Modeling X-Ray Emission of a Straight Jet: PKS 0920-397

D. A. Schwartz*, F. Massaro, A. Siemiginowska, D. M. Worrall, M. Birkinshaw, H. Marshall, D. Evans, E. Perlman, J. M. Gelbord, J. E. J. Lovell, L. Godfrey, G. Bicknell, R. Ojha, M. Hardcastle, S. Jester, S. Jorstad, L. Stawarz

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)


We summarize a study of PKS 0920-397 using our 42 ks Chandra observation in conjunction with our ATCA 20GHz image, and HST/ACS F814W and F475W images. We investigate the hypothesis that the jet X-ray emission is due to inverse-Compton ( IC) scattering on the cosmic microwave background (CMB) from the same population of relativistic electrons that give rise to the radio emission. To calculate parameters intrinsic to the source, one must finesse the fact that we do not know the true angle of the jet to our line of sight. Typical assumptions are that the Doppler factor equals the bulk Lorentz factor, or that the Lorentz factor takes some fixed numerical value. While giving useful estimates, neither assumption can be exact in general. We try different constraints to determine the jet quantities. It is plausible that the kinetic flux is constant along the jet, prior to a terminal hotspot or lobe, and with minimal bending of the jet. Alternatively, because PKS 0920-397 appears straight in projection on the sky, we might assume the jet maintains a constant angle to our line of sight. Either approach gives bulk Lorentz factors of 6 to 8, with kinetic energy flux of order 1046 erg s(-1), and with the jet at an angle 2 degrees to 4 degrees from our line of sight.

Original languageEnglish
Pages (from-to)879-885
Number of pages7
JournalInternational Journal of Modern Physics D
Issue number6
Publication statusPublished - Jun 2010
EventInternational Meeting on High-Energy Phenomena in Relativistic Outflows II - Burnod Aires, Argentina
Duration: 26 Oct 200930 Oct 2009


  • Quasar jets
  • X-ray jets
  • jet emission mechanisms


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