Deep Chandra and multicolor HST follow-up of the jets in two powerful   radio quasars
  We present deep (70-80 ks) Chandra and multicolor HST ACS images of two jets hosted by the powerful quasars 1136-135 and 1150+497, together with new radio observations. The sources have an FRII morphology and were selected from our previous X-ray and optical jet survey for detailed follow up aimed at obtaining better constraints on the jet multiwavelength morphology and X-ray and optical spectra of individual knots, and to test emission models deriving physical parameters more accurately. All the X-ray and optical knots detected in our previous short exposures are confirmed, together with a few new faint features. The overlayed maps and the emissivity profiles along the jet show good correspondence between emission regions at the various wavelengths; a few show offsets between the knots peaks of <1". In 1150+497 the X-ray, optical, and radio profiles decrease in similar ways with distance from the core up to ~7", after which the radio emission increases more than the X-ray one. No X-ray spectral variations are observed in 1150+497. In 1136-135 an interesting behavior is observed, whereby, downstream of the most prominent knot at ~ 6.5" from the core, the X-ray emission fades while the radio emission brightens. The X-ray spectrum also varies, with the X-ray photon index flattening from ~2 in the inner part to ~1.7 to the end of the jet. We intepret the jet behavior in 1136-135 in a scenario where the relativistic flow suffers systematic deceleration along the jet, and briefly discuss the major consequences of this scenario (abridged). 
R. Sambruna (1), M. Gliozzi (2), D. Donato (2), L. Maraschi (3), F.   Tavecchio (3), C.C. Cheung (4), M. Urry (5), J.F.C. Wa...