Detection of a very low hard X-ray pulse fraction in the bright state of GX 1+4

Details Detection of a very low hard X-ray pulse fraction in the bright state of GX 1+4 Detection of a very low hard X-ray pulse fraction in the bright state of GX 1+4

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289l..43r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. L43-L46

Astronomy and Astrophysics

Astrophysics

11

Balloon-Borne Instruments, Milky Way Galaxy, Pulsars, Pulsed Radiation, Stellar Rotation, X Ray Spectra, Luminosity, Pulse Rate, Spectrum Analysis, Spin

Scientific paper

We have observed the Galactic center hard X-ray pulsar GX 1+4 on 1993 December 11, in the energy range of 20 - 100 keV with a balloon-borne Xenon filled Multi-cell Proportional Counter (XMPC) telescope. The source was detected in a bright state, the average observed source count rate being 10.1 +/- 0.2/s per detector. X-ray pulsations with a period of 121.0 +/- 0.4 s were detected in the source at a very high significance level. This, compared with the Burst and Transient Source Experiment (BATSE) observations, gives a spin down rate of dot-P = 1.6 +/- 1.4 s/yr. The pulse fraction in the hard X-ray range is low (35%), and the observed spectrum is very hard (power law energy index 0.54 +/- 0.18). The observed source luminosity in the 20 - 100 keV range is 7.9 +/- 0.3 x 1037 erg/s. These properties are similar to those seen during high luminosity spin up state of early 1970s and suggest that the source should revert back to a a spin-up episode.

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