Optical and radio properties of X-ray selected BL Lacertae objects

Details Optical and radio properties of X-ray selected BL Lacertae objects Optical and radio properties of X-ray selected BL Lacertae objects

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..619s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 619-629. CNR-supported research.

Astronomy and Astrophysics

Astronomy

130

Bl Lacertae Objects, Galactic Nuclei, X Ray Sources, Active Galactic Nuclei, Astronomical Photometry, Galactic Clusters, Heao 1, Polarimetry, Radio Astronomy, Sky Surveys (Astronomy), Visible Spectrum

Scientific paper

The eight BL Lac objects from the HEAO 1 A-2 all-sky survey and from the Einstein medium-sensitivity survey (MSS) form a flux-limited complete X-ray selected sample. The optical and radio properties of the MSS BL Lac objects are presented and compared with those of the HEAO 1 A-2 sample and with those of radio-selected BL Lac objects. The X-ray selected BL Lac objects possess smaller polarized fractions and less violent optical variability than radio-selected BL Lac objects. These properties are consistent with the substantial starlight fraction seen in the optical spectra of a majority of these objects. This starlight allows a determination of definite redshifts for two of four MSS BL Lac objects and a probable redshift for a third. These redshifts are 0.2, 0.3, and 0.6. Despite the differences in characteristics between the X-ray selected and radio-selected samples, it is concluded that these eight objects possess most of the basic qualities of BL Lac objects and should be considered members of that class. Moreover, as a class, these X-ray selected objects have the largest ratio of X-ray to optical flux of any active galactic nuclei yet discovered.

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