Low-Energy Gamma-Rays from Pulsar GX:1+4 - Balloon Results

Details Low-Energy Gamma-Rays from Pulsar GX:1+4 - Balloon Results Low-Energy Gamma-Rays from Pulsar GX:1+4 - Balloon Results

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138..183j&link_type=abstract

Astrophysics and Space Science, Volume 138, Issue 1, pp.183-189

Astronomy and Astrophysics

Astrophysics

14

Scientific paper

We present the results from a search of pulsed emission in low-energy gamma-rays from GX 1+4 source observed during zenith transit in a balloon experiment in April 1982. The observed pulsar period is 120.6±0.2 s with pulsed emission flux of (1.3±0.4)×10-5 photons cm-2s-1 keV-1 at an average energy ˜342 keV. These pulsations, observed at gamma-ray energies perhaps for the first time from any X-ray pulsar, in conjunction with the period determined in X-rays, indicate a spin-down in contrast with the spin-up behaviour observed by others at earlier epochs.

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