Deep Synoptic Array Science: Polarimetry of 25 New Fast Radio Bursts Provides Insights into Their Origins

被引：20

作者：

Sherman, Myles B. ^{[1
]}

Connor, Liam ^{[1
]}

Ravi, Vikram ^{[1
,2
]}

Law, Casey ^{[1
,2
]}

Chen, Ge ^{[1
]}

Catha, Morgan ^{[2
]}

Faber, Jakob T. ^{[1
]}

Hallinan, Gregg ^{[1
,2
]}

Harnach, Charlie ^{[2
]}

Hellbourg, Greg ^{[1
,2
]}

Hobbs, Rick ^{[2
]}

Hodge, David ^{[1
]}

Hodges, Mark ^{[2
]}

Lamb, James W. ^{[2
]}

Rasmussen, Paul ^{[2
]}

Sharma, Kritti ^{[1
]}

Shi, Jun ^{[1
]}

Simard, Dana ^{[1
]}

Somalwar, Jean ^{[1
]}

Squillace, Reynier ^{[3
]}

Weinreb, Sander ^{[1
]}

Woody, David P. ^{[2
]}

Yadlapalli, Nitika ^{[1
]}

机构：

[1] CALTECH, Cahill Ctr Astron & Astrophys, MC 249-17, Pasadena, CA 91125 USA

[2] CALTECH, Owens Valley Radio Observ, Big Pine, CA 93513 USA

[3] Univ Virginia, Dept Astron, 530 McCormick Rd, Charlottesville, VA 23455 USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 964卷 / 02期

基金：

美国国家科学基金会;

关键词：

MAGNETOSPHERIC CURVATURE RADIATION; FARADAY-ROTATION MEASURES; POLARIZATION PROPERTIES; CIRCULAR-POLARIZATION; PULSAR POLARIZATION; MAGNETIC-FIELD; HOST GALAXY; EMISSION; FRB; DEPOLARIZATION;

D O I：

10.3847/1538-4357/ad275e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a full-polarization analysis of the first 25 as yet nonrepeating fast radio bursts (FRBs) detected at 1.4 GHz by the 110-antenna Deep Synoptic Array (DSA-110) during commissioning observations. We present details of the data-reduction, calibration, and analysis procedures developed for this novel instrument. Faraday rotation measures (RMs) are searched between +/- 10(6) rad m(-2) and detected for 20 FRBs, with magnitudes ranging from 4 to 4670 rad m(-2). Fifteen out of 25 FRBs are consistent with 100% polarization, 10 of which have high (>= 70%) linear-polarization fractions and two of which have high (>= 30%) circular-polarization fractions. Our results disfavor multipath RM scattering as a dominant depolarization mechanism. Polarization-state and possible RM variations are observed in the four FRBs with multiple subcomponents. We combine the DSA-110 sample with polarimetry of previously published FRBs, and compare the polarization properties of FRB subpopulations and FRBs with Galactic pulsars. Although FRB polarization fractions are typically higher than those of Galactic pulsars, and cover a wider range than those of pulsar single pulses, they resemble those of the youngest (characteristic ages <10(5) yr) pulsars. Our results support a scenario wherein FRB emission is intrinsically highly linearly polarized, and propagation effects can result in conversion to circular polarization and depolarization. Young pulsar emission and magnetospheric propagation geometries may form a useful analogy for the origin of FRB polarization.

引用

页数：39

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