Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...568l..81d&link_type=abstract
The Astrophysical Journal, Volume 568, Issue 2, pp. L81-L84.
Astronomy and Astrophysics
Astronomy
62
Galaxies: Active, Galaxies: Jets, Gamma Rays: Theory, Radiation Mechanisms: Nonthermal, X-Rays: Galaxies
Scientific paper
Chandra observations of knots and hot spots in spatially resolved X-ray jets of radio galaxies show that the X-ray fluxes often lie above an extrapolation from the radio-to-optical continuum fluxes. We show that combined synchrotron and Compton losses on a single-power-law electron injection function can produce a hardening in the electron spectrum at electron Lorentz factors of γ~2×108/[Γ(1+z)] owing to Klein-Nishina energy losses on the cosmic microwave background radiation. Here Γ is the bulk Lorentz factor of the outflow and z is the source redshift. This produces a flattening in the spectrum at frequencies of >~8×1016δBμG/[Γ2(1+z)3] Hz, where BμG is the magnetic field in the comoving plasma frame in units of microgauss and δ is the Doppler factor. A single population of synchrotron-emitting electrons may therefore produce the radio-to-X-ray continuum in some radio galaxy knots, such as those in 3C 273.
Atoyan Armen M.
Dermer Charles D.
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