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

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.137..233j&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 137, no. 2, Oct. 1987, p. 233-238. FINEP-supported research.

Astronomy and Astrophysics

Astronomy

4

Balloon-Borne Instruments, Pulsars, Stellar Radiation, Stellar Spectra, X Ray Binaries, Heao 1, Light Curve, Line Spectra, X Ray Astronomy

Scientific paper

The authors 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±0.2s with pulsed emission flux of (1.3±0.4)×10-5 photons cm-2s-1keV-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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