Variability of BL Lac objects at X-ray and other frequencies

Details Variability of BL Lac objects at X-ray and other frequencies Variability of BL Lac objects at X-ray and other frequencies

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..607p&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

9

Bl Lacertae Objects, Exosat Satellite, Infrared Astronomy, Variability, X Ray Astronomy, Electromagnetic Radiation, Luminosity, Red Shift, Satellite-Borne Instruments

Scientific paper

Exosat observations of five BL Lac objects were carried out to study variations in X-ray luminosity. Simultaneous infrared observations were obtained using the UK Infrared Telescope (UKIRT) although weather and technical problems limited the coverage. The Exosat and UKIRT data were combined with other measurements in the optical, UV, and radio frequencies in order to find the amplitude of the variations. The amplitude of the variations of the object having the best coverage, OJ287 (= 0851 + 202), was two times larger in the X-ray range than at other wavelengths. X-ray count rates obtained using the Lexan-filtered Exosat Multiplier Array (CMA) at 3000 A are reproduced in graphic form.

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