SIMBAD references

2004MNRAS.351...83L - Mon. Not. R. Astron. Soc., 351, 83-100 (2004/June-2)

A physical classification scheme for blazars.


Abstract (from CDS):

Blazars are currently separated into BL Lacertae objects (BL Lacs) and flat spectrum radio quasars based on the strength of their emission lines. This is performed rather arbitrarily by defining a diagonal line in the Ca H&K break value-equivalent width plane, following Marchã et al. We readdress this problem and put the classification scheme for blazars on firm physical grounds. We study ∼100 blazars and radio galaxies from the Deep X-ray Radio Blazar Survey (DXRBS) and 2-Jy radio survey and find a significant bimodality for the narrow emission line [Oiii]λ5007. This suggests the presence of two physically distinct classes of radio-loud active galactic nuclei (AGN). We show that all radio-loud AGN, blazars and radio galaxies, can be effectively separated into weak- and strong-lined sources using the [Oiii]λ5007-[Oii]λ3727 equivalent width plane. This plane allows one to disentangle orientation effects from intrinsic variations in radio-loud AGN. Based on DXRBS, the strongly beamed sources of the new class of weak-lined radio-loud AGN are made up of BL Lacs at the ∼75 per cent level, whereas those of the strong-lined radio-loud AGN include mostly (∼97 per cent) quasars.

Abstract Copyright: 2004 RAS

Journal keyword(s): galaxies: active - BL Lacertae objects: general - quasars: emission lines

VizieR on-line data: <Available at CDS (J/MNRAS/351/83): table1.dat table2.dat table3.dat table4.dat>

CDS comments: p.97: 2Jy 1514+07 not identified

Simbad objects: 175

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