Cohen, Marshall H. (1989) Statistics of superluminal sources. In: BL Lac Objects. Lecture Notes in Physics. No.334. Springer-Verlag , Berlin/Heidelberg, pp. 13-21. ISBN 978-3-540-51389-6. https://resolver.caltech.edu/CaltechAUTHORS:20201008-131242874
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Abstract
The probability density that a randomly selected beamed source lies at angle θ to the line of sight is shown in Fig. 3. For reasonable values of the Lorentz factor, the Doppler boost exponent and the N(S) exponent, p(θ) peaks at a few degrees, well inside the angle for maximum apparent transverse velocity. Theoretical distributions of the apparent transverse velocity are sharply peaked near the maximum possible value, but the observed distribution is peaked at low velocities. Some of the difference is due to the inhomogeneous nature of the sample. BL Lacs have a lower average velocity than quasars. From a purely statistical point of view this might be due to their being the low-θ tail of the quasar distribution; this also would help to explain the rapid intensity variations and high continuum/line ratios. However this explanation is unlikely, because the redshift distributions are so different.
| Item Type: | Book Section | |||||||||
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| Additional Information: | © Springer-Verlag 1989. I am grateful to the Lick Observatory, where some of this work was done, and to Tim Pearson for helpful comments. This work was supported by NSF Grant AST 85-09822. | |||||||||
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| Subject Keywords: | Proper Motion; Lorentz Factor; Virgo Cluster; Redshift Distribution; Doppler Factor | |||||||||
| Series Name: | Lecture Notes in Physics | |||||||||
| Issue or Number: | 334 | |||||||||
| DOI: | 10.1007/bfb0031139 | |||||||||
| Record Number: | CaltechAUTHORS:20201008-131242874 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20201008-131242874 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 105941 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 08 Oct 2020 20:23 | |||||||||
| Last Modified: | 16 Nov 2021 18:48 |
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