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Testing the E_p,i - L_p,iso - T_0.45 correlation on a BeppoSAX and Swift sample of gamma-ray bursts | | F. Rossi
; C. Guidorzi
; L. Amati
; F. Frontera
; P. Romano
; S. Campana
; G. Chincarini
; E. Montanari
; A. Moretti
; G. Tagliaferri
; | | Date: |
4 Feb 2008 | | Abstract: | Using a sample of 14 BeppoSAX and 53 Swift GRBs with measured redshift we
tested the correlation between the intrinsic peak energy of the time-integrated
spectrum, E_p,i, the isotropic-equivalent peak luminosity, L_p,iso, and the
duration of the most intense parts of the GRB computed as T_0.45 ("Firmani
correlation"). For 32 out of 67 GRBs we could estimate all of the three
required properties. Apart from 980425, which appears to be a definite outlier
and notoriously peculiar in many respects, we used 31 GRBs to fit the
correlation with the D’Agostini method, suitable to account for the extrinsic
scatter in addition to the intrinsic uncertainties affecting the single GRBs.
We confirm the correlation. However, unlike the results by Firmani et al., we
found that the correlation does have a logarithmic scatter comparable with that
of the E_p,i - E_iso ("Amati") correlation. We also find that the slope of the
product L_p,iso T_0.45 is equal to ~0.5, which is consistent with the
hypothesis that the E_p,i - L_p,iso - T_0.45 correlation is equivalent to the
E_p,i - E_iso correlation (slope ~0.5). We conclude that, based on presently
available data, there is no clear evidence that the E_p,i - L_p,iso - T_0.45
correlation is different (both in terms of slope and dispersion) from the E_p,i
- E_iso correlation. | | Source: | arXiv, 0802.0471 | | Services: | Forum | Review | PDF | Favorites | |
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