Velocity debiasing for Hubble constant measurements from standard sirens. (arXiv:1909.08627v1 [astro-ph.CO])

Velocity debiasing for Hubble constant measurements from standard sirens. (arXiv:1909.08627v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Mukherjee_S/0/1/0/all/0/1">Suvodip Mukherjee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lavaux_G/0/1/0/all/0/1">Guilhem Lavaux</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouchet_F/0/1/0/all/0/1">Fran&#xe7;ois R. Bouchet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jasche_J/0/1/0/all/0/1">Jens Jasche</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wandelt_B/0/1/0/all/0/1">Benjamin D. Wandelt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nissanke_S/0/1/0/all/0/1">Samaya M. Nissanke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Leclercq_F/0/1/0/all/0/1">Florent Leclercq</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hotokezaka_K/0/1/0/all/0/1">Kenta Hotokezaka</a>

Gravitational wave (GW) sources are an excellent probe of the luminosity
distance and offer a novel measure of the Hubble constant, $H_0$. This
estimation of $H_0$ from standard sirens requires an accurate estimation of the
cosmological redshift of the host galaxy of the GW source, after correcting for
its peculiar velocity. Absence of an accurate peculiar velocity correction
affects both the precision and accuracy of the measurement of $H_0$,
particularly for nearby sources. We propose a framework to incorporate such a
peculiar velocity correction for GW sources. The implementation of our method
to the event GW170817 combined with the Very Large Baseline Interferometry
(VLBI) observation leads to a revised value of $H_0= 69.3^{+ 4.5}_{-4.0}$ km
s$^{-1}$Mpc$^{-1}$; more importantly, it demonstrates that our method will
allow to achieve in practice unbiased, accurate measurements of $H_0$ at the
precision promised by standard siren forecasts.

Gravitational wave (GW) sources are an excellent probe of the luminosity
distance and offer a novel measure of the Hubble constant, $H_0$. This
estimation of $H_0$ from standard sirens requires an accurate estimation of the
cosmological redshift of the host galaxy of the GW source, after correcting for
its peculiar velocity. Absence of an accurate peculiar velocity correction
affects both the precision and accuracy of the measurement of $H_0$,
particularly for nearby sources. We propose a framework to incorporate such a
peculiar velocity correction for GW sources. The implementation of our method
to the event GW170817 combined with the Very Large Baseline Interferometry
(VLBI) observation leads to a revised value of $H_0= 69.3^{+ 4.5}_{-4.0}$ km
s$^{-1}$Mpc$^{-1}$; more importantly, it demonstrates that our method will
allow to achieve in practice unbiased, accurate measurements of $H_0$ at the
precision promised by standard siren forecasts.

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