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Deep Synoptic Array Science: Discovery of the Host Galaxy of FRB 20220912A

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Title: Deep Synoptic Array Science: Discovery of the Host Galaxy of FRB 20220912A
Authors: Vikram Ravi, Morgan Catha, Ge Chen, Liam Connor, Jakob T. Faber, James W. Lamb, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Rick Hobbs, David Hodge, Mark Hodges, Casey Law, Paul Rasmussen, Kritti Sharma, Myles B. Sherman, Jun Shi, Dana Simard, Reynier Squillace, Sander Weinreb, David P. Woody, Nitika Yadlapalli, The Deep Synoptic Array team, Tomas Ahumada, Dillon Dong, Christoffer Fremling, Yuping Huang, Viraj Karambelkar, Jessie M. Miller
Source: The Astrophysical Journal Letters, Vol 949, Iss 1, p L3 (2023)
Publisher Information: IOP Publishing, 2023.
Publication Year: 2023
Collection: LCC:Astrophysics
Subject Terms: Compact objects, Radio interferometry, Radio telescopes, Radio transient sources, Astrophysics, QB460-466
More Details: We report the detection and interferometric localization of the repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with the Deep Synoptic Array (DSA-110). Two bursts were detected from FRB 20220912A, one each on 2022 October 18 and 2022 October 25. The best-fit position is (R.A. J2000, decl. J2000) = (23:09:04.9, +48:42:25.4), with a 90% confidence error ellipse with radii ±2″ and ±1″ in R.A. and decl., respectively. The two bursts are polarized, and we find a Faraday rotation measure that is consistent with the low value of +0.6 rad m ^−2 reported by CHIME/FRB. The DSA-110 localization overlaps with the galaxy PSO J347.2702+48.7066 at a redshift z = 0.0771, which we identify as the likely host. PSO J347.2702+48.7066 has a stellar mass of approximately 10 ^10 M _⊙ , modest internal dust extinction, and a star formation rate likely in excess of 0.1 M _⊙ yr ^−1 . The host-galaxy contribution to the dispersion measure is likely ≲50 pc cm ^−3 . The FRB 20220912A source is therefore likely viewed along a tenuous plasma column through the host galaxy.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2041-8213
2041-8205
Relation: https://doaj.org/toc/2041-8205
DOI: 10.3847/2041-8213/acc4b6
Access URL: https://doaj.org/article/53680d4a6a1c470fb68ce220f591abff
Accession Number: edsdoj.53680d4a6a1c470fb68ce220f591abff
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  Data: The Astrophysical Journal Letters, Vol 949, Iss 1, p L3 (2023)
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  Data: We report the detection and interferometric localization of the repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with the Deep Synoptic Array (DSA-110). Two bursts were detected from FRB 20220912A, one each on 2022 October 18 and 2022 October 25. The best-fit position is (R.A. J2000, decl. J2000) = (23:09:04.9, +48:42:25.4), with a 90% confidence error ellipse with radii ±2″ and ±1″ in R.A. and decl., respectively. The two bursts are polarized, and we find a Faraday rotation measure that is consistent with the low value of +0.6 rad m ^−2 reported by CHIME/FRB. The DSA-110 localization overlaps with the galaxy PSO J347.2702+48.7066 at a redshift z = 0.0771, which we identify as the likely host. PSO J347.2702+48.7066 has a stellar mass of approximately 10 ^10 M _⊙ , modest internal dust extinction, and a star formation rate likely in excess of 0.1 M _⊙ yr ^−1 . The host-galaxy contribution to the dispersion measure is likely ≲50 pc cm ^−3 . The FRB 20220912A source is therefore likely viewed along a tenuous plasma column through the host galaxy.
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