On the relationship between BL Lacertae objects and radio galaxies.

Landt, H.; Bignall, H.E.

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 (δ≳− 30°) 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 10 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. 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.

Citation

Landt, H., & Bignall, H. (2008). On the relationship between BL Lacertae objects and radio galaxies. Monthly Notices of the Royal Astronomical Society, 391(2), 967-985. https://doi.org/10.1111/j.1365-2966.2008.13967.x

• Journal Article Type: Article
• Publication Date: 2008-12
• Deposit Date: Jan 31, 2013
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 391
• Issue: 2
• Pages: 967-985
• DOI: https://doi.org/10.1111/j.1365-2966.2008.13967.x