Evolution of the X-Ray Jets from 4U 1755--33

Details Evolution of the X-Ray Jets from 4U 1755--33 Evolution of the X-Ray Jets from 4U 1755--33

2005-12-09

arxiv.org/abs/astro-ph/0512240v1

Astrophys.J.641:410-417,2006

Astronomy and Astrophysics

Astrophysics

accepted by ApJ, 11 pages, 2 color figures

Scientific paper

10.1086/500399

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 ~ 4x10^35 erg s^-1, and the radio non-detection requires a spectral index alpha > -0.65 (S_\nu \propto \nu^\alpha) 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 5x10^-16 erg cm^-2 s^-1 in the 0.3-8 keV band.

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