Abstract
We present images of infrared emission from the radio jet in 3C66B. Data at three wavelengths (4.5, 6.75 and 14.5 µm) were obtained using the Infrared Space Observatory. The 6.75 µm image clearly shows an extension aligned with the radio structure. The jet was also detected in the 14.5 µm image, but not at 4.5 µm. The radio-infraredoptical spectrum of the jet can be interpreted as synchrotron emission from a population of electrons with a high-energy break of 4×10 11 eV. We place upper limits on the IR flux from the radio counter-jet. A symmetrical, relativistically beamed twin-jet structure is consistent with our results if the jets consist of multiple components.
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