我们首先假设BBH的宿主可以通过按恒星质量或恒星形成率加权的星系混合模型来描述,并发现我们可以对来自恒星质量加权星系样本的并合比例设定上限。随后,我们利用GWTC-3数据约束了具有物理动机的幂律延迟时间分布参数,并利用该延迟时间模型在UniverseMachine模拟中自洽地追踪星系,以推断不同红移下BBH的可能宿主星系。我们发现,在红移 $z=0.21$ 处推断出的宿主星系分布具有约 $0.9\\,M_\odot\mathrm{yr}^{-1}$ 的中位恒星形成率和约 $1.9 \times 10^{10}\\,M_\odot$ 的中位恒星质量。我们还提供了宿主星系的平均恒星年龄、晕质量、晕半径、本动速度和大尺度偏差的分布,以及它们在B波段和 $\rm K_s$ 波段的绝对星等。我们的结果可用于设计BBH的最佳电磁后续观测策略,并有助于利用统计暗警笛方法测量宇宙学参数。

英文摘要:

Observations of gravitational waves from binary black hole (BBH) mergers have measured the redshift evolution of the BBH merger rate. The number density of galaxies in the Universe evolves differently with redshift based on their physical properties, such as their stellar masses and star formation rates. In this work we show that the measured population-level redshift distribution of BBHs sheds light on the properties of their probable host-galaxies. We first assume that the hosts of BBHs can be described by a mixture model of galaxies weighted by stellar mass or star formation rate, and find that we can place upper limits on the fraction of mergers coming from a stellar mass weighted sample of galaxies. We then constrain parameters of a physically motivated power-law delay-time distribution using GWTC-3 data, and self-consistently track galaxies in the \textsc{UniverseMachine} simulations with this delay-time model to infer the probable host-galaxies of BBHs over a range of redshifts. We find that the inferred host-galaxy distribution at redshift $z=0.21$ has a median star formation rate $\sim 0.9\,M_\odot\mathrm{yr}^{-1}$ and a median stellar mass of $\sim 1.9 \times 10^{10}\,M_\odot$. We also provide distributions for the mean stellar age, halo mass, halo radius, peculiar velocity, and large scale bias associated with the host-galaxies, as well as their absolute magnitudes in the B- and ${ \rm K_s}$-bands. Our results can be used to design optimal electromagnetic follow-up strategies for BBHs, and also to aid the measurement of cosmological parameters using the statistical dark siren method.

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