A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart
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A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart

 dc.contributor.author Virgo Collaboration dc.contributor.author Fishbach, M. dc.contributor.author Aloy Toras, Miguel Angel dc.contributor.author Cerdá Durán, Pablo dc.contributor.author Cordero Carrión, Isabel dc.contributor.author Font Roda, José Antonio dc.contributor.author Marquina Vila, Antonio dc.contributor.author Obergaulinger, M. dc.contributor.author Sanchis Gual, Nicolas dc.contributor.author Torres Forné, Alejandro dc.date.accessioned 2020-01-09T15:16:38Z dc.date.available 2020-01-09T15:16:38Z dc.date.issued 2019 dc.identifier.uri https://hdl.handle.net/10550/72539 dc.description.abstract We perform a statistical standard siren analysis of GW170817. Our analysis does not utilize knowledge of NGC 4993 as the unique host galaxy of the optical counterpart to GW170817. Instead, we consider each galaxy within the GW170817 localization region as a potential host; combining the redshifts from all of the galaxies with the distance estimate from GW170817 provides an estimate of the Hubble constant, H 0. Considering all galaxies brighter than $0.626{L}_{B}^{\star }$ as equally likely to host a binary neutron star merger, we find ${H}_{0}={77}_{-18}^{+37}$ km s−1 Mpc−1 (maximum a posteriori and 68.3% highest density posterior interval; assuming a flat H 0 prior in the range $\left[10,220\right]$ km s−1 Mpc−1). We explore the dependence of our results on the thresholds by which galaxies are included in our sample, and we show that weighting the host galaxies by stellar mass or star formation rate provides entirely consistent results with potentially tighter constraints. By applying the method to simulated gravitational-wave events and a realistic galaxy catalog we show that, because of the small localization volume, this statistical standard siren analysis of GW170817 provides an unusually informative (top 10%) constraint. Under optimistic assumptions for galaxy completeness and redshift uncertainty, we find that dark binary neutron star measurements of H 0 will converge as $40 \% /\sqrt{(N)}$, where N is the number of sources. While these statistical estimates are inferior to the value from the counterpart standard siren measurement utilizing NGC 4993 as the unique host, ${H}_{0}={76}_{-13}^{+19}$ km s−1 Mpc−1 (determined from the same publicly available data), our analysis is a proof-of-principle demonstration of the statistical approach first proposed by Bernard Schutz over 30 yr ago. dc.language.iso eng dc.relation.ispartof Astrophysical Journal Letters, 2019, vol. 871, num. 1, p. L13-1-L13-10 dc.rights.uri info:eu-repo/semantics/openAccess dc.source Virgo Collaboration Fishbach, M. Aloy Toras, Miguel Angel Cerdá Durán, Pablo Cordero Carrión, Isabel Font Roda, José Antonio Marquina Vila, Antonio Obergaulinger, M. Sanchis Gual, Nicolas Torres Forné, Alejandro 2019 A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart Astrophysical Journal Letters 871 1 L13-1 L13-10 dc.subject Astrofísica dc.subject Gravitació dc.title A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart dc.type info:eu-repo/semantics/article dc.date.updated 2020-01-09T15:16:39Z dc.identifier.doi https://doi.org/10.3847/2041-8213/aaf96e dc.identifier.idgrec 135592

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