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Outflow Angles and Bulk Lorentz Factors for Different Categories of AGN

Published online by Cambridge University Press:  12 April 2016

Erick. J. Guerra  and
Ruth A. Daly
Erick. J. Guerra
Affiliation:
Department of Physics, Princeton University, Princeton NJ, 08544
Ruth A. Daly
Affiliation:
Department of Physics, Princeton University, Princeton NJ, 08544

Abstract

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Relativistic outflows from AGN can be parameterized by θ, the angle subtended by the direction of the outflow and the line of sight to the observer, and γ, the bulk Lorentz factor of the outflow. The Doppler factor, δ, and the apparent speed in the plane of the sky, βapp, are combinations of θ and γ. The Doppler factor can be estimated using either the equipartition Doppler factor, δeq (Readhead 1994), or the inverse Compton Doppler factor, δIC. These Doppler factor estimates are combined with observed βapp to solve for θ and γ for different categories of AGN.

Ghisellini et al. (1993) compute δIC for 105 compact radio sources, and Güijosa & Daly (1996) compute δeq for the same sample. Daly, Guerra, & Güijosa (1996) estimate θ and γ for the 43 sources that have βapp listed by Vermeulen & Cohen (1994) and δeq computed by Güijosa & Daly (1996).

Solutions and errors for θ and γ are presented in Figures 1 and 2 using δeq and δIC respectively. Guerra & Daly (1996) discuss these estimates and errors in greater detail. These AGN fall into the following categories: BL Lacertae objects (BL Lacs), core-dominated high-polarization quasars (CDHPQ), core-dominated low-polarization quasars (CDLPQ), core-dominated quasars with no polarization information (CDQ(NPI)), lobe-dominated quasars (LDQ), and radio galaxies (RG).

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 695 - 696
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

Daly, R.A., Guerra, E.J., & Guijosa, A. 1996, in “Energy Transport in Radio Galaxies and Quasars”, eds. Hardee, P., Bridle, A., & Zensus, J. (San Francisco: ASP conf. series), 73 Google Scholar
Ghisellini, G., Padovani, P., Celotti, A., & Maraschi, L. 1993, ApJ, 407, 65 CrossRefGoogle Scholar
Guerra, E.J. & Daly, R.A. 1996, ApJ, submittedGoogle Scholar
Guijosa, A. & Daly, R.A. 1996, ApJ, 461, 600 Google Scholar
Readhead, A.C.S. 1994, ApJ, 426, 51 CrossRefGoogle Scholar
Vermeulen, R.C. & Cohen, M.H. 1994, ApJ, 430, 467 CrossRefGoogle Scholar