Gamma-ray lines from cosmic-ray interactions with interstellar dust grains

Details Gamma-ray lines from cosmic-ray interactions with interstellar dust grains Gamma-ray lines from cosmic-ray interactions with interstellar dust grains

2003-10-29

arxiv.org/abs/astro-ph/0310827v1

New Astron.Rev. 48 (2004) 99-103

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, to be published in New Astronomy Reviews (proceedings of the Workshop "Astronomy with Radioactivities IV a

Scientific paper

10.1016/j.newar.2003.11.013

As pointed out by Lingenfelter and Ramaty (1977), the shapes of some gamma-ray lines produced by cosmic-ray interactions with the interstellar medium potentially contain valuable information on the physical properties of dust grains, including their compositions and size distributions. The most promising of such lines are at 847, 1369, 1779 and 6129 keV, from 56-Fe*, 24-Mg*, 28-Si* and 16-O*, respectively. We performed detailed calculations of their profiles using, in particular, available laboratory measurements combined with optical model calculations to evaluate the energy distributions of the recoiling excited nuclei. We show that the line shapes are mainly sensitive to relatively large interstellar grains, with radii greater than 0.25 microns. Line fluxes from the inner Galaxy are then predicted.

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