Angular distribution of interstellar Al-26
Abstract
The angular distribution and local concentration of interstellar Al-26 are calculated for five theoretical models of its origin, as a guide for future observations. The models considered relate Al-26 to current star formation (with surface CO density as its indicator), treat Al-26 as a secondary-nucleosynthesis product on seed nuclei with the same metallicity gradient as O, assume the Al-26 ejection rate is proportional to present light output, make Al-26 synthesis depend on total H I + H2 gas density, or assume that Al-26 is formed mainly in novae. The local decay and production rates for the five models are found to lie within a factor of 2 of surface density 0.0003/sq cm s, corresponding to a present (Al-26)/(Al-27) ratio of 5 x 10 to the -6th averaged over H I and H2 phases.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1985
- DOI:
- 10.1086/163326
- Bibcode:
- 1985ApJ...294..591L
- Keywords:
-
- Aluminum 26;
- Gamma Ray Astronomy;
- Interstellar Chemistry;
- Metallicity;
- Novae;
- Nuclear Fusion;
- Allende Meteorite;
- Aluminum 27;
- Angular Distribution;
- Astronomical Models;
- Heao 3;
- Interstellar Gas;
- Milky Way Galaxy;
- Astrophysics