X-ray/optical brightness trends in 3C 66A

Details X-ray/optical brightness trends in 3C 66A X-ray/optical brightness trends in 3C 66A

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178...21m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 21-24.

Astronomy and Astrophysics

Astrophysics

18

Bl Lacertae Objects, Brightness Distribution, X Ray Sources, Exosat Satellite, Heao 2, Secular Variations, Visible Spectrum, X Ray Spectra

Scientific paper

New X-ray and optical observations of the BL Lac object 3C 66A show small amplitude (≡30%) variability occurring probably contemporaneously in both ranges. The time scale is of the order of a week. This indicates that small intensity variations engage the whole electromagnetic spectrum of the source between visible and X-ray wavelengths, while large outbursts are mainly confined in the X-ray band. No evidence is found for a steep X-ray spectrum at times of low intensity levels, as had been previously found, hinting to a different physical process in the source at times of large X-ray outbursts.

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