VLBI observations of the shortest orbital period black hole binary, MAXI J1659-152

Z. Paragi, A. J. van der Horst, T. Belloni, J. C.A. Miller-Jones, J. Linford, G. Taylor, J. Yang, M. A. Garrett, J. Granot, C. Kouveliotou, E. Kuulkers, R. A.M.J. Wijers

Research output: Contribution to journalArticlepeer-review


The X-ray transient MAXI J1659-152 was discovered by Swift/Burst Alert Telescope and it was initially identified as a gamma-ray burst. Soon its Galactic origin and binary nature were established. There exists a wealth of multiwavelength monitoring data for this source, providing a great coverage of the full X-ray transition in this candidate black hole binary system. We obtained two epochs of European very long baseline interferometry (VLBI) Network (EVN) electronic-VLBI and four epochs of Very Long Baseline Array data of MAXI J1659-152 which show evidence for outflow in the early phases. The overall source properties (polarization, milliarcsecond-scale radio structure, flat radio spectrum) are described well with the presence of a compact jet in the system through the transition from the hard-intermediate to the soft X-ray spectral state. The apparent dependence of source size and the radio core position on the observed flux density (luminosity-dependent core shift) supports this interpretation as well. We see no evidence for major discrete ejecta during the outburst. For the source proper motion we derive 2σ upper limits of 115 μasd-1 in right ascension, and 37 μas d-1 in declination, over a time baseline of 12 d. These correspond to velocities of 1400 and 440 km s-1, respectively, assuming a source distance of ~7 kpc.

Original languageEnglish
Pages (from-to)1319-1329
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Jun 2013


  • Ism: jets and outflows
  • Stars: individual: MAXI J1659-152
  • X-rays: binaries


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