GRB physics and cosmology with peak energy-intensity correlations

Date Issued
2015
Author(s)
Sawant, Disha
•
DOI
Abstract
Gamma Ray Bursts (GRBs) are immensely energetic explosions radiating up to 10^54 erg of energy isotropically (Eiso) and they are observed within a wide range of redshift (from ̃ 0.01 up to ̃ 9). Such enormous power and high redshift point at these phenomena being highly favorable to investigate the history and evolution of our universe. The major obstacle in their application as cosmological study-tools is to find a way to standardize the GRBs, for instance similar to SNe Ia. With respect to this goal, the correlation between spectral peak energy (Ep,i) and the "intensity" is a positively useful and investigated criterion. Moreover, it has been demonstrated that, through the Ep,i - Eiso correlation, the current data set of GRBs can already contribute to the independent evidence of the matter density Ω_M being ̃ 0.3 for a flat universe scenario. We try to inspect and compare the correlations of Ep,i with different intensity indicators (e.g., radiated energy, average and peak luminosity, bolometric vs. monochromatic quantities, etc.) both in terms of intrinsic dispersion and precise estimation of Ω_M. The outcome of such studies are further analyzed in verifying the reliability of the correlations for both GRB physics and their standardization for cosmology.
Coverage
The Second ICRANet César Lattes Meeting: Supernovae, Neutron Stars and Black Holes
All editors
Barres de Almeida, Ulisses; Chardonnet, Pascal; Picanco Negreiros, Rodrigo; Rueda, Jorge; Ruffini, Remo; Vereshchagin, Gregory; Zen Vasconcellos, César
Series
Volume
1693
Start page
020004
Conferenece
The Second ICRANet César Lattes Meeting: Supernovae, Neutron Stars and Black Holes
Conferenece place
Rio de Janeiro, Niterói, João Pessoa, Recife and Fortaleza, Brazil
Conferenece date
13-22 April, 2015
Uri
Url
Issn Identifier
0094-243X
Ads BibCode
2015AIPC.1693b0004S
Rights
open.access
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