Monte Carlo Simulations of the Photospheric Emission in Gamma-Ray Bursts

Bégué, Damien; Siutsou, I. A.; Vereshchagin, Gregory

doi:10.1088/0004-637x/767/2/139

Cited by 40 publications

(46 citation statements)

References 12 publications

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“…Due to these difficulties, the photospheric emission model is considered as one of the most promising alternative scenarios for the prompt emission mechanism (e.g., Thompson 1994;Eichler & Levinson 2000;Mészáros & Rees 2000;Lazzati et al 2009;Mizuta et al 2011;Nagakura et al 2011;Ruffini et al 2013;Xu et al 2012;Bégué et al 2013;Lundman et al 2013;Lazzati et al 2013). The photospheric emission is an inherent feature of the original fireball model in which the internally trapped photons that accelerate outflow to ultrarelativistic velocity are eventually released at the photosphere (Goodman 1986;Paczynski 1986).…”

Section: Introductionmentioning

confidence: 99%

Spectral and Polarization Properties of Photospheric Emission From Stratified Jets

Ito¹,

Nagataki²,

Matsumoto³

et al. 2014

ApJ

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We explore the spectral and polarization properties of photospheric emissions from stratified jets in which multiple components, separated by sharp velocity shear regions, are distributed in lateral directions. Propagation of thermal photons injected at a high optical depth region are calculated until they escape from the photosphere. It is found that the presence of the lateral structure within the jet leads to the nonthermal feature of the spectra and significant polarization signal in the resulting emission. The deviation from thermal spectra, as well as the polarization degree, tends to be enhanced as the velocity gradient in the shear region increases. In particular, we show that emissions from multicomponent jet can reproduce the typical observed spectra of gamma-ray bursts irrespective of the position of the observer when a velocity shear region is closely spaced in various lateral (θ ) positions. The degree of polarization associated with the emission is significant (>few percent) at a wide range of observer angles and can be higher than 30%.

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Section: Introductionmentioning

confidence: 99%

Spectral and Polarization Properties of Photospheric Emission From Stratified Jets

Ito¹,

Nagataki²,

Matsumoto³

et al. 2014

ApJ

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show abstract

“…11,189,190 However, full treatment of this effect for relativistic outflows, as occur in GRB, was carried out only recently. 5,185,[191][192][193][194][195] When considering spherical, relativistic explosion characterized by Γ ≫ 1, one can show that the photospheric radius is a strong function of the angle to the line of sight:…”

Section: Geometrical Broadeningmentioning

confidence: 99%

Photospheric emission in gamma-ray bursts

Pe’er

Ryde

2017

Int. J. Mod. Phys. D

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A major breakthrough in our understanding of gamma-ray bursts (GRB) prompt emission physics occurred in the last few years, with the realization that a thermal component accompanies the over-all non-thermal prompt spectra. This thermal part is important by itself, as it provides direct probe of the physics in the innermost outflow regions. It further has an indirect importance, as a source of seed photons for inverse-Compton scattering, thereby it contributs to the non-thermal part as well. In this short review, we highlight some key recent developments. Observationally, although so far it was clearly identified only in a minority of bursts, there are indirect evidence that thermal component exists in a very large fraction of GRBs, possibly close to 100%. Theoretically, the existence of thermal component have a large number of implications as a probe of underlying GRB physics. Some surprising implications include its use as a probe of the jet dynamics, geometry and magnetization.

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“…11,191,192 However, full treatment of this effect for relativistic outflows, as occur in GRB, was carried out only recently. 5,187,[193][194][195][196][197] Comptonization of nonisotropic distributed photons near the photosphere leads to substantial deviation from the "Planck" spectrum. 198,199 When considering spherical, relativistic explosion characterized by Γ 1, one can show that the photospheric radius is a strong function of the angle to the line of sight:…”

Section: Geometrical Broadeningmentioning

confidence: 99%

Photospheric emission in gamma-ray bursts

Pe’er

Ryde

2017

The Fourteenth Marcel Grossmann Meeting

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A major breakthrough in our understanding of gamma-ray bursts (GRB) prompt emission physics occurred in the last few years, with the realization that a thermal component accompanies the over-all nonthermal prompt spectra. This thermal part is important by itself, as it provides direct probe of the physics in the innermost outflow regions. It further has an indirect importance, as a source of seed photons for inverse-Compton scattering, thereby it contributes to the nonthermal part as well. In this short review, we highlight some key recent developments. Observationally, although so far it was clearly identified only in a minority of bursts, there is indirect evidence that a thermal component exists in a very large fraction of GRBs, possibly close to 100%. Theoretically, the existence of a thermal component has a large number of implications as a probe of underlying GRB physics. Some surprising implications include its use as a probe of the jet dynamics, geometry and magnetization.

show abstract

Monte Carlo Simulations of the Photospheric Emission in Gamma-Ray Bursts

Cited by 40 publications

References 12 publications

Spectral and Polarization Properties of Photospheric Emission From Stratified Jets

Spectral and Polarization Properties of Photospheric Emission From Stratified Jets

Photospheric emission in gamma-ray bursts

Photospheric emission in gamma-ray bursts

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