Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11003a&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
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. This suggests that either two distinct radiation components or separate populations of synchrotron-emitting electrons are required to model the emission. We show that combined synchrotron and Compton losses on a single power-law electron injection function can produce a kink in the electron spectrum at electron Lorentz factors γ ≈ 2× 10^8/Γ(1+z) due to KN 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 > ~8× 10^16 δ B_μG/[Γ^2(1+z)^3] Hz, where B_μG is the magnetic field in the comoving plasma frame in units of micro-Gauss, 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
Dermer Charles
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