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Astron. Astrophys. 326, 417-418

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Research Note

On the use of nonrelativistic bremsstrahlung cross sections
in astrophysics

Eberhard Haug

Institut für Astronomie und Astrophysik, Universität Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany
(Telefax 07071/295889, e-mail: haug@ait.physik.uni-tuebingen.de)

Received 27 February 1997 / Accepted 28 February 1997


The nonrelativistic Bethe-Heitler cross section for bremsstrahlung often used in astrophysical applications is a poor approximation at initial electron energies above 30 keV. Therefore a simple formula is given which is accurate up to semirelativistic energies. An extension of this expression can be applied in the whole energy range.

Key words: radiation mechanisms: non-thermal

© European Southern Observatory (ESO) 1997

Online publication: September 9, 1997
Last change: April 20, 1998