A standard siren cosmological measurement from the potential GW190521 electromagnetic counterpart ZTF19abanrhr. Issue 2 (15th April 2022)

• Record Type: Journal Article
• Authors: Chen, Hsin-Yu; Haster, Carl-Johan; Vitale, Salvatore; Farr, Will M; Isi, Maximiliano
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 513:Issue 2(2022)
• Page Start: 2152
• Page End: 2157
• Publication Date: 2022-04-15
• Subjects: gravitational waves -- cosmological parameters; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac989
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: The identification of the electromagnetic (EM) counterpart candidate ZTF19abanrhr to the binary black hole merger GW190521 opens the possibility to infer cosmological parameters from this standard siren with a uniquely identified host galaxy. The distant merger allows for cosmological inference beyond the Hubble constant. Here, we show that the three-dimensional spatial location of ZTF19abanrhr calculated from the EM data remains consistent with the latest sky localization of GW190521 provided by the LIGO-Virgo Collaboration. If ZTF19abanrhr is associated with the GW190521 merger, and assuming a flat w CDM model, we find that $H_0=48^{+23}_{-10}\, \mathrm{km} \, \mathrm{s}^{-1}\, \mathrm{Mpc}^{-1}$, $\Omega _m=0.35^{+0.41}_{-0.26}$, and $w_0=-1.31^{+0.61}_{-0.48}$ (median and $68{{\ \rm per\ cent}}$ credible interval). If we use the Hubble constant value inferred from another gravitational-wave event, GW170817, as a prior for our analysis, together with assumption of a flat ΛCDM and the model-independent constraint on the physical matter density ωm from Planck, we find $H_0=68.9^{+8.7}_{-6.0}\, \mathrm{km} \, \mathrm{s}^{-1}\, \mathrm{Mpc}^{-1}$ .