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arXiv 2603.20195astro-ph.COastro-ph.HE
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利用LIGO/Virgo/KAGRA O4a暗哨的Hubble常数改进约束

Improved constraint on the Hubble constant from dark sirens with LIGO/Virgo/KAGRA O4a

Centro Brasileiro de Pesquisas Físicas(巴西物理研究中心)

V. Alfradique, C. R. Bom, G. Teixeira, A. Santos

AI总结:

本文通过暗哨方法结合DESI数据和深度学习模型,利用17个暗哨事件改进Hubble常数测量,最终约束Hubble常数为69.9±4.1 km/s/Mpc,比仅GW170817的结果提升了约11%的不确定性。

摘要:

本文通过统计暗哨方法,利用LIGO/Virgo/KAGRA第四观测运行中的七个良好定位的引力波事件以及前三次运行中的十个额外事件,结合DESI Legacy Imaging Survey的星系目录和深度学习模型,计算光度红移概率密度函数。我们扩展了之前的分析,包括事件GW230731_215307和GW230927_153832,使用第四次引力波瞬变目录的天空图,并引入关键方法改进:r波段亮度加权的宿主星系;扩展的引力波似然函数,纳入双黑洞组件质量信息;以及一致处理选择效应,考虑LS星系目录的不完整性。使用总共17个良好定位的暗哨(七个来自第四次观测运行的第一部分,O4a),我们得到H0=78.8±14.6 km/s/Mpc(无亮度加权)和H0=78.2±12.0 km/s/Mpc(应用r波段亮度加权)。最后,我们将亮度加权的暗哨样本与明亮哨GW170817结合,包括喷流视角约束和宿主星系异常速度修正,得到最终约束H0=69.9±4.1 km/s/Mpc,比仅GW170817的结果提升了约11%的不确定性。

英文摘要:

A new measurement of the Hubble constant $H_0$ is presented using the statistical dark siren method applied to a sample of seven well-localized gravitational-wave (GW) events from the fourth LIGO-Virgo-KAGRA (LVK) observing run and ten additional events from the first three runs. Galaxy catalogs from the DESI Legacy Imaging Survey (LS) are combined with a deep learning model to compute photometric redshift probability density functions. We extend our previous analysis by including the events GW230731_215307 and GW230927_153832, using sky maps from the fourth Gravitational-Wave Transient Catalog (GWTC-4), and introducing key methodological improvements: $r$-band luminosity weighting of host galaxies; an extended GW likelihood that incorporates information from the binary black hole component masses; and a consistent treatment of selection effects that accounts for the incompleteness of the magnitude-limited LS galaxy catalog. Using a total of 17 well-localized dark sirens (seven from the first part of the fourth observing run, O4a), we obtain $H_0 = 78.8^{+14.6}_{-12.2}$ km/s/Mpc without luminosity weighting and $H_0 = 78.2^{+12.0}_{-11.0}$ km/s/Mpc when applying $r$-band luminosity weighting. Finally, we combine the luminosity-weighted dark siren sample with the bright siren GW170817, including constraints on the jet viewing angle and corrections for the host galaxy peculiar velocity, to obtain a final constraint of $H_0 = 69.9^{+4.1}_{-4.0}$ km/s/Mpc, representing an improvement of approximately 11% in the uncertainty relative to the GW170817-only result.

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。

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