Simultaneous Radio and X-ray Observations of the Low Mass X-ray Binary GX 13+1

Tiziana Di Salvo, Jeroen Homan, Van Der Klis, Hjellming, Rupen, Wijnands, Fender, Di Salvo

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27 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)255-263
Number of pages9
JournalASTRONOMY & ASTROPHYSICS
Volume418
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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