Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-20
Astrophys.J.648:900-909,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 5 figures, emulateapj. Accepted by ApJ
Scientific paper
10.1086/505962
The jet in 3C273 is a high-power quasar jet with radio, optical and X-ray emission whose size and brightness allow a detailed study of the emission processes acting in it. We present deep Chandra observations of this jet and analyse the spectral properties of the jet emission from radio through X-rays. We find that the X-ray spectra are significantly softer than the radio spectra in all regions of the bright part of the jet except for the first bright "knot A", ruling out a model in which the X-ray emission from the entire jet arises from beamed inverse-Compton scattering of cosmic microwave background photons in a single-zone jet flow. Within two-zone jet models, we find that a synchrotron origin for the jet's X-rays requires fewer additional assumptions than an inverse-Compton model, especially if velocity shear leads to efficient particle acceleration in jet flows.
Harris Daniel E.
Jester Sebastian
Marshall Herman L.
Meisenheimer Klaus
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