Enhancing the localization of gravitational-wave hosts with SKYFAST: Rapid volume and inclination angle reconstruction

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Volume 694 (February 2025)

A&A, 694 (2025) A245

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Table 1.

Five most probable host galaxies for GW170817 from the GLADE+ catalog.

Galaxy	α [rad]	δ [rad]	d_L [Mpc]	log P	θ_jn [rad]
ESO 575−055	3.43	−0.39	45.3	−4.1	$2 . 82_{- 0.18}^{+ 0.21}$ $2.82^{+0.21}_{-0.18}$
ESO 508−014	3.44	−0.40	44.5	−4.5	$2 . 78_{- 0.18}^{+ 0.18}$ $2.78^{+0.18}_{-0.18}$
NGC 4993	3.44	−0.40	41.1	−4.7	$2 . 63_{- 0.15}^{+ 0.20}$ $2.63^{+0.20}_{-0.15}$
J131045.95−235156.6	3.45	−0.41	40.3	−5.2	$2 . 59_{- 0.13}^{+ 0.19}$ $2.59^{+0.19}_{-0.13}$
PGC 803966	3.43	−0.40	39.4	−5.3	$2 . 56_{- 0.13}^{+ 0.16}$ $2.56^{+0.16}_{-0.13}$

Notes. The probability of each galaxy being the host was computed according to the intermediate posterior reconstructed with SKYFAST. The last column shows the median value of the inclination angle posterior distribution conditioned on the position of each galaxy. The 90% credible intervals include the uncertainty on d_L, propagated from the photometric estimate of the redshift. The true host NGC 4993 is ranked third.

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