Multifrequency observations of active galactic nuclei

Details Multifrequency observations of active galactic nuclei Multifrequency observations of active galactic nuclei

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..111t&link_type=abstract

In ESA Fourth European IUE Conf. p 111-117 (SEE N84-35135 24-88)

Astronomy and Astrophysics

Astronomy

9

Active Galactic Nuclei, Bl Lacertae Objects, Seyfert Galaxies, Exosat Satellite, Iue, Ultraviolet Astronomy, X Ray Astronomy

Scientific paper

Active Galactic Nuclei were observed simultaneously with EXOSAT, IUE and ground based telescopes in order to determine the overall energy distribution over a wide frequency range. Repeated observations of highly variable objects were used to study correlated variability in different spectral domains. Analyses of repeated observations of the BL Lac object PKS 2155-304 and of the Seyfert Galaxies 3C 120 and MGC 8-11-11 are described. For PKS 2155-304 the soft X ray flux increases by a factor of 5 within a month while a corresponding brightening of 30% is observed in the UV. In 3C 120 a variation of a factor of 2 is observed in the UV on time scales of months, while no simultaneous variation in the X rays is apparent; MGC 8-11-11, steady in the UV, shows a substantial variation in soft X rays, possibly due to variation of the intrinsic absorption cut off.

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