Circular Polarization from Gamma-Ray Burst Afterglows | Zendy

Makoto Matsumiya | Zendy; Kunihito Ioka | Zendy

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Circular Polarization from Gamma-Ray Burst Afterglows

Author(s) -

Makoto Matsumiya,

Kunihito Ioka

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/378879

Subject(s) - gamma ray burst , physics , polarization (electrochemistry) , magnetic field , astrophysics , circular polarization , shock (circulatory) , radiation , optics , quantum mechanics , chemistry , medicine

We investigate the circular polarization (CP) from Gamma-Ray Burst (GRB)afterglows. We show that a tangled magnetic field cannot generate CP without anordered magnetic field because there is always an oppositely directed field, sothat no handedness exists. This implies the observation of CP could be a usefulprobe of an ordered field, which carries valuable information on the GRBcentral engine. By solving the transfer equation of polarized radiation, wefind that the CP reaches 1% at radio frequencies and 0.01% at optical for theforward shock, and 10-1% at radio and 0.1-0.01% at optical for the reverseshock.Comment: 12 pages, 3 figure

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