A Multi-band Study of the remarkable Jet in Quasar 4C+19.44

Kavli Affiliate: Herman Marshall

| First 5 Authors: Daniel Harris, Nicholas Lee, Dan Schwartz, Aneta Siemiginowska, Francesco Massaro

| Summary:

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.

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