The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implications
| dc.creator | Amati, Lorenzo | |
| dc.date | 2006-01-24 | |
| dc.date | 2006-07-20 | |
| dc.date.accessioned | 2026-07-07T10:43:34Z | |
| dc.date.available | 2026-07-07T10:43:34Z | |
| dc.description | The correlation between the cosmological rest-frame nuFnu spectrum peak energy, Ep,i, and the isotropic equivalent radiated energy, Eiso, discovered by Amati et al. in 2002 and confirmed/extended by subsequent osbervations, is one of the most intriguing and debated observational evidences in Gamma-Ray Bursts (GRB) astrophysics. In this paper I provide an update and a re-analysis of the Ep,i - Eiso correlation basing on an updated sample consisting of 41 long GRBs/XRFs with firm estimates of z and observed peak energy, Ep,obs, 12 GRBs with uncertain valeus of z and/or Ep,obs, 2 short GRBs with firm estimates of z and Ep,obs and the peculiar sub-energetic events GRB980425/SN1998bw and GRB031203/SN2003lw. In addition to standard correlation analysis and power-law fitting, the data analysis here reported includes a modelization which accounts for sample variance. All 53 classical long GRBs and XRFs, including 11 Swift events with published spectral parameters and fluences, have Ep,i and Eiso values, or upper/lower limits, consistent with the correlation, which shows a chance probability as low as ~7x10{-15}, a slope of ~0.57 (~0.5 when fitting by accounting for sample variance) and an extra-Poissonian logarithmic dispersion of ~0.15, it extends over ~5 orders of magnitude in Eiso and ~3 orders of magnitude in Ep,i and holds from the closer to the higher z GRBs. I also discuss the main implications of the updated Ep,i - Eiso correlation for the models of the physics and geometry of GRB emission, its use for discriminating different classes and as a pseudo-z estimator, and the tests of possible selection effects with GRBs of unknown redshift. | |
| dc.description | 15 pages, 5 figures, accepted for publication in MNRAS, main journal | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0601553 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0601553 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.372:233-245,2006 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.10840.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/182287 | |
| dc.subject | Astrophysics | |
| dc.title | The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implications | |
| dc.type | text |