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4 Years of Radio to X-ray Observations of 3C 273

Published online by Cambridge University Press:  07 August 2017

T.J.-L. Courvoisier ,
E. I. Robson ,
A. Blecha  and
P. Bouchet
T.J.-L. Courvoisier
Affiliation:
Geneva Observatory, CH-1290 Sauverny, Switzerland
E. I. Robson
Affiliation:
School of Physics and Astronomy, Lancashire Polytechnic, Preston PR1 2TQ, UK
A. Blecha
Affiliation:
Geneva Observatory, CH-1290 Sauverny, Switzerland
P. Bouchet
Affiliation:
ESO, Casilla 19001, Santiago 19, Chile

Extract

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The quasar 3C273 has been repeatedly observed at radio, mm, IR, optical, UV and X-ray frequencies since December 1983. A complex pattern of continuum variations has been discovered, which can be used to provide model independent physical parameters, and to constrain different models. The main features revealed by our set of observations are:

  1. (i) A flux decrease by 40% in the 2–10 kev flux in 20 days in early 1984 (Courvoisier et al. 1987).

  2. (ii) Differences between the X-ray light curves at 0.5 keV and 2–10 keV.

  3. (iii) A drop in the mm to mid-IR emission by factors 2–4 in early 1986, while the near infrared flux remained stable (Robson et al. 1986).

  4. (iv) A decrease in the ultraviolet intensity of ∼40% in about 6 months in 1987 (Ulrich, Courvoisier and Wamsteker 1988).

  5. (v) Rapid variability in the infrared and optical emission on timescales as short as one day in 1988 (Courvoisier et al. 1988 and Robson, Courvoisier and Bouchet this conference).

Type
Part 2: BLR and Variability
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 112 - 113
Copyright
Copyright © Kluwer 1989 

References

Camenzind, M. and Courvoisier, T.J.-L., 1983, Ap.J. 266, L83.CrossRefGoogle Scholar
Courvoisier, T.J.-L. et al., 1987, A.&A. 176, 197.Google Scholar
Courvoisier, T.J.-L. et al., 1988, Submitted to Nature. Google Scholar
Robson, E.I. et al., 1986, Nature, 323, 134.CrossRefGoogle Scholar
Robson, E.I., Courvoisier, T.J.-L. and Bouchet, P., 1988, this volume.Google Scholar
Svenson, R., 1984, MPE report 134, p. 152, Brinkmann, W. and Truemper, J. eds.Google Scholar
Ulrich, M.-H., Courvoisier, T.J.-L. and Wamsteker, W., 1988, A.&A. in press.Google Scholar