Photon spectrum and period evolution of GX 1+4 as observed at hard X-ray energies by SIGMA

Details Photon spectrum and period evolution of GX 1+4 as observed at hard X-ray energies by SIGMA Photon spectrum and period evolution of GX 1+4 as observed at hard X-ray energies by SIGMA

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..444l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 2, p. 444-448

Astronomy and Astrophysics

Astrophysics

19

Bremsstrahlung, Galactic Bulge, Gamma Rays, H Alpha Line, Neutron Stars, Pulsars, X Ray Stars, Exosat Satellite, Gamma Ray Observatory, Stellar Luminosity, Stellar Magnetic Fields, Telescopes

Scientific paper

The galactic pulsar GX 1+4 has been detected by the coded-aperture hard X-ray/soft gamma-ray SIGMA telescope during the 1991 observations of the Galactic Center (GC) region. The source, whose emission varied during the survey by more than 40%, reached a maximum luminosity in the 40-77 keV range of 5.0 1036 erg/s (d = 8.5 kpc), thus approaching the emission level of the 1970-1980 high state. Periodic flux variations (2 min. period) have been detected in Spring and Fall of 1991. Comparison with the periods measured in the eighties shows that the spin-down behavior of GX 1+4 is rather complex.

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