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Astron. Astrophys. 339, 917-920 (1998)
Research Note
On beaming due to coherent inverse Compton scattering
Thomas Kunzl 1, 3,
Harald Lesch 1 and
Axel Jessner 2
1 Institut für Astronomie und Astrophysik der
Universität München, Scheinerstrasse 1, D-81679
München, Germany
2 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, D-53121 Bonn, Germany
3 Max-Planck-Institut für Extraterrestrische Physik,
Giessenbachstrasse, D-85740 Garching, Germany
Received 14 May 1998 / Accepted 5 August 1998
Abstract
We calculate the beaming of coherent emission by means of
geometrical optics. When spherical elementary waves are phase-coupled
in that way that constructive interference occurs along one axis, the
intensity is lower for off-axis viewing angles. The spatial angle of
constructive interference shrinks to a fraction of
![[FORMULA]](img1.gif)
when the length scale of the emission region is
larger than the wavelength of the radiation. This leads to an
amplification of the received radiation in addition to the
relativistic beaming caused by the relativistic radial outflow which
is thought to be important for the radio emission of pulsars. The
effect will be calculated by numerical methods and can be approximated
by a simple analytic expression.
Key words: stars: pulsars:
general 
radiation mechanisms: non-thermal
Send offprint requests to: Th. Kunzl, (tak@usm.uni-muenchen.de)
This article contains no SIMBAD objects.
Contents
© European Southern Observatory (ESO) 1998
Online publication: October 22, 1998
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