Publication

Faraday conversion and magneto-ionic variations in fast radio bursts

Vedantham, H. K. & Ravi, J., May-2019, In : Monthly Notices of the Royal Astronomical Society. 485, 1, p. L78-L82 5 p.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Vedantham, H. K., & Ravi, J. (2019). Faraday conversion and magneto-ionic variations in fast radio bursts. Monthly Notices of the Royal Astronomical Society, 485(1), L78-L82. https://doi.org/10.1093/mnrasl/slz038

Author

Vedantham, H. K. ; Ravi, Jyotsna. / Faraday conversion and magneto-ionic variations in fast radio bursts. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 485, No. 1. pp. L78-L82.

Harvard

Vedantham, HK & Ravi, J 2019, 'Faraday conversion and magneto-ionic variations in fast radio bursts', Monthly Notices of the Royal Astronomical Society, vol. 485, no. 1, pp. L78-L82. https://doi.org/10.1093/mnrasl/slz038

Standard

Faraday conversion and magneto-ionic variations in fast radio bursts. / Vedantham, H. K.; Ravi, Jyotsna.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, No. 1, 05.2019, p. L78-L82.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Vedantham HK, Ravi J. Faraday conversion and magneto-ionic variations in fast radio bursts. Monthly Notices of the Royal Astronomical Society. 2019 May;485(1):L78-L82. https://doi.org/10.1093/mnrasl/slz038


BibTeX

@article{79d733a4125842949bb6d43ff1bd1a3d,
title = "Faraday conversion and magneto-ionic variations in fast radio bursts",
abstract = "The extreme, time-variable Faraday rotation observed in the repeating fast radio burst (FRB) 121102 and its associated persistent synchrotron source demonstrates that some FRBs originate in dense, dynamic, and possibly relativistic magneto-ionic environments. Besides rotation of the linear polarization vector (Faraday rotation), such media can generally convert linear to circular polarization (Faraday conversion). We use non-detection of Faraday conversion, and the temporal variation in Faraday rotation and dispersion in bursts from FRB 121102 to constrain models where the progenitor inflates a relativistic nebula (persistent source) confined by a cold dense medium (e.g. supernova ejecta). We find that the persistent synchrotron source, if composed of an electron-proton plasma, must be an admixture of relativistic and non-relativistic (Lorentz factor gamma <5) electrons. Furthermore, we independently constrain the magnetic field in the cold confining medium, which provides the Faraday rotation, to be between 10 and 30 mG. This value is close to the equipartition magnetic field of the confined persistent source implying a self-consistent and overconstrained model that can explain the observations.",
keywords = "polarization, radiative transfer, radio continuum: general, CIRCULAR-POLARIZATION",
author = "Vedantham, {H. K.} and Jyotsna Ravi",
year = "2019",
month = "5",
doi = "10.1093/mnrasl/slz038",
language = "English",
volume = "485",
pages = "L78--L82",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - Faraday conversion and magneto-ionic variations in fast radio bursts

AU - Vedantham, H. K.

AU - Ravi, Jyotsna

PY - 2019/5

Y1 - 2019/5

N2 - The extreme, time-variable Faraday rotation observed in the repeating fast radio burst (FRB) 121102 and its associated persistent synchrotron source demonstrates that some FRBs originate in dense, dynamic, and possibly relativistic magneto-ionic environments. Besides rotation of the linear polarization vector (Faraday rotation), such media can generally convert linear to circular polarization (Faraday conversion). We use non-detection of Faraday conversion, and the temporal variation in Faraday rotation and dispersion in bursts from FRB 121102 to constrain models where the progenitor inflates a relativistic nebula (persistent source) confined by a cold dense medium (e.g. supernova ejecta). We find that the persistent synchrotron source, if composed of an electron-proton plasma, must be an admixture of relativistic and non-relativistic (Lorentz factor gamma <5) electrons. Furthermore, we independently constrain the magnetic field in the cold confining medium, which provides the Faraday rotation, to be between 10 and 30 mG. This value is close to the equipartition magnetic field of the confined persistent source implying a self-consistent and overconstrained model that can explain the observations.

AB - The extreme, time-variable Faraday rotation observed in the repeating fast radio burst (FRB) 121102 and its associated persistent synchrotron source demonstrates that some FRBs originate in dense, dynamic, and possibly relativistic magneto-ionic environments. Besides rotation of the linear polarization vector (Faraday rotation), such media can generally convert linear to circular polarization (Faraday conversion). We use non-detection of Faraday conversion, and the temporal variation in Faraday rotation and dispersion in bursts from FRB 121102 to constrain models where the progenitor inflates a relativistic nebula (persistent source) confined by a cold dense medium (e.g. supernova ejecta). We find that the persistent synchrotron source, if composed of an electron-proton plasma, must be an admixture of relativistic and non-relativistic (Lorentz factor gamma <5) electrons. Furthermore, we independently constrain the magnetic field in the cold confining medium, which provides the Faraday rotation, to be between 10 and 30 mG. This value is close to the equipartition magnetic field of the confined persistent source implying a self-consistent and overconstrained model that can explain the observations.

KW - polarization

KW - radiative transfer

KW - radio continuum: general

KW - CIRCULAR-POLARIZATION

U2 - 10.1093/mnrasl/slz038

DO - 10.1093/mnrasl/slz038

M3 - Article

VL - 485

SP - L78-L82

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -

ID: 108468180