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The radio to X-ray continuum emission of the quasar 3C273 and its temporal variations

By T. J. L. Courvoisier, M. J. L. Turner, E. I. Robson, Walter Kieran Gear, R. Staubert, R. Blecha, P. Bouchet, R. Falomo, M. Valtonen and H. Terasranta

Abstract

Quasi-simultaneous multifrequency observations from radio to X-rays of the bright quasar 3C273 for several epochs between December 1983 and March 1986 are presented. The light curves in the different wavebands and the overall spectral energy distribution are analyzed. The NIR and optical fluxes showed small variations during the period considered, whereas the hard X-ray flux decreased by a factor of about 2 at the beginning of 1984, remained low during 1984-1985, and increased again by about 40 percent at the beginning of 1986. The soft X-ray flux varied several times by 20-40 percent, with no apparent underlying trend. In the submillimeter region, the flux remained constant during 1984, decreased in 1985, and again in 1986 to reach its lowest known level. The variations occurred at different epochs in the different wavebands, requiring the presence of different, although possibly related, emission components dominating the flux in the different spectral regions

Topics: QB
Publisher: EDP Sciences
Year: 1987
OAI identifier: oai:http://orca.cf.ac.uk:36364
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