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Morphology of 32 Repeating Fast Radio Burst Sources at Microsecond Time Scales with CHIME/FRB
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Morphology of 32 Repeating Fast Radio Burst Sources at Microsecond Time Scales with CHIME/FRB
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Paper
Morphology of 32 Repeating Fast Radio Burst Sources at Microsecond Time Scales with CHIME/FRB
2024
Overview
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.
Publisher
Cornell University Library, arXiv.org
Subject
