PROBABILISTIC CROSS-IDENTIFICATION OF COSMIC EVENTS

被引：8

作者：

Budavari, Tumas ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 736卷 / 02期

关键词：

methods: data analysis; methods: statistical; supernovae: general; surveys; time;

D O I：

10.1088/0004-637X/736/2/155

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

I discuss a novel approach to identifying cosmic events in separate and independent observations. The focus is on the true events, such as supernova explosions, that happen once and, hence, whose measurements are not repeatable. Their classification and analysis must make the best use of all available data. Bayesian hypothesis testing is used to associate streams of events in space and time. Probabilities are assigned to the matches by studying their rates of occurrence. A case study of Type Ia supernovae illustrates how to use light curves in the cross-identification process. Constraints from realistic light curves happen to be well approximated by Gaussians in time, which makes the matching process very efficient. Model-dependent associations are computationally more demanding but can further boost one's confidence.

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