A study of BL Lacertae-type objects with Exosat. I - Flux correlations, luminosity variability, and spectral variability

Details A study of BL Lacertae-type objects with Exosat. I - Flux correlations, luminosity variability, and spectral variability A study of BL Lacertae-type objects with Exosat. I - Flux correlations, luminosity variability, and spectral variability

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..432g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 20, 1990, p. 432-455.

Astronomy and Astrophysics

Astrophysics

129

Astronomical Spectroscopy, Bl Lacertae Objects, Exosat Satellite, Luminosity, X Ray Sources, Absorption Spectra, Active Galactic Nuclei, Light Curve, Spectral Energy Distribution, Synchrotron Radiation

Scientific paper

Results are presented on a systematic analysis of more than 200 X-ray observations on 36 BL Lac objects, obtained from the Exosat archive, providing further strong evidence that the population of currently known BL Lac objects can be divided into two subclasses, Q-BL Lacs and X-BL Lacs. The subclass Q-BL Lacs includes most of the classical radio-discovered BL objects which are characterized by a continuum energy distribution, from radio to X-rays, similar to that of flat-radio-spectrum QSOs, highly polarized quasars, and optically violent variable QSOs. The subclass X-BL Lacs includes all the BL Lac objects which were detected in high-frequency surveys (i.e., optical and X-ray). This subclass is characterized by a very smooth energy distribution from radio to X-rays, which is often considered to be the signature of synchrotron emission.

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