Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Mandana Amiri, Daniel Amouyal, Bridget C. Andersen, Shion Andrew, Kevin Bandura
| Summary:
We present the first catalog of fast radio burst (FRB) host galaxies from
CHIME/FRB Outriggers, selected uniformly in the radio and the optical by
localizing 81 new bursts to 2” x ~60” accuracy using CHIME and the KKO
Outrigger, located 66 km from CHIME. Of the 81 localized bursts, we use the
Probabilistic Association of Transients to their Hosts (PATH) algorithm to
securely identify 21 new FRB host galaxies, and compile spectroscopic redshifts
for 19 systems, 15 of which are newly obtained via spectroscopic observations.
The most nearby source is FRB 20231229A, at a distance of 90 Mpc. One burst in
our sample is from a previously reported repeating source in a galaxy merger
(FRB 20190303A). Three new FRB host galaxies (FRBs 20230203A, 20230703A, and
20231206A) are found towards X-ray and optically selected galaxy clusters,
potentially doubling the sample of known galaxy cluster FRBs. A search for
radio counterparts reveals that FRB 20231128A is associated with a luminous
persistent radio source (PRS) candidate with high significance ($P_{cc} sim
10^{-2}$). If its compactness is confirmed, it would be the nearest known
compact PRS at $z = 0.1079$. Our catalog significantly increases the statistics
of the Macquart relation at low redshifts ($z < 0.2$). In the near future, the
completed CHIME/FRB Outriggers array will produce hundreds of FRBs localized
with very long baseline interferometry (VLBI). This will significantly expand
the known sample and pave the way for future telescopes relying on VLBI for FRB
localization.
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