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| Authors | J. Homan, R.A.D. Wijnands, M.P. Rupen, R.P. Fender, R.M. Hjellming, T. di Salvo, M. van der Klis | | Title | Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1 |
| Journal | Astronomy and Astrophysics |
| Volume | 418 |
| Year | 2004 |
| Pages | 255-263 |
| ISSN | 00046361 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Astronomical Institute Anton Pannekoek (IAP) |
| 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 min, 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. |
| Document type | Article |
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