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Limits on precursor and afterglow radio emission from a fast radio burst in a star-forming galaxy | | Shivani Bhandari
; Keith W. Bannister
; Emil Lenc
; Hyerin Cho
; Ron Ekers
; Cherie K.Day
; Adam T.Deller
; Chris Flynn
; Clancy W. James
; Jean-Pierre Macquart
; Elizabeth K. Mahony
; Lachlan Marnoch
; Vanessa A. Moss
; Chris Phillips
; J. Xavier Prochaska
; Hao Qiu
; Stuart D. Ryder
; Ryan M. Shannon
; Nicolas Tejos
; O. Ivy Wong
; | | Date: |
28 Aug 2020 | | Abstract: | We present a new fast radio burst at 920 MHz discovered during commensal
observations conducted with the Australian Square Kilometre Array Pathfinder
(ASKAP) as part of the Commensal Real-time ASKAP Fast Transients (CRAFT)
survey. FRB 191001 was detected at a dispersion measure (DM) of 506.92(4) pc
cm$^{-3}$ and its measured fluence of 143(15) Jy ms is the highest of the
bursts localized to host galaxies by ASKAP to date. The sub-arcsecond
localisation of the FRB provided by ASKAP reveals that the burst originated in
the outskirts of a highly star-forming spiral in a galaxy pair at redshift
$z=0.2340(1)$. Radio observations show no evidence for a compact persistent
radio source associated with the FRB 191001 above a flux density of $15mu$Jy.
However, we detect diffuse synchrotron radio emission from the disk of the host
galaxy that we ascribe to ongoing star formation. FRB 191001 was also detected
as an image-plane transient in a single 10-s snapshot with a flux density of
19.3 mJy in the low-time-resolution visibilities obtained simultaneously with
CRAFT data. The commensal observation facilitated a search for repeating and
slowly varying radio emissions 8 hrs before and 1 hr after the burst. We found
no variable radio emission on timescales ranging from 1 ms to 1.4 hr. We report
our upper limits and briefly review FRB progenitor theories in the literature
which predict radio afterglows. Our data are still only weakly constraining of
any afterglows at the redshift of the FRB. Future commensal observations of
more nearby and bright FRBs will potentially provide stronger constraints. | | Source: | arXiv, 2008.12488 | | Services: | Forum | Review | PDF | Favorites | |
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