Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Ayush Pandhi, Ziggy Pleunis, Ryan Mckinven, B. M. Gaensler, Jianing Su
| Summary:
We present a 400-800 MHz polarimetric analysis of 128 non-repeating fast
radio bursts (FRBs) from the first CHIME/FRB baseband catalog, increasing the
total number of FRB sources with polarization properties by a factor of ~3. Of
the 128 sources, 89 FRBs have >6${sigma}$ linearly polarized detections, 29
FRBs fall below this significance threshold and are deemed linearly
unpolarized, and for 10 FRBs the polarization data are contaminated by
instrumental polarization. For the 89 polarized FRBs, we find Faraday rotation
measure (RM) amplitudes, after subtracting approximate Milky Way contributions,
in the range 0.5-1160 rad m$^{-2}$ with a median of 53.8 rad m$^{-2}$. Most
non-repeating FRBs in our sample have RMs consistent with Milky Way-like host
galaxies and their linear polarization fractions range from ${leq}$10% to 100%
with a median of 63%. The non-repeater RMs and linear polarization fraction
distributions are consistent with those of repeating FRBs. We see marginal
evidence that non-repeating FRBs have more constraining lower limits than
repeating FRBs for the host electron-density-weighted line-of-sight magnetic
field strength. We classify the non-repeating FRB polarization position angle
(PA) profiles into four archetypes: (i) single component with constant PA (57%
of the sample), (ii) single component with variable PA (10%), (iii) multiple
components with a single constant PA (22%), and (iv) multiple components with
different or variable PAs (11%). We see no evidence for population-wide
frequency-dependent depolarization and, therefore, the spread in the
distribution of fractional linear polarization is likely intrinsic to the FRB
emission mechanism.
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