Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1
Abstract
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.
Cite
@article{arxiv.astro-ph/0309042,
title = {Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1},
author = {Jeroen Homan and Rudy Wijnands and Michael P. Rupen and Rob Fender and Robert M. Hjellming and Tiziana di Salvo and Michiel van der Klis},
journal= {arXiv preprint arXiv:astro-ph/0309042},
year = {2009}
}
Comments
9 pages, including 4 figures. Submitted to A&A