Localizing merging black holes with sub-arcsecond precision using gravitational-wave lensing
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AbstractThe current gravitational-wave (GW) localization methods rely mainly on sources with electromagnetic counterparts. Unfortunately, a binary black hole does not emit light. Due to this, it is generally not possible to localize these objects precisely. However, strongly lensed gravitational waves, which are forecasted in this decade, could allow us to localize the binary by locating its lensed host galaxy. Identifying the correct host galaxy is challenging because there are hundreds to thousands of other lensed galaxies within the sky area spanned by the GW observation. However, we can constrain the lensing galaxy's physical properties through both GW and electromagnetic observations. We show that these simultaneous constraints allow one to localize quadruply lensed waves to one or at most a few galaxies with the LIGO/Virgo/Kagra network in typical scenarios. Once we identify the host, we can localize the binary to two sub-arcsec regions within the host galaxy. Moreover, we demonstrate how to use the system to measure the Hubble constant as a proof-of-principle application.
All Author(s) ListHannuksela OA, Collett TE, Caliskan M, Li TGF
Journal nameMonthly Notices of the Royal Astronomical Society
Year2020
Month11
Volume Number498
Issue Number3
PublisherOXFORD UNIV PRESS
Pages3395 - 3402
ISSN0035-8711
LanguagesEnglish-United Kingdom
Keywordsgravitational lensing: strong, gravitational waves
Web of Science Subject CategoriesAstronomy & Astrophysics;Astronomy & Astrophysics

Last updated on 2021-14-10 at 23:51