Perspective GRB cosmology with time resolved E$_{p,i}$(t)−L$_{iso}$(t) correlation
Résumé
Gamma Ray Bursts are complicated phenomena in terms their physical origins, and several models have been proposed to depict the processes responsible for their emerging. Physical models are challenged by the spectral behavior of the prompt emission and the correlation between spectral peak energy and “intensity” (e.g., radiated energy, luminosity), which is also the most investigated “tool” to standardize GRBs in order to use them for cosmology. To understand the actual physical properties, selection effects and instrumental biases of such correlation, we have analyzed the Fermi/GBM spectra of GRBs with measured redshift as of end of 2014, resolving them in short time intervals. We provide short summary of the results, which confirms the robustness of the peak energy – intensity correlation in GRBs and put forward the time–resolved analysis as a potentially powerful tool for using GRBs to measure cosmological parameters.