D' Alessio, V. and Piro, L. (2005) General properties of X-Ray Riches and X-Ray Flashes in comparison with Gamma-Ray Bursts. Il nuovo cimento C, 28 (4\5). pp. 497-500. ISSN 1826-9885
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Abstract
The X-Ray Flashes (XRFs) and X-Ray Riches (XRRs) are two subclasses of Gamma-Ray Bursts (GRBs), which have respectively no detection in the gamma-ray energy and very faint gamma to X-ray fluence. To investigate their nature we compiled a sample of 54 events observed by BeppoSAX and HETE-2, available in literature and from the web. To classify XRRs/XRFs for those two experiments, we adopted the same spectral hardness ratio. We studied their prompt emission in the X and γ range and their spectral parameters and compared them with those of GRBs. We find XRRs/XRFs are characterized by a significantly smaller value of Epeak while the spectral slopes α and β are quite similar. We analysed also the optical and X-ray afterglow fluxes and their ratio and compared them with that obtained for GRBs. We find that the distribution of X-ray flux of XRR/XRF afterglow is consistent with that of GRBs, which is incompatible with the off-axis model. For example, in the inhomogeneous jet model it implies that the observer anglefor an XRR/XRF is at most 2◦. It is also not explained by the high Redshift scenario.
| Item Type: | Article |
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| Additional Information: | Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004. |
| Uncontrolled Keywords: | X-ray ; Visible(390–750 nm) ; γ-ray sources; γ-ray burts |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Mar 2020 16:48 |
| Last Modified: | 16 Mar 2020 16:48 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/15706 |
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