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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/007/03/0225-0236

    • Keywords

       

      Jets—relativistic beaming—quasars—3C 273—lobe expansion

    • Abstract

       

      New observations of the jet in 3C 273 support and refine our earlier interpretation that (i) the mapped jet is 106±0.3 yr old and grows at 0.6 to 0.75 times the speed of light, at an average angle θ of (20 ± 10)‡ with respect to the line of sight; (ii) its twin is not seen yet because arriving signals were emitted when it was some 100.6±0.2 times younger; (iii) the fluid moving in the jet is an extremely relativistice±-pair plasma, of bulk Lorentz factor γ >102; (iv) the beam has swung in projection through some 10‡; and (v) the small excursions (wiggles) of the jet around its average propagation direction result from a self-stabilizing interaction with the nonstatic ambient plasma. All other interpretations of which we are aware depend heavily on the (‘beaming’) assumption that the jet material radiates isotropically in some (comoving) Lorentz frame, an assumption which we consider unrealistic.

    • Author Affiliations

       

      Wolfgang Kundt1 Gopal-Krishna2

      1. Institut für Astrophysik der UniversitÄt, Auf dem Hügel 71, Bonn - D-5300, FRG
      2. Radio Astronomy Centre, Tata Institute of Fundamental Research, Post Box 1234, Bangalore - 560012
    • Dates

       
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