Detection and period measurements of GX1+4 at hard X ray energies with the SIGMA telescope

Details Detection and period measurements of GX1+4 at hard X ray energies with the SIGMA telescope Detection and period measurements of GX1+4 at hard X ray energies with the SIGMA telescope

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..209l&link_type=abstract

In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 209-216 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

2

Annihilation Reactions, Binary Stars, Emission Spectra, Galactic Mass, Stellar Luminosity, Stellar Mass, X Ray Spectra, Apertures, Energy Spectra, Galactic Nuclei, Gamma Ray Telescopes, Unsteady Flow, X Ray Astronomy, X Ray Stars

Scientific paper

The galactic Low Mass X ray Binary GX1+4 was detected by the coded aperture hard X ray gamma ray SIGMA telescope during the Feb. to April 1991 observations of the galactic center regions. The source, whose emission varied during the survey of a factor greater than 40 pct., reached a maximum luminosity in the 40 to 140 energy range of 1.03 x 1037 erg/s (D = 8.5 kpc), thus approaching the emission level of the 1970 to 1980 high state. Two minute flux pulsations were detected on Mar. 22 and on Mar. 31 and Apr. 1. Comparison with the last period measurements shows that the current spin-down phase of GX1+4 is ending. Concerning the proposed association of this source with the galactic center 511 keV annihilation emission, upper limits were derived.

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