| Title: |
A Fast Radio Burst in a Compact Galaxy Group at $z$~1 |
| Authors: |
Gordon, Alexa C., Fong, Wen-fai, Simha, Sunil, Dong, Yuxin, Kilpatrick, Charles D., Deller, Adam T., Ryder, Stuart D., Eftekhari, Tarraneh, Glowacki, Marcin, Marnoch, Lachlan, Muller, August R., Nugent, Anya E., Palmese, Antonella, Prochaska, J. Xavier, Rafelski, Marc, Shannon, Ryan M., Tejos, Nicolas |
| Publication Year: |
2023 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Astrophysics of Galaxies |
| More Details: |
FRB 20220610A is a high-redshift Fast Radio Burst (FRB) that has not been observed to repeat. Here, we present rest-frame UV and optical $\textit{Hubble Space Telescope}$ observations of the field of FRB 20220610A. The imaging reveals seven extended sources, one of which we identify as the most likely host galaxy with a spectroscopic redshift of $z$=1.017. We spectroscopically confirm at least three additional sources to be at the same redshift, and identify the system as a compact galaxy group with possible signs of interaction among group members. We determine the host of FRB 20220610A to be a star-forming galaxy with stellar mass of $\approx10^{9.7}\,M_{\odot}$, mass-weighted age of $\approx2.6$~Gyr, and star formation rate (integrated over the last 100 Myr) of $\approx1.7$~M$_{\odot}$~yr$^{-1}$. These host properties are commensurate with the star-forming field galaxy population at z~1 and trace their properties analogously to the population of low-$z$ FRB hosts. Based on estimates of the total stellar mass of the galaxy group, we calculate a fiducial contribution to the observed Dispersion Measure (DM) from the intragroup medium of $\approx 110-220$ $\rm pc \, cm^{-3}$ (rest-frame). This leaves a significant excess of $500^{+272}_{-109}$ $\rm pc \, cm^{-3}$ (in the observer frame), with additional sources of DM possibly originating from the circumburst environment, host galaxy interstellar medium, and/or foreground structures along the line of sight. Given the low occurrence rates of galaxies in compact groups, the discovery of an FRB in such a group demonstrates a rare and novel environment in which FRBs can occur.
Comment: 24 pages, 8 figures, 2 tables, submitted |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2311.10815 |
| Accession Number: |
edsarx.2311.10815 |
| Database: |
arXiv |
