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Time-varying Polarized Gamma-Rays from GRB 160821A : Evidence for Ordered Magnetic Fields
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- Sharma, Vidushi (author)
- Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
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- Iyyani, Shabnam (author)
- Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
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- Bhattacharya, Dipankar (author)
- Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
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- Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India Stanford Univ, Dept Phys, 382 Via Pueblo Mall, Stanford, CA 94305 USA.;Kavli Inst Astrophys & Cosmol, 452 Lomita Mall, Stanford, CA 9430 USA. (creator_code:org_t)
- 2019-09-03
- 2019
- English.
- In: Astrophysical Journal Letters. - : IOP PUBLISHING LTD. - 2041-8205 .- 2041-8213. ; 882:1
- Journal article (peer-reviewed)
Abstract
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- GRB 160821A is the third most energetic gamma-ray burst observed by the Fermi gamma-ray space telescope. Based on the observations made by the Cadmium Zinc Telluride Imager on board AstroSat, here we report the most conclusive evidence to date of (i) high linear polarization (66(27)(+26)%; 5.3 sigma detection), and (ii) variation of polarization angle with time, occurring twice during the rise and decay phase of the burst at 3.5 sigma and 3.1 sigma detections, respectively. All confidence levels are reported for two parameters of interest. These observations strongly suggest synchrotron radiation produced in magnetic field lines that are highly ordered on angular scales of 1/Gamma, where Gamma is the Lorentz factor of the outflow.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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