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We report the discovery of an X‐ray counterpart to the southern radio hotspot of the largest‐known radio quasar 4C 74.26 (whose redshift is  z = 0.104). Both  XMM–Newton  and  Chandra  images reveal the same significant (10 arcsec i.e. 19 kpc) offset between the X‐ray hotspot and the radio hotspot imaged with MERLIN. The peak of the X‐ray emission may be either due to synchrotron emission or due to inverse‐Compton emission. If synchrotron emission, the hotspot represents the site of particle acceleration and the offset arises from either the jet exhibiting Scheuer's ‘dentist's drill’ effect or a fast spine having less momentum than the sheath surrounding it, which creates the radio hotspot. If the emission arises from the inverse‐Compton process, it must be inverse‐Compton scattering of the cosmic microwave background in a decelerating relativistic flow, implying that the jet is relativistic (Γ≥ 2) out to a distance of at least 800 kpc. Our analysis, including optical data from the Liverpool Telescope, rules out a background active galactic nucleus for the X‐ray emission and confirms its nature as a hotspot, making it the most‐X‐ray‐luminous hotspot detected at low redshift.

The luminous X‐ray hotspot in 4C 74.26: synchrotron or inverse‐Compton emission?