When Will the Peculiar X-Ray Pulsar GX:1+4 Resume Fast Spin-Up

Details When Will the Peculiar X-Ray Pulsar GX:1+4 Resume Fast Spin-Up When Will the Peculiar X-Ray Pulsar GX:1+4 Resume Fast Spin-Up

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246p..11s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO. 1/SEP1, P. 11P, 1990

Astronomy and Astrophysics

Astronomy

18

Scientific paper

Results from observations of the ˜110-s X-ray pulsar GX 1+4 (4U 1728-24), made with the GINGA satellite in 1989 August, are reported. The absorption- corrected 2-20-keV luminosity of the source was 1.2 × 1037 erg s-1 at an assumed distance of 10 kpc, which is ˜10 and ˜2 times larger than in 1987 March and 1988 March, respectively. This implies that GX 1+4 is emerging from the extended low state which lasted over the middle 1 980s. The observed pulse period, P = 113.626±0.002 s, indicates that GX 1+4 has been spinning down monotonically at least since 1987 March, in contrast to the fast spin-up observed through the 1970s. A remarkable discovery is that the intensity increase since 1987 has hardly affected the spin-down rate, Pṡ=4.5 × 10-8 s s-1. The 2-30-keV source spectrum is little different in shape from those observed in the 1970s.

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