Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2077k&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The 1.809 MeV gamma-ray line from radioactive 26 Al observed towards the galactic center shows a line width of ≈ 5 keV. If interpreted as kinematic broadening, the required velocities are ≈ 500 km/s. The acceleration of cosmic rays from the interstellar medium (ISM), is commonly assumed to take place in shock regions associated with groups of massive stars. In that case, freshly-produced 26 Al should be among the accelerated nuclei, and the velocity distribution of these particles is a function of the gas density, the assumed grain size, and typical separations between supernova remnants. Studies have shown that 26 Al embedded in these dust particles can easily reach and maintain velocities of order of 1000 km/s, and thus explain the observed width of the 1.809 MeV line. Stellar winds and supernova explosions in star forming regions can drive large, rapidly expanding superbubbles into the ISM. Shocks propagating inside the bubble accelerate dust particles and with it the 26 Al they contain. We discuss the resulting shape of the 1.809 MeV line.
Diehl Roland
Ellison Donald C.
Hartmann Dieter H.
Kretschmer Karsten
Plüschke S.
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