Independent Estimate of the Doppler Factor and the Bulk Lorentz Factor in Large-Scale X-ray Jets

Details Independent Estimate of the Doppler Factor and the Bulk Lorentz Factor in Large-Scale X-ray Jets Independent Estimate of the Doppler Factor and the Bulk Lorentz Factor in Large-Scale X-ray Jets

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6401s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #64.01; Bulletin of the American Astronomical Society, Vol. 39, p.854

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Scientific paper

The apparent lack of a simple mechanism to explain the 100-kpc scale X-ray emission from powerful radio quasars is resolved if one assumes the X-ray emission is due to inverse Compton scattering on the cosmic microwave background. This is now commonly assumed to interpret such X-ray jets. However, for the radio emission to be emitted by an extension of the electron spectrum responsible for the X-rays, and in a region of near equipartition, requires that the jet be in bulk
relativistic motion and aligned at a small angle to the line of sight. To interpret the physical quantities in the jet rest frame, on the other hand, depends on transforming the radiation we observe by some power of the bulk relativistic Doppler factor, δ = 1/[Γ(1-β cosθ)]. Since generally we do not have any independent information on the angle to the line of sight, θ,one usually assumes that the bulk Lorentz factor Γ=δ. We consider an alternate assumption: that the kinetic flux is constant along the jet. We show the case of PKS 1055+201, where this analysis decreases the inferred Doppler factors and increases the inferred magnetic fields, Lorentz factors, and angles to the line of sight. For example, bulk Lorentz factors which ranged from 3 to 4.5, now span values of 4 to 6 for various regions of the jet.

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