First Measurement of the Hubble Constant from Gravitational Wave–Galaxy Cross Correlations
8 affiliations
- 1University of Portsmouth
- 2ICTP South American Institute for Fundamental Research
- 3Université PSL
- 4Queen Mary University of London
- 5Universidade de São Paulo
- 6Centro Brasileiro de Pesquisas Físicas
- 7Universidade Federal do Rio de Janeiro
- 8Universidade Federal do Espírito Santo
Abstract
We measure for the first time the Hubble constant ( H ₀ ) from the cross correlation of galaxies and gravitational waves (GWs), by applying the Peak Sirens method. This method consists of finding the peak of the 3D angular cross-spectrum C ℓ ( z , D L ) between the galaxy redshifts ( z ) and the GW luminosity distances ( D L ). Using two GW events from the GWTC-3.0 catalog and the GLADE + galaxy catalog, we make the first detection of the cross-correlation peak at 5.9 σ confidence. This signal comes mostly from the best localized event in the catalog, GW190814, which alone provides a 3.4 σ significance. Adding the multimessenger event GW170817, but without using its known redshift, we find H 0 = 6 7 − 15 + 18 km s ⁻¹ Mpc ⁻¹ and the first observational constraint on the GW bias, b gw < 4.3 at 95% confidence interval. These measurements set the stage for future novel cosmological constraints with this technique.
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BibTeX
@article{matos2026first,
title = {{First Measurement of the Hubble Constant from Gravitational Wave–Galaxy Cross Correlations}},
author = {Isabela Santiago de Matos and Charles Dalang and Tessa Baker and Raul Abramo and João Ferri and Miguel Quartin},
journal = {The Astrophysical Journal},
year = {2026},
month = nov,
doi = {10.3847/1538-4357/ae9a7a},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/ae9a7a},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - First Measurement of the Hubble Constant from Gravitational Wave–Galaxy Cross Correlations
AU - Isabela Santiago de Matos
AU - Charles Dalang
AU - Tessa Baker
AU - Raul Abramo
AU - João Ferri
AU - Miguel Quartin
PY - 2026
DA - 2026/11/02
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/ae9a7a
UR - https://iopscience.iop.org/article/10.3847/1538-4357/ae9a7a
AB - We measure for the first time the Hubble constant ( H ₀ ) from the cross correlation of galaxies and gravitational waves (GWs), by applying the Peak Sirens method. This method consists of finding the peak of the 3D angular cross-spectrum C ℓ ( z , D L ) between the galaxy redshifts ( z ) and the GW luminosity distances ( D L ). Using two GW events from the GWTC-3.0 catalog and the GLADE + galaxy catalog, we make the first detection of the cross-correlation peak at 5.9 σ confidence. This signal comes mostly from the best localized event in the catalog, GW190814, which alone provides a 3.4 σ significance. Adding the multimessenger event GW170817, but without using its known redshift, we find H 0 = 6 7 − 15 + 18 km s ⁻¹ Mpc ⁻¹ and the first observational constraint on the GW bias, b gw < 4.3 at 95% confidence interval. These measurements set the stage for future novel cosmological constraints with this technique.
SN - 1538-4357
SN - 0004-637X
ER -