Radio Identification of GX 5-1

MOST Radio Monitoring of GX 339 − 4

The Molonglo Observatory Synthesis Telescope (MOST) has been monitoring the candidate Galactic black hole binary system GX339−4 at 843 MHz since 1994 April. We present the results of this program up to 1997 February and show a possible correlation between radio and X-ray light curves.

Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1

We present the results of two simultaneous X-ray/radio observations of the low-mass X-ray binary GX 13+1, performed in July/ August 1999 with the Rossi X-ray Timing Explorer and the Very Large Array. In X-rays the source was observed in two distinct spectral states; a soft state, which had a corresponding 6 cm flux density of ∼0.25 mJy, and a hard state, which was much brighter at 1.3–7.2 mJy. ...

Accretion Column Disruption in Gx 1+4

Daily observations of the binary X-ray pulsar GX 1+4 were made with the Rossi Xray Timing Explorer (RXTE ) satellite between 1997 May 16–20 as part of a four-month monitoring program. On May 17 the sharp dips normally observed in the lightcurve were all but absent, resulting in a pulse fraction fp ≈ 0.5 instead of the more typical value of ≈ 0.8 measured before and after. Also observed was a dr...

The phase-delay spectrum of GX 5-1 on its normal branch

We have measured the phase differences between Xray intensity variations in different energy bands in data taken with Ginga of the Z source GX 5-1 in its normal branch. We apply a χ2 optimal extraction technique to measure the phasedelay spectrum of the normal-branch quasi-periodic oscillations (QPO) and find a jump at 3.5 keV. X-ray intensity variations at the QPO frequency in energy channels ...

Arria II GX Device Handbook, Volume 1