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Line Shape Diagnositics Of Galactic 26al, K. Kretschmer, R. Diehl, Dieter H. Hartmann
Line Shape Diagnositics Of Galactic 26al, K. Kretschmer, R. Diehl, Dieter H. Hartmann
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The shape of the gamma-ray line from radioactive 26Al, at 1808.7 keV energy in the frame of the decaying isotope,is determined by its kinematics when it decays, typically 106y after its ejection into the interstellar medium from its nucleosyn-thesis source. Three measurements of the line width exist: HEAO-C’s 1982 value of (0 + 3) keV FWHM, the GRIS 1996 valueof (5. 4 ± 1. 3) keV FWHM, and the recent RHESSI value of (2. 0 ± 0. 8) keV FWHM, suggesting either “cold”, “hot”, or “warm”26Al in the ISM. We model the line width as expected from Galactic rotation, expanding …