The Demographics, stellar populations, and star formation histories of fast radio burst host galaxies: implications for the progenitors

Alexa C. Gordon, Wen-fai Fong, Charles D. Kilpatrick, Tarraneh Eftekhari, Joel Leja, J. Xavier Prochaska, Anya E. Nugent, Shivani Bhandari, Peter K. Blanchard, Manisha Caleb, Cherie K. Day, Adam T. Deller, Yuxin Dong, Marcin Glowacki, Kelly Gourdji, Alexandra G. Mannings, Elizabeth K. Mahoney, Lachlan Marnoch, Adam A. Miller, Kerry PatersonJillian C. Rastinejad, Stuart D. Ryder, Elaine M. Sadler, Danica R. Scott, Huei Sears, Ryan M. Shannon, Sunil Simha, Benjamin W. Stappers, Nicolas Tejos

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Abstract

We present a comprehensive catalog of observations and stellar population properties for 23 highly secure host galaxies of fast radio bursts (FRBs). Our sample comprises 6 repeating FRBs and 17 apparent nonrepeaters. We present 82 new photometric and 8 new spectroscopic observations of these hosts. Using stellar population synthesis modeling and employing nonparametric star formation histories (SFHs), we find that FRB hosts have a median stellar mass of ≈109.9 M, mass-weighted age ≈5.1 Gyr, and ongoing star formation rate ≈1.3 M yr-1 but span wide ranges in all properties. Classifying the hosts by degree of star formation, we find that 87% (20 of 23 hosts) are star-forming, two are transitioning, and one is quiescent. The majority trace the star-forming main sequence of galaxies, but at least three FRBs in our sample originate in less-active environments (two nonrepeaters and one repeater). Across all modeled properties, we find no statistically significant distinction between the hosts of repeaters and nonrepeaters. However, the hosts of repeating FRBs generally extend to lower stellar masses, and the hosts of nonrepeaters arise in more optically luminous galaxies. While four of the galaxies with the clearest and most prolonged rises in their SFHs all host repeating FRBs, demonstrating heightened star formation activity in the last ≲100 Myr, one nonrepeating host shows this SFH as well. Our results support progenitor models with short delay channels (i.e., magnetars formed via core-collapse supernova) for most FRBs, but the presence of some FRBs in less-active environments suggests a fraction form through more delayed channels.

Original languageEnglish
Article number80
Pages (from-to)1-40
Number of pages40
JournalAstrophysical Journal
Volume954
Issue number1
DOIs
Publication statusPublished - 1 Sept 2023

Bibliographical note

Copyright © 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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