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25 April 2024 |
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The Swift satellite and redshifts of long gamma-ray bursts | | Z. Bagoly
; A. Mészáros
; L.G. Balázs
; I. Horváth
; S. Klose
; S. Larsson
; P. Mészáros
; F. Ryde
; G. Tusnády
; | | Date: |
14 Apr 2006 | | Abstract: | Until 6 October 2005 sixteen redshifts have been measured of long gamma-ray bursts discovered by the Swift satellite. Further 45 redshifts have been measured of the long gamma-ray bursts discovered by other satellites. Here we perform five statistical tests comparing the redshift distributions of these two samples assuming - as the null hypothesis - identical distribution for the two samples. Three tests (Student’s $t$-test, Mann-Whitney test, Kolmogorov-Smirnov test) reject the null hypothesis on the significance levels between 97.19 and 98.55%. Two different comparisons of the medians show extreme $(99.78-99.99994)$% significance levels of rejection. This means that the redshifts of the Swift sample and the redshifts of the non-Swift sample are distributed differently - in the Swift sample the redshifts are on average larger. This statistical result suggests that the long GRBs should on average be at the higher redshifts of the Swift sample. | | Source: | arXiv, astro-ph/0604326 | | Services: | Forum | Review | PDF | Favorites | |
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