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Bhardwaj, M.; Kirichenko, A. Yu; Michilli, D.; Mayya, Y. D.; Kaspi, V. M.; Gaensler, B. M.; Rahman, M.; Tendulkar, S. P.; Fonseca, E.; Josephy, Alexander; Leung, C.; Merryfield, Marcus; Petroff, Emily; Pleunis, Z.; Sanghavi, Pranav; Scholz, P.; Shin, K.; Smith, Kendrick M.; Stairs, I. H.
Astrophysical journal. Letters, 10/2021, Volume: 919, Issue: 2Journal Article
Abstract We report on the host association of FRB 20181030A, a repeating fast radio burst (FRB) with a low dispersion measure (103.5 pc cm −3 ) discovered by the CHIME/FRB Collaboration et al. Using baseband voltage data saved for its repeat bursts, we localize the FRB to a sky area of 5.3 arcmin 2 (90% confidence). Within the FRB localization region, we identify NGC 3252 as the most promising host with an estimated chance-coincidence probability <2.5 × 10 −3 . Moreover, we do not find any other galaxy with M r < −15 AB mag within the localization region to the maximum estimated FRB redshift of 0.05. This rules out a dwarf host 5 times less luminous than any FRB host discovered to date. NGC 3252 is a star-forming spiral galaxy and at a distance of ≈20 Mpc, it is one of the closest FRB hosts discovered thus far. From our archival radio data search, we estimate a 3 σ upper limit on the luminosity of a persistent compact radio source (source size < 0.3 kpc at 20 Mpc) at 3 GHz to be 2 × 10 26 erg s −1 Hz −1 , at least 1500 times smaller than that of the FRB 20121102A persistent radio source. We also argue that a population of young millisecond magnetars alone cannot explain the observed volumetric rate of repeating FRBs. Finally, FRB 20181030A is a promising source for constraining FRB emission models due to its proximity and we strongly encourage its multi-wavelength follow-up.
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