报告题目：The Swift GRB redshift distribution: selection effects or luminosity evolution

　　报 告 人：Prof. David Coward （University of Western Australia）

　　报告摘要：We employ realistic constraints on selection effects to model the Gamma-Ray Burst (GRB) redshift distribution using Swift triggered redshift samples acquired from optical afterglows. Models for the Malmquist bias, redshift desert, and the fraction of afterglows missing because of host galaxy dust extinction, are used to show how the “true” GRB redshift distribution is distorted to its presently observed biased distribution. Our analysis, which accounts for the missing fraction of redshifts in the two data subsets, shows that a combination of selection effects (both instrumental and astrophysical) can describe the observed GRB redshift distribution. The observed distribution supports the case for dust extinction as the dominant astrophysical selection effect that shapes the redshift distribution.

　　报告地点：苏福特大厦1楼会议室

　　报告时间：2013年9月10日（星期二）下午16:00

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　　                                                  南京大学天文与空间科学学院