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. 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 <10% to 100% with a median of 63%. 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. Finally, we present a novel method to derive
redshift lower limits for polarized FRBs without host galaxy identification and
test this method on 20 FRBs with independently measured redshifts.
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