Method of determining cosmological parameter ranges with samples of candles with an intrinsic distribution
Method of determining cosmological parameter ranges with samples of candles with an intrinsic distribution作者机构：National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Physics Department Guangxi University Nanning Guangxi 530004 China The Graduate School of the Chinese Academy of Sciences Beijing 100049 China
出 版 物：《Chinese Physics B》 (中国物理B（英文版）)
年 卷 期：2006年第15卷第7期
页 面：1645-1652页
核心收录：
学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学]
主 题：cosmological parameters observational cosmology distance scale
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 X^2, X^2min and X^2max to estimate cosmological parameters by applying the conventional minimizing X^2 method. We apply this method to a gammaray 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.
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