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

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

2003-09-02

arxiv.org/abs/astro-ph/0309042v1

Astron.Astrophys.418:255-263,2004

Astronomy and Astrophysics

Astrophysics

9 pages, including 4 figures. Submitted to A&A

Scientific paper

10.1051/0004-6361:20034258

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. For the radio bright observation we measured a delay between changes in the X-ray spectral hardness and the radio brightness of ~40 minutes, similar to what has been found in the micro-quasar GRS 1915+105. We compare our results with those of GRS 1915+105 and the atoll/Z-type neutron star X-ray binaries. Although it has some properties that do not match with either atoll or Z sources, GX 13+1 seems more similar to the Z sources.

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