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Article Dans Une Revue The Astrophysical Journal Année : 2021

Polarization Pipeline for Fast Radio Bursts Detected by CHIME/FRB

R. Mckinven
K. Masui
D. Cubranic
B. Gaensler
C. Ng
T. Cassanelli
M. Rahman
I. Stairs

Résumé

Polarimetric observations of fast radio bursts (FRBs) are a powerful resource for better understanding these mysterious sources by directly probing the emission mechanism of the source and the magneto-ionic properties of its environment. We present a pipeline for analyzing the polarized signal of FRBs captured by the triggered baseband recording system operating on the FRB survey of The Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB). Using a combination of simulated and real FRB events, we summarize the main features of the pipeline and highlight the dominant systematics affecting the polarized signal. We compare parametric (QU-fitting) and non-parametric (rotation measure synthesis) methods for determining the Faraday rotation measure (RM) and find the latter method susceptible to systematic errors from known instrumental effects of CHIME/FRB observations. These errors include a leakage artifact that appears as polarized signal near RM ∼ 0 rad m −2 and an RM sign ambiguity introduced by path length differences in the system’s electronics. We apply the pipeline to a bright burst previously reported (FRB 20191219F), detecting an RM of +6.074 ± 0.006 ± 0.050 rad m −2 with a significant linear polarized fraction (≳0.87) and strong evidence for a non-negligible circularly polarized component. Finally, we introduce an RM search method that employs a phase-coherent de-rotation algorithm to correct for intra-channel depolarization in data that retain electric field phase information and successfully apply it to an unpublished FRB, FRB 20200917A, measuring an RM of −1294.47 ± 0.10 ± 0.05 rad m −2 (the second largest unambiguous RM detection from any FRB source observed to date).
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Dates et versions

hal-04447841 , version 1 (08-02-2024)

Identifiants

Citer

R. Mckinven, Daniele Michilli, K. Masui, D. Cubranic, B. Gaensler, et al.. Polarization Pipeline for Fast Radio Bursts Detected by CHIME/FRB. The Astrophysical Journal, 2021, 920 (2), pp.138. ⟨10.3847/1538-4357/ac126a⟩. ⟨hal-04447841⟩
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