DISCOVERY OF A TIGHT CORRELATION FOR GAMMA-RAY BURST AFTERGLOWS WITH 'CANONICAL' LIGHT CURVES
- Obserwatorium Astronomiczne, Uniwersytet Jagiellonski, ul. Orla 171, 31-501 Krakow (Poland)
- Department of Physics and Astronomy, University of Leicester, Road Leicester LE1 7RH (United Kingdom)
- Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Complesso Universitario di Monte Sant'Angelo, Edificio N, via Cinthia, 80126 Napoli (Italy)
Gamma-ray bursts (GRBs) observed up to redshifts z>8 are fascinating objects to study due to their still unexplained relativistic outburst mechanisms and their possible use to test cosmological models. Our analysis of 77 GRB afterglows with known redshifts revealed a physical subsample of long GRBs with the canonical plateau breaking to power-law light curves with a significant luminosity L*{sub X}-break time T*{sub a} correlation in the GRB rest frame. This subsample forms approximately the upper envelope of the studied distribution. We have also found a similar relation for a small sample of GRB afterglows that belong to the intermediate class between the short and the long ones. It proves that within the full sample of afterglows there exist physical subclasses revealed here by tight correlations of their afterglow properties. The afterglows with regular ('canonical') light curves obey not only the mentioned tight physical scaling, but-for a given T*{sub a}-the more regular progenitor explosions lead to preferentially brighter afterglows.
- OSTI ID:
- 21452730
- Journal Information:
- Astrophysical Journal Letters, Vol. 722, Issue 2; Other Information: DOI: 10.1088/2041-8205/722/2/L215; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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