TY - GEN
T1 - Possible physical explanation of the intrinsic Ep,i -“intensity” correlation commonly used to “standardize” GRBs
AU - Frontera, Filippo
AU - Amati, Lorenzo
AU - Farinelli, Ruben
AU - Dichiara, Simone
AU - Guidorzi, Cristiano
AU - Landi, Raffaella
AU - Titarchuk, Lev
N1 - Publisher Copyright:
Copyright © 2018 by the Editors.All rights reserved.
PY - 2018
Y1 - 2018
N2 - It is recognized that very likely the correlation between peak energy Ep and bolometric intensity is intrinsic to GRBs. However its physical origin is still debated. In this paper we will discuss a possible interpretation of the correlation in the light of a GRB prompt emission spectral model, grbcomp, proposed in Ref. 1. grbcomp is essentially a photospheric model for the prompt emission of GRBs. Its main ingredients are a thermal bath of soft seed photons and a subrelativistically expanding outflow plasma, consequence of the star explosion. The emerging spectrum is the result of two phases: first, up to the photospheric radius, Comptonization of a subrelativistic electron outflow with thermal bath of soft photons, then, convolution of the Comptonized photons in the first phase with a Green function. The result of this convolution is consistent with different physical processes, in particular Inverse Compton. grbcomp has been successfully tested using a significant sample of GRB time resolved spectra in the broad energy band from 2 keV to 2 MeV.2
AB - It is recognized that very likely the correlation between peak energy Ep and bolometric intensity is intrinsic to GRBs. However its physical origin is still debated. In this paper we will discuss a possible interpretation of the correlation in the light of a GRB prompt emission spectral model, grbcomp, proposed in Ref. 1. grbcomp is essentially a photospheric model for the prompt emission of GRBs. Its main ingredients are a thermal bath of soft seed photons and a subrelativistically expanding outflow plasma, consequence of the star explosion. The emerging spectrum is the result of two phases: first, up to the photospheric radius, Comptonization of a subrelativistic electron outflow with thermal bath of soft photons, then, convolution of the Comptonized photons in the first phase with a Green function. The result of this convolution is consistent with different physical processes, in particular Inverse Compton. grbcomp has been successfully tested using a significant sample of GRB time resolved spectra in the broad energy band from 2 keV to 2 MeV.2
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U2 - 10.1142/9789813226609_0043
DO - 10.1142/9789813226609_0043
M3 - Conference contribution
AN - SCOPUS:85059078297
T3 - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
SP - 797
EP - 805
BT - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
A2 - Bianchi, Massimo
A2 - Jantzen, Robert T
A2 - Ruffini, Remo
A2 - Ruffini, Remo
PB - World Scientific Publishing Co. Pte Ltd
T2 - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
Y2 - 12 July 2015 through 18 July 2015
ER -