Studies of EGRET sources with a novel image restoration technique

Journal Article · Thu Jul 12 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2757299· OSTI ID:21067216

Tajima, Hiroyasu; Cohen-Tanugi, Johann; Kamae, Tuneyoshi ^[1]; Finazzi, Stefano ^[2]; Chiang, James ^[1]

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1. Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)
2. Scuola Normale Superiore, I-56100 Pisa (Italy)

We have developed an image restoration technique based on the Richardson-Lucy algorithm optimized for GLAST-LAT image analysis. Our algorithm is original since it utilizes the PSF (point spread function) that is calculated for each event. This is critical for EGRET and GLAST-LAT image analysis since the PSF depends on the energy and angle of incident gamma-rays and varies by more than one order of magnitude. EGRET and GLAST-LAT image analysis also faces Poisson noise due to low photon statistics. Our technique incorporates wavelet filtering to minimize noise effects. We present studies of EGRET sources using this novel image restoration technique for possible identification of extended gamma-ray sources.

• OSTI ID: 21067216
• Journal Information: AIP Conference Proceedings, Vol. 921, Issue 1; Conference: 1. GLAST symposium, Stanford, CA (United States), 5-8 Feb 2007; Other Information: DOI: 10.1063/1.2757299; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
COSMIC RAY DETECTION
DATA ANALYSIS
GAMMA DETECTION
IMAGE PROCESSING
IMAGES
STATISTICS
TELESCOPE COUNTERS