Correlation between Eddington Ratios and Broad-Line Luminosities in Flat-Spectrum Radio Quasars, BL Lacertae Objects, and Radio Galaxies

2007 ◽  
Vol 133 (5) ◽  
pp. 2187-2191 ◽  
Author(s):  
H. Dai ◽  
G. Z. Xie ◽  
S. B. Zhou ◽  
H. Z. Li ◽  
L. E. Chen ◽  
...  
Keyword(s):  
Radio Galaxies ◽  
Broad Line ◽  
Bl Lacertae Objects ◽  
Bl Lacertae ◽  
Spectrum Radio

scholarly journals Outflow Angles and Bulk Lorentz Factors for Different Categories of AGN

1997 ◽  
Vol 163 ◽  
pp. 695-696 ◽  
Author(s):  
Erick. J. Guerra ◽  
Ruth A. Daly
Keyword(s):  
Lorentz Factor ◽  
Radio Galaxies ◽  
Line Of Sight ◽  
Radio Sources ◽  
Bl Lacertae Objects ◽  
Bl Lacertae ◽  
High Polarization ◽  
Inverse Compton ◽  
Doppler Factor ◽  
Bl Lacs

AbstractRelativistic 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).

scholarly journals Doppler factors, Lorentz factors, and viewing angles for quasars, BL Lacertae objects and radio galaxies

2009 ◽  
Vol 498 (3) ◽  
pp. 723-723 ◽  
Author(s):  
T. Hovatta ◽  
E. Valtaoja ◽  
M. Tornikoski ◽  
A. Lähteenmäki
Keyword(s):  
Radio Galaxies ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

scholarly journals The De-beamed γ-Ray Emissions in Blazars

2013 ◽  
Vol 9 (S304) ◽  
pp. 159-160 ◽  
Author(s):  
J. H. Fan ◽  
Z. Y. Ji
Keyword(s):  
Flux Density ◽  
Strong Correlations ◽  
Bl Lacertae Objects ◽  
Present Sample ◽  
Bl Lacertae ◽  
Spectrum Radio ◽  
Γ Ray

AbstractBlazars (BL Lacertae objects and flat spectrum radio quasars) are strong γ-ray emitters, the γ-ray emissions are strongly beamed. In this work, we compiled a sample of Fermi blazars with available beaming factors, δR, to investigate the correlation between the γ-ray flux density, logfγ, and redshift, logz for the whole sample and the subclasses of the present sample. The analysis shows that there is no correlation between logfγ and logz for the observed γ-ray flux density, but there are strong correlations between the de-beamed flux densities, logfγdb and logz for the whole sample and the subclasses. Our results confirm that the γ-ray emissions are strongly beamed and imply that it is possible for one to use the radio beaming factor, δR for the beaming effect discussions in the γ-ray bands for Fermi blazars.

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