منابع مشابه
Image reconstruction of COMPTEL 1.8 MeV 26Al line data
We present a new algorithm, called Multiresolution Regularized Expectation Maximization (MREM), for the reconstruction of γ-ray intensity maps from COMPTEL data. The algorithm is based on the iterative Richardson-Lucy scheme to which we added a wavelet thresholding step in order to eliminate image-noise in the reconstruction. The wavelet thresholding explicitly accounts for spatial correlations...
متن کاملA multiwavelength comparison of COMPTEL 1.8 MeV 26Al line data
We search for correlations between 1.809 MeV γ-ray line emission, attributed to the radioactive decay of 26Al, and intensity distributions observed at other wavelengths by confronting CGRO COMPTEL 1.8 MeV data with an extended database of all-sky maps. The database contains 31 all-sky maps, covering the entire explored wavelength range from the radio band up to high-energy gamma-rays. Different...
متن کاملCOMPTEL ALL-SKY IMAGING AT 2.2 MeV
It is now generally accepted that accretion of matter onto a compact object (white dwarf, neutron star or black hole) is one of the most efficient processes in the universe for producing high energy radiations. The efficient conversion of gravitational potential enegy into kinetic energy is believed to be the primary source of power for X-ray binaries and for Active Galactic Nuclei (AGN). An un...
متن کاملMaximum Entropy Imaging of Comptel Data
The Maximum Entropy method is a practical technique for generating intensity skymaps from Compton-telescope data. The application of the method to COMPTEL data for point sources and large-scale emission is described. New developments in the method are illustrated.
متن کاملRadioactive 26Al from the Scorpius-Centaurus association
Context. The Scorpius-Centaurus association is the most-nearby group of massive and young stars. As nuclear-fusion products are ejected by massive stars and supernovae into the surrounding interstellar medium, the search for characteristic γ-rays from radioactivity is one way to probe the history of activity of such nearby massive stars on a My time scale through their nucleosynthesis. 26Al dec...
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ژورنال
عنوان ژورنال: Advances in Space Research
سال: 1995
ISSN: 0273-1177
DOI: 10.1016/0273-1177(94)00050-b