Polarization of GRB via scattering off a relativistic sheath

Details Polarization of GRB via scattering off a relativistic sheath Polarization of GRB via scattering off a relativistic sheath

2003-06-18

arxiv.org/abs/astro-ph/0306360v2

Astrophys.J.596:L147-L150,2003

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, improved discussion, to appear in ApJL

Scientific paper

10.1086/379313

GRB fireballs could be ensheathed by a relativistic, baryon-enriched outflow that would in selected directions scatter a polarized beam of gamma rays. The strong polarization recently announced by RHESSI is attainable by the scattering mechanism, though not most of the time. The scattering mechanism, when acting in addition to the synchrotron mechanism, could circumvent some of the predictions implied by a purely synchrotron origin for the polarization. The time profile of the scattered component could differ from that of the primary gamma rays.

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