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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308714.0, MPI für Astronomie / Publikationen_mpia
New Chandra observations of the Jet in 3C 273. I. Softer X-ray than radio spectra and the X-ray emission mechanism
Authors:Jester, S.; Harris, D. E.; Marshall, H. L.; Meisenheimer, K.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:900
End Page:909
Audience:Not Specified
Abstract / Description:The jet in 3C 273 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 analyze 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.
Free Keywords:Acceleration of Particles; Galaxies: Jets; Galaxies: Quasars: Individual: Alphanumeric: 3C 273; Radiation Mechanisms: Nonthermal; X-Rays: Galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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