The Low Mass Dwarf Host Galaxy of Non-Repeating FRB 20230708A
August R. Muller (1, 2, 3), Alexa C. Gordon (4), Stuart D. Ryder (5), Alexandra G. Mannings (6), J. Xavier Prochaska (6, 7, 8), Keith W. Bannister (9, 10), A. Bera (11), Shivani Bhandari (9), N. D. R. Bhat (11), Adam T. Deller (12), Wen-fai Fong (4), Marcin Glowacki (13, 14)

TL;DR
This paper reports the discovery of the faintest non-repeating FRB host galaxy, characterized by very low luminosity, stellar mass, star formation rate, and metallicity, suggesting FRBs can originate in the universe's faintest, metal-poor galaxies.
Contribution
It presents the first detailed spectroscopic analysis of a very low-luminosity, metal-poor non-repeating FRB host galaxy, expanding understanding of FRB environments.
Findings
Host galaxy is the lowest-luminosity non-repeating FRB host to date.
Host galaxy has very low metallicity and star formation rate.
FRBs can originate in extremely faint, metal-poor galaxies.
Abstract
We present Very Large Telescope/X-Shooter spectroscopy for the host galaxies of 12 fast radio bursts (FRBs) detected by the Australian SKA Pathfinder (ASKAP) observed through the ESO Large Programme "FURBY", which imposes strict selection criteria on the included FRBs and their host galaxies to produce a homogeneous and well-defined sample. We describe the data reduction and analysis of these spectra and report their redshifts, line-emission fluxes, and derived host properties. From the present sample, this paper focuses on the faint host of FRB () identified at low redshift (). This indicates an intrinsically very low-luminosity galaxy (), making it the lowest-luminosity non-repeating FRB host to date by a factor of , and slightly dimmer than the lowest-luminosity host for repeating FRBs. Our SED fitting analysis reveals a…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
