A simple formula for the thermal pair annihilation line emissivity

1996/07/13 by Roland Svensson, Svensson, Roland, S. Larsson +4 · 1 citation
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Atomic and Molecular Physics #FOS: Physical sciences #Plasma Diagnostics and Applications #Solar and Space Plasma Dynamics #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9607069

4 pages; l-aa style; 2 postscript figures; Proceedings of 3rd Compton Gamma-Ray Observatory Symposium, Munich, 1995

arxiv created 1996/07/13 · openalex publication_date 1996/07/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We introduce a simple and convenient fitting formula for the thermal annihilation line from pair plasmas in cosmic sources. The fitting formula is accurate to 0.04% and is valid at all photon energies and temperatures of interest. The commonly used Gaussian line profile is not a good approximation for broader lines.

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