This thesis is mainly focused on careful data analysis of different parts of high-energy (sub-keV--GeV) spectra of gamma-ray bursts. All the interpretation works are based on the theoretical ground of the fireshell paradigm which is being continuously developed for over 20 years. The chapters in the main body of the thesis focus on current research and results obtained and published. A distinct emphasis on spectral bands is expressed through structural division of the thesis: soft gamma-ray emission, x-ray afterglow emission and high-energy gamma-ray emission. In Chapter 2 we discuss theoretical and observational evidences which have been recently gained for a two-fold classification of short bursts within the fireshell working paradigm. We present three additional S-GRBs, 081024B, 090510 and 140402A, following the already identified S-GRBs, i.e., 090227B and 140619B. In Chapter 3 we analyze the early X-ray flares in the GRB "flare-plateau-afterglow" (FPA) phase observed by Swift-XRT. We claim that the FPA occurs only in one of the subclasses---binary-driven hypernovae (BdHNe). This subclass consists of long GRBs with a carbon-oxygen core (CO_core) massive star and a neutron star (NS) binary companion as progenitors. In Chapter 4 we examine a scenario when in binary system of neutron star (NS) and massive CO_core star, the latter undergoes a supernova (SN) explosion. A black hole (BH) subsequently originates from the gravitational collapse of the NS caused by hypercritical accretion of the SN ejecta. We infer a new asymmetric morphology for the BdHNe system where the GeV emission occurs within a cone of half-opening angle approximately 60 degrees normal to the orbital plane of the binary progenitor. We confirm that GeV luminosity light curves follow the universal power-law with index of -1.19 +/- 0.04, and from this we further estimate the spin-down rate of the BH.

Gamma-ray bursts within fireshell model / Aimuratov, Yerlan. - (2020 Feb 25).

Gamma-ray bursts within fireshell model

AIMURATOV, YERLAN
25/02/2020

Abstract

This thesis is mainly focused on careful data analysis of different parts of high-energy (sub-keV--GeV) spectra of gamma-ray bursts. All the interpretation works are based on the theoretical ground of the fireshell paradigm which is being continuously developed for over 20 years. The chapters in the main body of the thesis focus on current research and results obtained and published. A distinct emphasis on spectral bands is expressed through structural division of the thesis: soft gamma-ray emission, x-ray afterglow emission and high-energy gamma-ray emission. In Chapter 2 we discuss theoretical and observational evidences which have been recently gained for a two-fold classification of short bursts within the fireshell working paradigm. We present three additional S-GRBs, 081024B, 090510 and 140402A, following the already identified S-GRBs, i.e., 090227B and 140619B. In Chapter 3 we analyze the early X-ray flares in the GRB "flare-plateau-afterglow" (FPA) phase observed by Swift-XRT. We claim that the FPA occurs only in one of the subclasses---binary-driven hypernovae (BdHNe). This subclass consists of long GRBs with a carbon-oxygen core (CO_core) massive star and a neutron star (NS) binary companion as progenitors. In Chapter 4 we examine a scenario when in binary system of neutron star (NS) and massive CO_core star, the latter undergoes a supernova (SN) explosion. A black hole (BH) subsequently originates from the gravitational collapse of the NS caused by hypercritical accretion of the SN ejecta. We infer a new asymmetric morphology for the BdHNe system where the GeV emission occurs within a cone of half-opening angle approximately 60 degrees normal to the orbital plane of the binary progenitor. We confirm that GeV luminosity light curves follow the universal power-law with index of -1.19 +/- 0.04, and from this we further estimate the spin-down rate of the BH.
25-feb-2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1365843
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