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Mannings et al. present Hubble Space Telescope ultraviolet and infrared
observations of eight fast radio burst (FRB) host galaxies with
sub-arcsecond localizations, including the hosts of three known
repeating FRBs. They find that FRBs occur at moderate offsets
from the galaxy core and occur on fainter regions of their hosts in terms
of IR light. The FRBs do not clearly
trace the distributions of any other transient population with known
progenitors, such as long or short gamma-ray bursts and supernovae.
They find that five of the 8 FRB
hosts exhibit clear spiral arm features in IR light, and that the
positions of all well-localized FRBs located in such hosts are
consistent with their spiral arms, although not on their brightest
regions. The results do not strongly support models proposed which have
the primary progenitor channel of FRBs being connected either with the most massive
stars, or with neutron star mergers.
The image above shows HST imaging of the host galaxy of FRB 190608, a
fast radio burst discovered and localised with ASKAP.
The black ellipse in each image denotes the FRB position.
The results will be published in the Astrophysical Journal.
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