Faraday depolarization and induced circular polarization by multipath propagation with application to FRBs

被引：52

作者：

Beniamini, Paz ^{[1
,2
,3
]}

Kumar, Pawan ^{[4
]}

Narayan, Ramesh ^{[5
,6
]}

机构：

[1] Open Univ Israel, Dept Nat Sci, 1 Univ Rd, IL-43107 Raanana, Israel

[2] Open Univ Israel, Astrophys Res Ctr, Open Univ ARCO, POB 808, IL-43537 Raanana, Israel

[3] CALTECH, Walter Burke Inst Theoret Phys, Theoret Astrophys, Mail Code 350-17, Pasadena, CA 91125 USA

[4] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[5] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[6] Black Hole Initiat Harvard Univ, Ctr Astrophys, 20 Garden St, Cambridge, MA 02138 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 510卷 / 03期

关键词：

polarization; ISM: structure; FAST RADIO-BURST; POLARIMETRY; ENVIRONMENT; ARRAY;

D O I：

10.1093/mnras/stab3730

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe how the observed polarization properties of an astronomical object are related to its intrinsic polarization properties and the finite temporal and spectral resolutions of the observing device. Moreover, we discuss the effect that a scattering screen, with non-zero magnetic field, between the source and observer has on the observed polarization properties. We show that the polarization properties are determined by the ratio of observing bandwidth and coherence bandwidth of the scattering screen and the ratio of temporal resolution of the instrument and the variability time of screen, as long as the length over which the Faraday rotation induced by the screen changes by similar to pi is smaller than the size of the screen visible to the observer. We describe the conditions under which a source that is 100 per cent linearly polarized intrinsically might be observed as partially depolarized, and how the source's temporal variability can be distinguished from the temporal variability induced by the scattering screen. In general, linearly polarized waves passing through a magnetized scattering screen can develop a significant circular polarization. We apply the work to the observed polarization properties of a few fast radio bursts (FRBs), and outline potential applications to pulsars.

引用

页码：4654 / 4668

页数：15

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