The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
arxiv(2023)
摘要
We present GeMS/GSAOI observations of five fast radio burst (FRB) host
galaxies with sub-arcsecond localizations. We examine and quantify their
spatial distributions and locations with respect to their host galaxy light
distributions, finding a median host-normalized offset of 2.09 r_e and in
fainter regions of the host. When combined with the FRB sample from Mannings et
al. (2021), we find that FRBs are statistically distinct from Ca-rich
transients in terms of light and from SGRBs and LGRBs in terms of
host-normalized offset. We further find that most FRBs are in regions of
elevated local stellar mass surface densities in comparison to the mean global
values of their hosts. This, in combination with the combined FRB sample trace
the distribution of stellar mass, points towards a possible similarity of the
environments of CC-SNe and FRBs. We also find that 4/5 FRB hosts exhibit
distinct spiral arm features, and the bursts originating from such hosts tend
to appear on or close to the spiral structure of their hosts, with a median
distance of 0.53 kpc. With many well-localized FRB detections looming on the
horizon, we will be able to better characterize the properties of FRB
environments relative to their host galaxies and other transient classes.
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