Al-26 imaging details from COMPTEL

Details Al-26 imaging details from COMPTEL Al-26 imaging details from COMPTEL

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15r.123d&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)123-(5)126

Astronomy and Astrophysics

Astronomy

5

Aluminum 26, Emission Spectra, Gamma Ray Astronomy, Image Analysis, Image Processing, Likelihood Ratio, Maximum Entropy Method, Maximum Likelihood Estimates, Point Sources, Astronomical Maps, Astronomical Models, Computerized Simulation, Galactic Bulge, Galactic Structure, Gamma Ray Observatory, Supernova Remnants

Scientific paper

The Compton Telescope (COMPTEL) map of 1.809 MeV emission from Galactic Al-26 is now based on 2 1/2 years of data. Different imaging analysis approaches are discussed: Likelihood maps from point source scans are utilized for searches of emission regions; astrophysical source models are fitted to the measurement with the maximum likelihood method; deconvolved images are produced with the maximum entropy algorithm. Simulations and statistical analysis with the bootstrap method demonstrate that the intensity irregularity and asymmetry along the Galactic plane is significant, although weaker individual features are insignificant by themselves. The comparison of classical Al-26 source tracer distributions shows that none of these models represents the COMPTEL data well. The measured 1.809 MeV feature from the Vela region, positionally consistent with the Vela supernova remnant, shows an indication for extended emission.

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