Mao, J;
Britto, RJ;
Buckley, DAH;
Covino, S;
D'Avanzo, P;
Kuin, NPM;
(2021)
On the Polarized Absorption Lines in Gamma-Ray Burst Optical Afterglows.
Astrophysical Journal
, 914
(2)
10.3847/1538-4357/abfdc6.
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Abstract
Spectropolarimetric measurements of gamma-ray burst (GRB) optical afterglows contain polarization information for both continuum and absorption lines. Based on the Zeeman effect, an absorption line in a strong magnetic field is polarized and split into a triplet. In this paper, we solve the polarization radiative transfer equations of the absorption lines, and obtain the degree of linear polarization of the absorption lines as a function of the optical depth. In order to effectively measure the degree of linear polarization for the absorption lines, a magnetic field strength of at least 103 G is required. The metal elements that produce the polarized absorption lines should be sufficiently abundant and have large oscillation strengths or Einstein absorption coefficients. We encourage both polarization measurements and high-dispersion observations of the absorption lines in order to detect the triplet structure in early GRB optical afterglows.
| Type: | Article |
|---|---|
| Title: | On the Polarized Absorption Lines in Gamma-Ray Burst Optical Afterglows |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/abfdc6 |
| Publisher version: | https://doi.org/10.3847/1538-4357/abfdc6 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10131284 |
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