Cosmic rays V.
Cosmic rays V.
The nonthermal radio emission of the old nova GK Per - a signature of hadronic interactions?
Peter L. Biermann (1), Richard G. Strom (2), Heino Falcke (1)
(1) Max-Planck Institut für Radioastronomie, Auf dem Hügel 69, D-53121
(2) Netherlands Foundation for Research in Astronomy, Radiosterrenwacht,
P.O.Box 2, NL-7990 AA Dwingeloo, The Netherlands
Astronomy and Astrophysics, in press
Using the model of particle acceleration in shocks in stellar winds developed
by Biermann (1993) and Biermann and Cassinelli (1993) we demonstrate that
the nonthermal radio emission spectrum from the cataclysmic variable binary
star GK Per can be interpreted consistently. We propose that the radio
spectrum results from hadronic secondary electrons/positrons, which, in
the optically thin case, give a characteristic radio spectrum with a spectral
index of +1/3 below a maximum and, for a strong shock in a wind slow compared
to the shock speed, of -0.7 above the maximum. We test the proposed
concept for consistency with the radio data for OB and Wolf Rayet stars as
well as radiosupernovae. There is some evidence that this process is
important for the radio emission from active galactic nuclei, both in compact
and extended emission. We argue that such a radio spectrum is a unique
characteristic for hadronic interactions.
Paper: Available in PostScript
and Tex Format.
Other publications can be found here.
Questions: Heino Falcke, firstname.lastname@example.org