A gravitational-wave measurement of the Hubble constant following the second observing run of Advanced LIGO and Virgo

Isa, Hafizah Noor (2021) A gravitational-wave measurement of the Hubble constant following the second observing run of Advanced LIGO and Virgo. The Astrophysical Journal, 909 (2). pp. 1-18. ISSN 0004-637X E-ISSN 1538-4357

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Abstract

This paper presents the gravitational-wave measurement of the Hubble constant (H 0) using the detections from the first and second observing runs of the Advanced LIGO and Virgo detector network. The presence of the transient electromagnetic counterpart of the binary neutron star GW170817 led to the first standard-siren measurement of H 0. Here we additionally use binary black hole detections in conjunction with galaxy catalogs and report a joint measurement. Our updated measurement is H 0 = km s-1 Mpc-1 (68.3% of the highest density posterior interval with a flat-in-log prior) which is an improvement by a factor of 1.04 (about 4%) over the GW170817-only value of km s-1 Mpc-1. A significant additional contribution currently comes from GW170814, a loud and well-localized detection from a part of the sky thoroughly covered by the Dark Energy Survey. With numerous detections anticipated over the upcoming years, an exhaustive understanding of other systematic effects are also going to become increasingly important. These results establish the path to cosmology using gravitational-wave observations with and without transient electromagnetic counterparts.

Item Type:	Article (Journal)
Additional Information:	91562/9325
Uncontrolled Keywords:	Gravitational wave astronomy – Hubble constant
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	DR Hafizah Noor Isa
Date Deposited:	18 Aug 2021 16:59
Last Modified:	20 Aug 2021 10:37
URI:	http://irep.iium.edu.my/id/eprint/91562

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