New Chandra observations of the jet in 3C273. 1. Softer X-ray than radio spectra and the X-ray emission mechanism

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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 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 ... continued below

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11 pages

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Jester, Sebastian; /Fermilab; Harris, D.E.; Observ., /Smithsonian Astrophys.; Marshall, H.L.; /MIT, MKI et al. May 1, 2006.

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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 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.

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11 pages

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  • Journal Name: Astrophys.J.648:900-909,2006; Journal Volume: 648

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  • Report No.: FERMILAB-PUB-06-049-CD
  • Grant Number: AC02-76CH03000
  • DOI: 10.1086/505962 | External Link
  • Office of Scientific & Technical Information Report Number: 892263
  • Archival Resource Key: ark:/67531/metadc873627

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  • May 1, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 2:03 p.m.

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Jester, Sebastian; /Fermilab; Harris, D.E.; Observ., /Smithsonian Astrophys.; Marshall, H.L.; /MIT, MKI et al. New Chandra observations of the jet in 3C273. 1. Softer X-ray than radio spectra and the X-ray emission mechanism, article, May 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc873627/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.