High-Energy Gamma Rays from Polars

Details High-Energy Gamma Rays from Polars High-Energy Gamma Rays from Polars

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..334b&link_type=abstract

Astrophysical Journal v.450, p.334

Astronomy and Astrophysics

Astronomy

2

Gamma Rays: Observations, Particle Acceleration, Stars: Novae, Cataclysmic Variables

Scientific paper

An analysis of the EGRET phase 1 data was made to search for γ-ray emission from the magnetic cataclysmic variables V834 Cen, VV Pup, and AM Her. These sources were not detected using either a steady (DC) or a periodic (AC) analysis. These results are consistent with the upper limit detected by the Whipple Observatory at TeV energies, if we assume that γ-rays are produced, via pion decay, from accelerated protons with a power-law energy spectrum of -2, and are inconsistent with a claimed detection at TeV energies by the Gulmarg Observatory. Our results show that the γ-ray luminosity from polars is less than 1 % of the bolometric luminosity and that the acceleration of particles (protons) to γ-ray energies by diffusive shocks is probably not important for polars.

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