Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..296r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 296-301. Research supported by Georgia State Univers
Astronomy and Astrophysics
Astronomy
12
Bl Lacertae Objects, Light Speed, Radio Jets (Astronomy), Shock Wave Propagation, Astronomical Models, Elliptical Galaxies, Light Curve, Very Large Array (Vla)
Scientific paper
The combination of a helical filament found by VLA observations at kpc scales in the M87 jet by Hardee, Owen, and Cornwell (1989) with a shock propagating down a jet suggests a kinematical model that could explain much of the flux variation in sources where the jet is aligned almost directly toward the observer, such as BL Lacertae objects. This model also naturally generates a superluminal pattern speed. The assumptions made by a first-order approximate model are discussed. Reasonable values for jet opening angle, viewing angle, shock speed, and radiative particle speed are used to match the model both to flux variations and superluminal motion of BL Lacertae itself with reasonable success.
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