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We compile the radio-optical-X-ray spectral energy distributions (SEDs) of 65knots and 29 hotspots in 41 active galactic nucleus jets to examine their highenergy radiation mechanisms. Their SEDs can be fitted with the single-zoneleptonic models, except for the hotspot of Pictor A and six knots of 3C 273.The X-ray emission of one hotspot and 22 knots is well explained as synchrotronradiations under the equipartition condition; they usually have lower X-ray andradio luminosities than the others, which may be due to a lower beaming factor.An inverse Compton (IC) process is involved for explaining the X-ray emissionof the other SEDs. Without considering the equipartition condition, their X-rayemission can be attributed to the synchrotron-self-Compton (SSC) process, butthe derived jet power (P_jet) are not correlated with L_k and most of them arelarger than L_k with more than three orders of magnitude, where L_k is the jetkinetic power estimated with their radio emission. Under the equipartitioncondition, the X-ray emission is well interpreted with the IC process to thecosmic microwave background photons (IC/CMB). In this scenario, the derivedP_jet of knots and hotspots are correlated with and comparable to L_k. Theseresults suggest that the IC/CMB model may be the promising interpretation oftheir X-ray emission. In addition, a tentative knot-hotspot sequence in thesynchrotron peak-energy--peak-luminosity plane is observed, similar to theblazar sequence, which may be attributed to their different cooling mechanismsof electrons.

Examining High Energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets