The X-ray and optical variability of the BLRG 3C390.3

Details The X-ray and optical variability of the BLRG 3C390.3 The X-ray and optical variability of the BLRG 3C390.3

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..637s&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

H Alpha Line, H Beta Line, Optical Emission Spectroscopy, Radio Galaxies, Variability, X Ray Astronomy, Emission Spectra, Exosat Satellite, Light (Visible Radiation), Seyfert Galaxies

Scientific paper

The X-ray and optical spectra of the double-lobed radio galaxy 3C390.3 are examined with reference to recent Exosat observations. It is shown that the optical continuum, as quantified by the B magnitude, has decreased by about 2 magnitudes over the last 10-15 years. The H-alpha emission has decreased in intensity to a far lesser degree than both the continuum and the broad H-beta line. An analysis of the available data suggests that 3C390.3 is now a radio galaxy equivalent to the Seyfert type 1.9. The Exosat observations also confirm a long-term decrease in X-ray flux, however, the most recent Exosat observation shows a significant increase in X-rays over the measurement of about 3 months earlier. The nature of this increase is not yet clear.

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