Dark standard siren cosmology with bright galaxy subsets

2025/05/16 by Naveed, Khuzaifa, Turski, Cezary, Ghosh, Archisman · 4 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.2505.11268

Abstract

In this short paper, we investigate the impact of selecting only a subset of bright galaxies to provide redshift information for a dark standard siren measurement of the Hubble constant H₀. Employing gravitational-wave observations from the Third Gravitational-Wave Transient Catalogue (GWTC-3) in conjunction with the GLADE+ galaxy catalogue, we show that restricting to bright galaxy subsets can enhance the precision of the H₀ estimate by up to 80% in the most favorable scenario. A comprehensive assessment of systematic uncertainties is still required. This work lays the foundation for employing alternative tracers -- such as brightest cluster galaxies (BCGs) and luminous red galaxies (LRGs) -- in gravitational-wave cosmology, particularly at redshifts where conventional galaxy catalogues offer limited coverage.

Cited by

• The impact of precession and higher-order multipoles on cosmological inference
• Identifying the host of compact binary mergers
• Using gravitational wave dark sirens to choose between host galaxy weighting models
• Cosmic Cartography II: completing galaxy catalogs for gravitational-wave cosmology

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