WALLABY Pilot Survey: H i in the Host Galaxy of a Fast Radio Burst

M. Glowacki, K. Lee-Waddell, A. T. Deller, N. Deg, A. C. Gordon, J. A. Grundy, L. Marnoch, A. X. Shen, S. D. Ryder, R. M. Shannon, O. I. Wong, H. Dénes, B. S. Koribalski, C. Murugeshan, J. Rhee, T. Westmeier, S. Bhandari, A. Bosma, B. W. Holwerda, J. X. Prochaska

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We report on the commensal ASKAP detection of a fast radio burst (FRB), FRB 20211127I, and the detection of neutral hydrogen (H i) emission in the FRB host galaxy, WALLABY J131913-185018 (hereafter W13-18). This collaboration between the CRAFT and WALLABY survey teams marks the fifth, and most distant, FRB host galaxy detected in H i, not including the Milky Way. We find that W13-18 has an H i mass of M HI = 6.5 × 109 M , an H i-to-stellar mass ratio of 2.17, and coincides with a continuum radio source of flux density at 1.4 GHz of 1.3 mJy. The H i global spectrum of W13-18 appears to be asymmetric, albeit the H i observation has a low signal-to-noise ratio (S/N), and the galaxy itself appears modestly undisturbed. These properties are compared to the early literature of H i emission detected in other FRB hosts to date, where either the H i global spectra were strongly asymmetric, or there were clearly disrupted H i intensity map distributions. W13-18 lacks a sufficient S/N to determine whether it is significantly less asymmetric in its H i distribution than previous examples of FRB host galaxies. However, there are no strong signs of a major interaction in the optical image of the host galaxy that would stimulate a burst of star formation and hence the production of putative FRB progenitors related to massive stars and their compact remnants.

Original languageEnglish
Article number25
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 1 May 2023


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