Abstract
Gravitational waves(GWs)from compact binary coalescences encode the absolute luminosity distances of GW sources.Once the redshifts of GW sources are known,one can use the distance-redshift relation to constrain cosmological parameters.One way to obtain the redshifts is to localize GW sources by GW observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift information of the potential host galaxies,commonly referred to as the dark siren method.The third-generation(3G)GW detectors are planned to work in the 2030s and will observe numerous compact binary coalescences.Using these GW events as dark sirens requires high-quality galaxy catalogs from future sky survey projects.The China Space Station Telescope(CSST)will be launched in 2024 and will observe billions of galaxies within a 17500 deg2 survey area with redshift up to z～4,providing photometric and spectroscopic galaxy catalogs.In this work,we simulate the CSST galaxy catalogs and the 5-year GW data from the 3G GW detectors and combine them to infer the Hubble constant(H0).Our results show that the measurement precision of H0 could reach the sub-percent level,meeting the standard of precision cosmology.We conclude that the synergy between CSST and the 3G GW detectors is of great significance in measuring the Hubble constant.
基金项目
National SKA Program of China(2022SKA0110200)
National SKA Program of China(2022SKA0110203)
国家自然科学基金(11975072)
国家自然科学基金(11875102)
国家自然科学基金(11835009)
science research grants from the China Manned Space Project(CMS-CSST-2021-B01)
高等学校学科创新引智计划(111计划)(B16009)
万方数据