JSM Preliminary Online Program
This is the preliminary program for the 2007 Joint Statistical Meetings in Salt Lake City, Utah.

The views expressed here are those of the individual authors
and not necessarily those of the ASA or its board, officers, or staff.

Back to main JSM 2007 Program page

Activity Number: 411
Type: Topic Contributed
Date/Time: Wednesday, August 1, 2007 : 10:30 AM to 12:20 PM
Sponsor: Section on Bayesian Statistical Science
Abstract - #308841
Title: Fully Bayesian Analysis of Low-Count Astronomical Images
Author(s): David van Dyk*+ and Alanna Connors
Companies: University of California, Irvine and Eurika Scientific
Address: 2206 Bren Hall, Irvine, CA, 92697-1250,
Keywords: Astrostatistics ; Multi-Scale Methods ; Image Analysis ; MCMC in Practice ; Bayesian Methods ; Poisson Models

New space-based telescopes that are designed to map X-ray and gamma-ray emission are giving a completely new perspective on the hot and turbulent regions of the universe. Analysis of the resulting images is a sophisticated task that requires subtle statistical techniques. Data is collected as photon counts on a grid of detector pixels. The counts are subject to non-uniform stochastic censoring, heteroscedastic errors in measurement, and background contamination. This combined with relatively small datasets makes answering complex astronomical questions a challenge. In this talk I describe how we (1) use Markov-random-field or multi-scale priors to stabilize the fitted images; (2) use posterior simulation to quantify uncertainty; (3) use higher resolution radio data to inform our priors; and (4) use Bayesian methods to test for deviations from particular structures in the image.

  • The address information is for the authors that have a + after their name.
  • Authors who are presenting talks have a * after their name.

Back to the full JSM 2007 program

JSM 2007 For information, contact jsm@amstat.org or phone (888) 231-3473. If you have questions about the Continuing Education program, please contact the Education Department.
Revised September, 2007