EDP Sciences
Free access
Volume 409, Number 1, October I 2003
Page(s) 9 - 19
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20031060

A&A 409, 9-19 (2003)
DOI: 10.1051/0004-6361:20031060

Cyclotron-synchrotron: Harmonic fitting functions in the non-relativistic and trans-relativistic regimes

A. Marcowith1 and J. Malzac2, 3

1  C.E.S.R., 9 Av. du Colonnel Roche, 31028 Toulouse Cedex 4, France
2  Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
3  Osservatorio di Brera, via Brera, 28, 20121 Milano, Italy
    e-mail: malzac@ast.cam.ac.uk

(Received 14 April 2003 / Accepted 30 June 2003)

The present work investigates the calculation of absorption and emission cyclotron line profiles in the non-relativistic and trans-relativistic regimes. We provide fits for the ten first harmonics with synthetic functions down to 10-4 of the maximum flux with an accuracy of 20% at worst. The lines at a given particle energy are calculated from the integration of the Schott formula over the photon and the particle solid angles relative to the magnetic field direction. The method can easily be extended to a larger number of harmonics. We also derive spectral fits of thermal emission line plasmas at non-relativistic and trans-relativistic temperatures extending previous parameterisations.

Key words: line: profiles -- magnetic fields -- radiation mechanisms: non-thermal, thermal

Offprint request: A. Marcowith, Alexandre.Marcowith@cesr.fr

© ESO 2003