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

J Homan, R Wijnands, M P Rupen, R Fender, R M Hjellming, T di Salvo, M van der Klis

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)255-263
Number of pages9
JournalExperimental Astronomy
Volume418
DOIs
Publication statusPublished - 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

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