中国物理B ›› 2006, Vol. 15 ›› Issue (7): 1645-1652.doi: 10.1088/1009-1963/15/7/044
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覃一平1, 张富文1, 陆睿静1, 张彬彬2, 董云明2, 李怀珍2, 贾兰伟2, 毛李胜2, 崔晓红2, 张志彬2, 易庭丰3
Qin Yi-Ping (覃一平)ab, Zhang Bin-Bin (张彬彬)ac, Dong Yun-Ming (董云明)ac, Zhang Fu-Wen (张富文)abc, Li Huai-Zhen (李怀珍)ac, Jia Lan-Wei (贾兰伟)ac, Mao Li-Sheng (毛李胜)ac, Lu Rui-Jing (陆睿静)abc, Yi Ting-Feng (易庭丰)b, Cui Xiao-Hong (崔晓红)ac, Zhang Zhi-Bin (张志彬)ac
摘要: In this paper, the effect of the intrinsic distribution of cosmological candles is investigated. We find that in the case of a narrow distribution the deviation of the observed modulus of sources from the expected central value can be estimated within a ceratin range. We thus introduce lower and upper limits of X2, X min2 and Xmax2 to estimate cosmological parameters by applying the conventional minimizing X2 method. We apply this method to a gamma-ray burst (GRB) sample as well as to a combined sample including this GRB sample and an SN Ia sample. Our analysis shows that: a) in the case of assuming an intrinsic distribution of candles of the GRB sample, the effect of the distribution is obvious and should not be neglected; b) taking into account this effect would lead to a poorer constraint of the cosmological parameter ranges. The analysis suggests that in the attempt of constraining the cosmological model with current GRB samples, the results tend to be worse than was previously anticipated if the mentioned intrinsic distribution does exist.
中图分类号: (Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))