Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065..361g&link_type=abstract
2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 361-366 (2008).
Physics
Gamma-Ray Sources, Gamma-Ray Bursts, Exchange, Correlation, Dielectric And Magnetic Response Functions, Plasmons, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
The spectral-energy correlations (Epeak-Eiso and Epeak-Liso) holding for the population of long GRBs have been recently discussed. The question is if they have a physical origin or they are due to instrumental selection effects. By considering GRBs with and without redshifts it is possible to study the instrumental selection effects in the observer frame Epeakobs-Fluence and Epeakobs-Peak Flux plane, where strong correlations are found. The results suggests that while both the trigger threshold and the spectral analysis thresholds do not bias the sample of GRBs used to define the Epeak-Eiso and Epeak-Liso correlations in the pre-Swift era, a strong bias is present in the Swift sample. If selection effects are difficult to model, a conclusive proof of the physical origin of the spectra-energy correlations comes from the time resolved spectral analysis. By considering BATSE GRBs with known redshifts, it is shown that a correlation similar to the Epeak-Liso one (defined with the time integrated spectral properties) also holds within single bursts. This result concludes the discussion about selection effects and opens the path to the physical interpretations of these correlations. Finally we show the updated Epeak-Eγ correlation.
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