We present arc-second-resolution data in the radio , IR , optical and X-ray for 4C+19.44 ( =PKS 1354+195 ) , the longest and straightest quasar jet with deep X-ray observations .
We report results from radio images with half to one arc-second angular resolution at three frequencies , plus HST and Spitzer data .
The Chandra data allow us to measure the X-ray spectral index in 10 distinct regions along the 18 \arcsec jet and compare with the radio index .
The radio and X-ray spectral indices of the jet regions are consistent with a value of \alpha = 0.80 throughout the jet , to within 2 \sigma uncertainties .
The X-ray jet structure to the south extends beyond the prominent radio jet and connects to the southern radio lobe , and there is extended X-ray emission in the direction of the unseen counter jet and coincident with the northern radio lobe .
This jet is remarkable since its straight appearance over a large distance allows the geometry factors to be taken as fixed along the jet .
Using the model of inverse Compton scattering of the cosmic microwave background ( iC/CMB ) by relativistic electrons , we find that the magnetic field strengths and Doppler factors are relatively constant along the jet .
If instead the X-rays are synchrotron emission , they must arise from a population of electrons distinct from the particles producing the radio synchrotron spectrum .