Investigating γ- and X-ray properties of GRBs using multivariate statistics |
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Authors: | Lajos G Balázs Péter Veres |
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Institution: | 1. Konkoly Observatory, H-1525 Budapest, P.O. Box 67, Hungary;2. Department of Physics of Complex Systems, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary;3. Department of Physics, Bolyai Military University, P.O. Box 15, H-1581 Budapest, Hungary |
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Abstract: | We propose to study the interrelation between the γ- (Fluence, 1sec Peakflux, duration) and X-ray (early X flux, 24 h X flux, X decay index, X spectral index, X HI column density) properties using the canonical correlation method. Computing the canonical correlations and variables we show that there is a significant interrelation between the γ- and X-ray data. Using the canonical variables from the analysis, we computed their correlations (canonical loadings) with the original ones. The canonical loadings revealed that the γ-ray fluence and the early X-ray flux give the strongest contribution to the correlation in contrast to the X-ray decay index and spectral index. An interesting new result appears to be the strong contribution of the HI column density to the correlation. Accepting the collapsar model of long GRBs this effect may be interpreted as an indication for the ejection of an HI envelope by the progenitor in the course of producing the GRB. |
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Keywords: | γ-ray sources γ-ray bursts Statistical methods |
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