Dissecting the progenitors of fast radio bursts through host galaxy observations

Abstract

We identify and analyze the host galaxy of the fast radio burst FRB191001, inorder to constrain possible progenitors for this burst. We identify the host withP=0.0034 that the galaxy is unrelated to the burst and then find that FRB191001has an offset of roughly ∼12kpc from the center of the galaxy. We measure the linefluxes of Hα, Hβ, OII and NII in order to obtain key pieces of information aboutthe galaxy. The host galaxy has a redshift of z=0.235, stellar mass of 4:6±1:910M ,a star formation-rate of 3:4M yr−1 and oxygen abundance 12+log(O/H) = 8.8.We then use these values to compare with other transients, eventually ruling outthat the progenitor is an active galactic nucleus and finding little likelihood thatthe host galaxy would also host a long gamma-ray burst. However the galaxy mayalso host short gamma-ray bursts, SNe Ia or core-collapse supernovae.