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http://hdl.handle.net/20.500.12386/27190
Titolo: | Possible physical explanation of the intrinsic Ep,i-“intensity” correlation commonly used to “standardize” GRBs | Autori: | Frontera, Filippo AMATI, LORENZO FARINELLI, Ruben Dichiara, Simone GUIDORZI, CRISTIANO LANDI, RAFFAELLA Titarchuk, Lev |
Data pubblicazione: | 2016 | Rivista: | INTERNATIONAL JOURNAL OF MODERN PHYSICS D | Numero: | 25 | Fascicolo: | 5 | Da pagina:: | 1630014 | Abstract: | 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 [L. Titarchuk, R. Farinelli, F. Frontera and L. Amati, Astrophys. J. 752 (2012) 116]. 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 2keV to 2MeV [F. Frontera, L. Amati, R. Farinelli, S. Dichiara, C. Guidorzi, R. Landi and L. Titarchuk, Astrophys. J. 779 (2013) 175]. | URI: | http://hdl.handle.net/20.500.12386/27190 | URL: | https://www.worldscientific.com/doi/pdf/10.1142/S0218271816300147 | ISSN: | 0218-2718 | DOI: | 10.1142/S0218271816300147 | Bibcode ADS: | 2016IJMPD..2530014F | Fulltext: | open |
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