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Extremely narrow sp...
Extremely narrow spectrum of GRB110920A : further evidence for localised, subphotospheric dissipation
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- Iyyani, Shabnam, 1988- (author)
- KTH,Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),KTH Royal Institute of Technology, Sweden; Erasmus Mundus Joint Doctorate in Relativistic Astrophysics,Partikel- och astropartikelfysik
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- Ryde, Felix (author)
- KTH,Partikel- och astropartikelfysik
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- Ahlgren, Björn (author)
- KTH,Partikel- och astropartikelfysik
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Burgess, J. Michael (author)
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Larsson, Josefin (author)
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Pe'er, A. (author)
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- Lundman, Christopher (author)
- KTH,Partikel- och astropartikelfysik
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- Axelsson, Magnus (author)
- Stockholms universitet,Fysikum,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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McGlynn, S. (author)
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(creator_code:org_t)
- 2015-04-28
- 2015
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 450:2, s. 1651-1663
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https://su.diva-port... (primary) (Raw object)
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Much evidence points towards that the photosphere in the relativistic outflow in GRBs plays an important role in shaping the observed MeV spectrum. However, it is unclear whether the spectrum is fully produced by the photosphere or whether a substantial part of the spectrum is added by processes far above the photosphere. Here we make a detailed study of the $\gamma$−ray emission from single pulse GRB110920A which has a spectrum that becomes extremely narrow towards the end of the burst. We show that the emission can be interpreted as Comptonisation of thermal photons by cold electrons in an unmagnetised outflow at an optical depth of $\tau \sim 20$. The electrons receive their energy by a local dissipation occurring close to the saturation radius. The main spectral component of GRB110920A and its evolution is thus, in this interpretation, fully explained by the emission from the photosphere including localised dissipation at high optical depths.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- radiation mechanisms: non-thermal
- radiation mechanisms: thermal
- gamma-ray burst: general
- Theoretical Physics
- teoretisk fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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Iyyani, Shabnam, ...
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Ryde, Felix
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Ahlgren, Björn
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Burgess, J. Mich ...
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Larsson, Josefin
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Pe'er, A.
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Lundman, Christo ...
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Axelsson, Magnus
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McGlynn, S.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Stockholm University
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Royal Institute of Technology