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TRANSPARENCY PARAMETERS FROM RELATIVISTICALLY EXPANDING OUTFLOWS

Begue, D. (author)
Iyyani, Shabnam (author)
KTH,Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),KTH Royal Institute of Technology, Sweden,Fysik,Stockholm University, Sweden
 (creator_code:org_t)
2014
2014
English.
In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 792:1
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • In many gamma-ray bursts a distinct blackbody spectral component is present, which is attributed to the emission from the photosphere of a relativistically expanding plasma. The properties of this component (temperature and flux) can be linked to the properties of the outflow and have been presented in the case where there is no sub-photospheric dissipation and the photosphere is in coasting phase. First, we present the derivation of the properties of the outflow for finite winds, including when the photosphere is in the accelerating phase. Second, we study the effect of localized sub-photospheric dissipation on the estimation of the parameters. Finally, we apply our results to GRB 090902B. We find that during the first epoch of this burst the photosphere is most likely to be in the accelerating phase, leading to smaller values of the Lorentz factor than the ones previously estimated. For the second epoch, we find that the photosphere is likely to be in the coasting phase.

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

gamma-ray burst: general
plasmas
radiation mechanisms: thermal
Theoretical Physics
teoretisk fysik

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Begue, D.
Iyyani, Shabnam
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NATURAL SCIENCES
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and Astronomy Astrop ...
NATURAL SCIENCES
NATURAL SCIENCES
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Stockholm University
Royal Institute of Technology

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