Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssu..rept.....c&link_type=abstract
Technical Report, Sonoma State Univ. Rohnert Park, CA United States Dept. of Physics and Astronomy
Astronomy and Astrophysics
Astronomy
X Rays, Observation, Luminosity, B Stars, X Ray Spectra, Pulsar Magnetospheres, Unsteady Flow, Synchrotron Radiation, Spectra, Relativistic Particles, Pulsars, Photons, Modulation
Scientific paper
We report the results from X-ray and hard X-ray observations of the PSR B1259-63/SS 2883 system with the ASCA and the CGRO satellites, performed between 1995 February and 1996 January when the pulsar was near apastron. The system was clearly detected in each of the two ASCA observations with luminosity in the 1-10 keV band of LX = (9 +/- 3) x 1032 (d/2 kpc) erg/ s, while OSSE did not detect significant hard X-rays from the system. X-ray spectra obtained with ASCA show a single power-law spectrum with a photon index of 1.6 +/- 0.3. No pulsations were detected in either the ASCA nor the OSSE data. Combined with previous results from X-ray and hard X-ray observations, we obtained binary modulation in X-ray luminosity and photon index of high energy emission from the system for the entire orbit. The results are in agreement with predictions based on synchrotron emission model from relativistic particles in a shocked pulsar wind interacting with the gaseous outflow from the Be star.
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