Kinematics of the parsec-scale jet in BL Lac

Details Kinematics of the parsec-scale jet in BL Lac Kinematics of the parsec-scale jet in BL Lac

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..641r&link_type=abstract

New Astronomy Reviews, Volume 47, Issue 6-7, p. 641-644.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

An analysis has been made of the three-dimensional trajectories of two components in the parsec-scale jet of BL Lac, constructed using centimetre-wavelength VLBI data at multiple epochs. The 3-D trajectory of each of these components has first been reconstructed assuming that they move with constant speeds.
The only plausible trajectories consistent with the observed paths make small angles to the line of sight (less than 15°) everywhere along their paths. The flux density variations predicted by variations in Doppler beaming do not agree with the component light curves. We suggest models involving expansion or deceleration in addition to changes in direction to account for the observed flux density changes.

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