Polarization properties of photospheric emission from relativistic, collimated outflows

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dc.contributor.author Lundman, C.
dc.contributor.author Pe'er, Asaf
dc.contributor.author Ryde, F.
dc.date.accessioned 2017-11-07T09:38:53Z
dc.date.available 2017-11-07T09:38:53Z
dc.date.issued 2014
dc.identifier.citation Lundman, C., Pe'er, A. and Ryde, F. (2014) 'Polarization properties of photospheric emission from relativistic, collimated outflows', Monthly Notices of the Royal Astronomical Society, 440(4), pp. 3292-3308. doi: 10.1093/mnras/stu457 en
dc.identifier.volume 440
dc.identifier.issued 4
dc.identifier.startpage 3292
dc.identifier.endpage 3308
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966
dc.identifier.uri http://hdl.handle.net/10468/4955
dc.identifier.doi 10.1093/mnras/stu457
dc.description.abstract We consider the polarization properties of photospheric emission originating in jets consisting of a highly relativistic core of opening angle theta(j) and Lorentz factor Gamma(0), and a surrounding shear layer where the Lorentz factor is decreasing as a power law of index p with angle from the jet axis. We find significant degrees of linear polarization for observers located at viewing angles theta(v) greater than or similar to theta(j). In particular, the polarization degree of emission from narrow jets (theta(j) approximate to 1/Gamma(0)) with steep Lorentz factor gradients (p greater than or similar to 4) reaches similar to 40 per cent. The angle of polarization may shift by pi/2 for time-variable jets. The spectrum below the thermal peak of the polarized emission appears non-thermal due to aberration of light, without the need for additional radiative processes or energy dissipation. Furthermore, above the thermal peak a power law of photons forms due to Comptonization of photons that repeatedly scatter between regions of different Lorentz factor before escaping. We show that polarization degrees of a few tens of per cent and broken power-law spectra are natural in the context of photospheric emission from structured jets. Applying the model to gamma-ray bursts, we discuss expected correlations between the spectral shape and the polarization degree of the prompt emission. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.relation.uri https://academic.oup.com/mnras/article/440/4/3292/1104750/Polarization-properties-of-photospheric-emission
dc.rights © 2014, the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society en
dc.subject Polarization en
dc.subject Radiation mechanisms en
dc.subject Thermal en
dc.subject Radiative transfer en
dc.subject Scattering en
dc.subject Gamma-ray burst en
dc.subject General en
dc.title Polarization properties of photospheric emission from relativistic, collimated outflows en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Asaf Pe’er, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: a.peer@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Swedish National Space Board
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress a.peer@ucc.ie en

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