Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..103k&link_type=abstract
Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific
Physics
1
Scientific paper
The detailed appearance of the 1808.7 keV gamma-ray line from radioactive 26 Al is determined by its kinematics when it decays, typically 106 y after its ejection into the interstellar medium from its nucleosynthesis source. We model the line shape as expected from Galactic rotation and expanding supernova ejecta, and predict a value below 1 keV (FWHM) with plausible assumptions about 26 Al initial velocities and expansion history. Our results suggest that standard 26 Al ejection models produce a line on the narrow side of what is observed by RHESSI and INTEGRAL. Improved INTEGRAL and RHESSI spatially-resolved line width measurements should help to disentangle the effects of Galactic rotation and of ISM trajectories of 26 Al on the line shape. Key words: nuclear reactions, nucleosynthesis, abundances gamma rays: observations supernovae: general ISM: supernova remnants stars: formation..
Diehl Roland
Hartmann Dieter H.
Kretschmer Karsten
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