Outflow angles, bulk lorentz factors, and kinematics of outflows from the cores of active galactic nuclei

Erick J. Guerra, Ruth A. Daly

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Outflow angles and bulk Lorentz factors for 43 sources that have proper motions (compiled by Vermeulen and Cohen in 1994) are computed on the basis of Doppler factors and observed apparent motions in the plane of the sky. These estimates of outflow angles and bulk Lorentz factors are discussed along with their agreement with orientation unified models of active galactic nuclei. Intrinsic (i.e., rest frame) brightness temperatures computed by using the inverse Compton and equipartition Doppler factors are discussed along with their relevance to the "inverse Compton catastrophe." Intrinsic luminosity densities and luminosities are presented, and the role of systematic errors is discussed. These studies are carried out using a sample of 100 compact radio sources that was compiled by Ghisellini and coworkers in 1993. Error estimates for previously computed inverse Compton Doppler factors and equipartition Doppler factors are presented for these sources, along with a few updates of these Doppler factor estimates.

Original languageEnglish (US)
Pages (from-to)483-500
Number of pages18
JournalAstrophysical Journal
Volume491
Issue number2 PART I
DOIs
StatePublished - Jan 1 1997

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active galactic nuclei
outflow
kinematics
brightness temperature
radio
estimates
luminosity
proper motion
systematic errors
sky
catastrophe

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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abstract = "Outflow angles and bulk Lorentz factors for 43 sources that have proper motions (compiled by Vermeulen and Cohen in 1994) are computed on the basis of Doppler factors and observed apparent motions in the plane of the sky. These estimates of outflow angles and bulk Lorentz factors are discussed along with their agreement with orientation unified models of active galactic nuclei. Intrinsic (i.e., rest frame) brightness temperatures computed by using the inverse Compton and equipartition Doppler factors are discussed along with their relevance to the {"}inverse Compton catastrophe.{"} Intrinsic luminosity densities and luminosities are presented, and the role of systematic errors is discussed. These studies are carried out using a sample of 100 compact radio sources that was compiled by Ghisellini and coworkers in 1993. Error estimates for previously computed inverse Compton Doppler factors and equipartition Doppler factors are presented for these sources, along with a few updates of these Doppler factor estimates.",
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Outflow angles, bulk lorentz factors, and kinematics of outflows from the cores of active galactic nuclei. / Guerra, Erick J.; Daly, Ruth A.

In: Astrophysical Journal, Vol. 491, No. 2 PART I, 01.01.1997, p. 483-500.

Research output: Contribution to journalArticle

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