On the relationship between BL Lacertae objects and radio galaxies

Abstract

We present deep radio images at 1.4 GHz of a large and complete sample of BL Lacertae objects (BL Lacs) selected from the Deep X-ray Radio Blazar Survey (DXRBS). We have observed 24 northern sources with the Very Large Array (VLA) in both its A and C configurations and 15 southern sources with the Australia Telescope Compact Array (ATCA) in its largest configuration. We find that in the DXRBS, as in the 1-Jy survey, which has a radio flux limit roughly ten times higher than the DXRBS, a considerable number (about a third) of BL Lacs can be identified with the relativistically beamed counterparts of Fanaroff-Riley type II (FR II) radio galaxies. We attribute the existence of FR II-BL Lacs, which is not accounted for by current unified schemes, to an inconsistency in our classification scheme for radio-loud active galactic nuclei (AGN). Taking the extended radio power as a suitable measure of intrinsic jet power, we find similar average values for low- (LBL) and high-energy peaked BL Lacs (HBL), contrary to the predictions of the blazar sequence.

21 pages, 10 figures, accepted by MNRAS

References in corpus (21)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• A Unifying View of the Spectral Energy Distributions of Blazars
• A theoretical unifying scheme for gamma-ray bright blazars
• The Connection between X-ray- and Radio-Selected BL Lacertae Objects
• The HST Survey of BL Lacertae Objects. II. Host Galaxies
• The Jet-Disk Connection and Blazar Unification
• The Deep X-ray Radio Blazar Survey (DXRBS). I. Methods and First Results
• The Properties of the Radio-Selected 1Jy Sample of BL Lacertae Objects
• The Properties of the X-Ray-Selected EMSS Sample of BL Lac Objects
• The Deep X-Ray Radio Blazar Survey (DXRBS). III. Radio Number Counts, Evolutionary Properties, and Luminosity Function of Blazars
• FIRST `Winged' and `X'-shaped Radio Source Candidates
• The ROSAT X-ray Spectra of BL Lacertae Objects
• The Deep X-ray Radio Blazar Survey (DXRBS). II. New Identifications
• The Blazar Sequence: Validity and Predictions
• Extended radio emission in BL Lac objects - I: the images
• A Sample of Low Redshift BL Lacs. I. The Radio Data
• The classification of BL Lacertae objects: the Ca H&K break
• A Viewing Angle - Kinetic Luminosity Unification Scheme For BL Lacertae Objects
• A Physical Classification Scheme for Blazars
• The Sedentary Survey of Extreme High Energy Peaked BL Lacs III. Results from Optical Spectroscopy
• VLA Observations of a New Population of Blazars

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