Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..255w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 255-264.
Astronomy and Astrophysics
Astronomy
18
Light Curve, Quasars, Radio Jets (Astronomy), Spectral Bands, Ultraviolet Emission, X Ray Astronomy, Active Galactic Nuclei, Active Galaxies, Exosat Satellite, Seyfert Galaxies
Scientific paper
We present an analysis of simultaneous X-ray and ultraviolet observations of the two quasars, 3C 273 and 3C 120, which exhibit very similar multiwaveband spectra. This investigation is limited to the long term variations observed in the two spectral bands and to their correlations. In both objects, the X-ray and ultraviolet lightcurves are not coupled and the X-ray spectral slope is not coupled with either of them. However we have obtained an excellent anticorrelation between the slope of the X-ray power law and the logarithm of the ratio of the X-ray to ultraviolet fluxes in both objects. These anticorrelations cannot be spurious as the contribution of the X-ray power law in the ultraviolet band is negligible. These relations are a strong support for inverse Comptonization models where hot electrons scatter seed ultraviolet photons. The slopes of the observed anticorrelation give an electronic temperature of the order of m(e)c-squared/kB. Two X-ray flares do not fit the anticorrelation found in 3C 273. Both appeared a few months before the infrared-optical flares observed in this object. We interpret them as the signatures of the birth of new knots in the radio jet.
Courvoisier Thierry J. -L.
Walter Robert
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