Detection of spatially extended sources in high energy astrophysics with special application to lunar occultation

Details Detection of spatially extended sources in high energy astrophysics with special application to lunar occultation Detection of spatially extended sources in high energy astrophysics with special application to lunar occultation

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt.........1j&link_type=abstract

Proquest Dissertations And Theses 2009. Section 0278, Part 0606 155 pages; [Ph.D. dissertation].United States -- Alabama: The U

Astronomy and Astrophysics

Astrophysics

1

Extended Sources, Lunar Occultation, Gamma-Ray, Galactic Emission, Markov-Chain Monte Carlo

Scientific paper

Occultation is a technique that enables image reconstruction and source identification with a non-imaging detector. Such an approach is well suited for a future survey mission in nuclear astrophysics. In particular, the Lunar Occultation Technique (LOT) utilizes the Moon as an occulting object and is the basis of a new gamma-ray survey mission concept, the Lunar OCcultation Observer (LOCO). Techniques utilizing the LOT to detect spatially extended emission, from the Galactic plane or Galactic Center region, have been developed. Given knowledge of detector position in lunar orbit, combined with lunar ephemeris and relevant coordinate transformations, occultation time series can be used to reconstruct skymaps of these extended Galactic emitters. Monte-Carlo Markov Chains (MCMC), incorporating the Metropolis-Hastings algorithm for parametric model testing, form the basis of the technique. Performance of the imaging methodology, and its application to nuclear astrophysics will be presented.

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