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 similar to0.25 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 similar to40 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.
Original language | English |
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Pages (from-to) | 255-263 |
Number of pages | 9 |
Journal | Experimental Astronomy |
Volume | 418 |
DOIs | |
Publication status | Published - Apr 2004 |
Keywords
- accretion, accretion disks
- stars : individual : GX 13+1
- stars : neutron
- ISM : jets and outflows
- X-rays : binaries
- radio continuum : stars
- QUASI-PERIODIC OSCILLATION
- BROAD-BAND SPECTRUM
- TIMING EXPLORER
- PROPORTIONAL COUNTER
- SCORPIUS X-1
- CYGNUS X-2
- HARD TAIL
- GX 13+1
- COMPTONIZATION MODELS
- GRS 1915+105