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New Chandra observations of the jet in 3C273. I. Softer X-ray than radio spectra and the X-ray emission mechanism

S. Jester·D. E. Harris·H. L. Marshall·K. Meisenheimer
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Abstract

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.

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S. Jester, D. E. Harris, H. L. Marshall, K. Meisenheimer. 2006-05-20. New Chandra observations of the jet in 3C273. I. Softer X-ray than radio spectra and the X-ray emission mechanism. https://doi.org/10.1086/505962

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