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The Hitchhiker’s Guide to the Galaxy Catalog Approach for Dark Siren Gravitational-wave Cosmology

Published version
Peer-reviewed

Repository DOI


Change log

Abstract

jats:titleAbstract</jats:title> jats:pWe outline the “dark siren” galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in the implementation of this method. When a confident transient electromagnetic counterpart to a GW event is unavailable, the identification of a unique host galaxy is in general challenging. Instead, as originally proposed by Schutz, one can consult a galaxy catalog and implement a dark siren statistical approach incorporating all potential host galaxies within the localization volume. Trott & Huterer recently claimed that this approach results in a biased estimate of the Hubble constant, jats:italicH</jats:italic> jats:sub0</jats:sub>, when implemented on mock data, even if optimistic assumptions are made. We demonstrate explicitly that, as previously shown by multiple independent groups, the dark siren statistical method leads to an unbiased posterior when the method is applied to the data correctly. We highlight common sources of error possible to make in the generation of mock data and implementation of the statistical framework, including the mismodeling of selection effects and inconsistent implementations of the Bayesian framework, which can lead to a spurious bias.</jats:p>

Description

Keywords

5101 Astronomical Sciences, 51 Physical Sciences

Journal Title

Astronomical Journal

Conference Name

Journal ISSN

0004-6256
1538-3881

Volume Title

Publisher

American Astronomical Society
Sponsorship
Ghent University BOF project (BOF/STA/202009/040)
Fonds Wetenschappelijk Onderzoek (FWO) (BOF20/IBF/124)
National Aeronautics and Space Administration (NASA) (HST-HF2-51488.001-A)
Tata Institute of Fundamental Research (TIFR) (Universe Lab)
EC ∣ European Research Council (ERC) (SHADE 949572)
Centre National d’Etudes Spatiales (CNES) (LISA)