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Title:
The complete sample of 1 Jansky BL Lacertae objects. I - Summary properties
Authors:
Stickel, M.; Padovani, P.; Urry, C. M.; Fried, J. W.; Kuehr, H.
Affiliation:
AA(Max-Planck-Institut für Astronomie, Heidelberg, Germany), AB(Space Telescope Science Institute, Baltimore, MD), AC(Space Telescope Science Institute, Baltimore, MD), AD(Max-Planck-Institut für Astronomie, Heidelberg, Germany), AE(Max-Planck-Institut für Astronomie, Heidelberg, Germany)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 20, 1991, p. 431-439. (ApJ Homepage)
Publication Date:
06/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Bl Lacertae Objects, Emission Spectra, Gravitational Lenses, Radio Sources (Astronomy), Sky Surveys (Astronomy), Brightness Distribution, Galactic Radiation, Red Shift
DOI:
10.1086/170133
Bibliographic Code:
1991ApJ...374..431S

Abstract

The first well-defined, homogeneous radio sample of 34 BL Lac objects selected from a large-area survey of sources brighter than 1 Jy at 5 GHz is presented. Extensive optical spectroscopy reveals weak emission lines in roughly 3/4 of the 34 BL Lac objects in the sample. Optical imaging reveals that the nearby BL Lac objects are not stellar, and that the surface brightness distribution of the surrounding fuzz is consistent with the host galaxies being bright ellipticals. The results suggest that gravitational lensing may affect three of the 17 high-redshift BL Lac objects in the sample. The observations do not support a microlensing scenario for the low-redshift objects.

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