A Bayesian hierarchical model for photometric red shifts

Merrilee Hurn, P J Green, F Al Awadhi

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Abstract

The Sloan digital sky survey is an extremely large astronomical survey that is conducted with the intention of mapping more than a quarter of the sky. Among the data that it is generating are spectroscopic and photometric measurements, both containing information about the red shift of galaxies. The former are precise and easy to interpret but expensive to gather; the latter are far cheaper but correspondingly more difficult to interpret. Recently, Csabai and co-workers have described various calibration techniques aiming to predict red shift from photometric measurements. We investigate what a structured Bayesian approach to the problem can add. In particular, we are interested in providing uncertainty bounds that are associated with the underlying red shifts and the classifications of the galaxies. We find that quite a generic statistical modelling approach, using for the most part standard model ingredients, can compete with much more specific custom-made and highly tuned techniques that are already available in the astronomical literature.
LanguageEnglish
Pages487-504
Number of pages18
JournalJournal of the Royal Statistical Society Series C-Applied Statistics
Volume57
Issue number4
Early online date27 May 2008
DOIs
StatusPublished - Sep 2008

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Bayesian Hierarchical Model
Galaxies
Statistical Modeling
Bayesian Approach
Standard Model
Calibration
Uncertainty
Predict
Bayesian hierarchical model
Workers
Bayesian approach
Modeling

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A Bayesian hierarchical model for photometric red shifts. / Hurn, Merrilee; Green, P J; Awadhi, F Al.

In: Journal of the Royal Statistical Society Series C-Applied Statistics, Vol. 57, No. 4, 09.2008, p. 487-504.

Research output: Contribution to journalArticle

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