Evolution of the X-ray jets from 4U 1755-33

P. Kaaret, S. Corbel, J. A. Tomsick, J. Lazendic, A. K. Tzioumis, Y. Butt, R. Wijnands

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13 Citations (Scopus)


We report on new X-ray observations of the large-scale jets recently discovered in X-rays from the black hole candidate 4U 1755-33. Our observations in 2004 show that the jets found in 2001 are still present in X-rays. However, sensitive radio observations in 2004 failed to detect the jets. We suggest that synchrotron radiation is a viable emission mechanism for the jets and that thermal bremsstrahlung and inverse Compton emission are unlikely on energetic grounds. In the synchrotron interpretation, the production of X-rays requires acceleration of electrons up to ∼60 TeV, the jet power is ∼4 × 1035 ergs s-1, and the radio nondetection requires a spectral index α > -0.65 (Sv α Vα), which is similar to the indexes found in lobes surrounding some other compact objects. We find an upper limit on the flux of 4U 1755-33 in quiescence of 5 × 10-16 ergs cm-2 s-1 in the 0.3-8 keV band.

Original languageEnglish
Pages (from-to)410-417
Number of pages8
JournalAstrophysical Journal
Issue number1 I
Publication statusPublished - 10 Apr 2006
Externally publishedYes


  • Black hole physics
  • Stars: individual (4U 1755-33)
  • Stars: winds, outflows X-rays: binaries


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