Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Alice P. Curtin, Ketan R. Sand, Ziggy Pleunis, Naman Jain, Victoria Kaspi
| Summary:
The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst
(CHIME/FRB) project has discovered the most repeating fast radio burst (FRB)
sources of any telescope. However, most of the physical conclusions derived
from this sample are based on data with a time resolution of $sim$1 ms. In
this work, we present for the first time a morphological analysis of the raw
voltage data for 118 bursts from 32 of CHIME/FRB’s repeating sources. We do not
find any significant correlations amongst fluence, dispersion measure (DM),
burst rate, and burst duration. Performing the first large-scale morphological
comparison at timescales down to microseconds between our repeating sources and
125 non-repeating FRBs, we find that repeaters are narrower in frequency and
broader in duration than non-repeaters, supporting previous findings. However,
we find that the duration-normalized sub-burst widths of the two populations
are consistent, possibly suggesting a shared physical emission mechanism.
Additionally, we find that the spectral fluences of the two are consistent.
When combined with the larger bandwidths and previously found larger DMs of
non-repeaters, this suggests that non-repeaters may have higher intrinsic
specific energies than repeating FRBs. We do not find any consistent increase
or decrease in the DM ($lessapprox 1$ pc cm$^{-3}$ yr$^{-1}$) and scattering
timescales ($lessapprox 2$ ms yr$^{-1}$) of our sources over $sim2-4$ year
periods.
| Search Query: ArXiv Query: search_query=au:”Kiyoshi W. Masui”&id_list=&start=0&max_results=3