Dark jets in the soft X-ray state of black hole binaries?

Abstract

X-ray binary observations led to the interpretation that powerful compact jets, produced in the hard state, are quenched when the source transitions to its soft state. The aim of this paper is to discuss the possibility that a powerful dark jet is still present in the soft state. Using the black hole X-ray binaries GX339-4 and H1743-322 as test cases, we feed observed X-ray power density spectra in the soft state of these two sources to an internal shock jet model. Remarkably, the predicted radio emission is consistent with current upper-limits. Our results show that, for these two sources, a compact dark jet could persist in the soft state with no major modification of its kinetic power compared to the hard state.

arXiv comment7 pages, 3 figures, 1 table, accepted for publication in MNRAS

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• A wildly flickering jet in the black hole X-ray binary MAXI J1535-571
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• The stringent upper limit on jet power in the persistent soft state source 4U~1957+11
• On the nature of the soft gamma-ray emission in the hard state of the black hole transient GRS 1716-249
• Peering at the outflow mechanisms in the transitional pulsar PSR J1023+0038: simultaneous VLT, XMM-Newton, and Swift high-time resolution observations
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