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| Paper: |
Variability and Velocity of Superluminal Sources |
| Volume: |
300, Radio Astronomy at the Fringe |
| Page: |
177 |
| Authors: |
Cohen, M.H.; Russo, M.A.; Homan, D.C.; Kellermann, K.I.; Lister, M.L.; Vermeulen, R.C.; Ros, E.; Zensus, J.A. |
| Abstract: |
We investigate the relation between the Doppler factor determined from variations in total flux at
22 and 37 GHz, and the apparent transverse velocity determined from VLBA observations at 2
cm. The data are consistent with the relativistic beaming theory for compact radio sources, in that
the distribution of βapp/δvar, for 30 quasars, is roughly consistent with a Monte Carlo simulation.
The intrinsic temperature appears to be ~ 2 × 1010 K, close to the “equipartition value”
calculated by Readhead (1994). We deduce the distribution of Lorentz factors for a group of 48
sources; the values range up to about γ = 40. |
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