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http://hdl.handle.net/20.500.12386/23960
Titolo: | A Common Stochastic Process Rules Gamma-ray Burst Prompt Emission and X-ray Flares | Autori: | Guidorzi, C. Dichiara, S. Frontera, F. Margutti, R. Baldeschi, A. AMATI, LORENZO |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 801 | Fascicolo: | 1 | Da pagina:: | 57 | Abstract: | Prompt γ-ray and early X-ray afterglow emissions in gamma-ray bursts (GRBs) are characterized by a bursty behavior and are often interspersed with long quiescent times. There is compelling evidence that X-ray flares are linked to prompt γ-rays. However, the physical mechanism that leads to the complex temporal distribution of γ-ray pulses and X-ray flares is not understood. Here we show that the waiting time distribution (WTD) of pulses and flares exhibits a power-law tail extending over four decades with an index of about two and can be the manifestation of a common time-dependent Poisson process. This result is robust and is obtained on different catalogs. Surprisingly, GRBs with many (≥slant 8) γ-ray pulses are very unlikely to be accompanied by X-ray flares after the end of the prompt emission (3.1σ Gaussian confidence). These results are consistent with a simple interpretation: a hyperaccreting disk breaks up into one or a few groups of fragments, each of which is independently accreted with the same probability per unit time. Prompt γ-rays and late X-ray flares are nothing but different fragments being accreted at the beginning and at the end, respectively, following the very same stochastic process and likely the same mechanism. | Acknowledgments: | We are grateful to the anonymous referee for a constructive and insightful review. The PRIN MIUR project on “Gamma-ray bursts: From progenitors to physics of the prompt emission process,” P.I. F. Frontera (Prot. 2009 ERC3HT), is acknowledged. | URI: | http://hdl.handle.net/20.500.12386/23960 | URL: | https://iopscience.iop.org/article/10.1088/0004-637X/801/1/57 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/801/1/57 | Bibcode ADS: | 2015ApJ...801...57G | Fulltext: | open |
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