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Multifrequency Variability of AGN's: Continuum Variations from the Near IR to the X-rays

Published online by Cambridge University Press:  19 July 2016

J. Clavel
J. Clavel*
Affiliation:
ESA, ESTEC/SAI Postbus 299 2200-AG Noordwijk, The Netherlands

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Because they emit copiously over more than 10 decades in frequency, Active Galactic Nuclei (AGN) cannot be understood without the help of multiwavelength observations. On the other hand, variability monitoring has also proven to be invaluable in understanding the continuum and line emission process as well as the geometry of the innermost regions in these objects. Indeed, at the heart of AGN's lies an object which is so compact that the only way to probe its structure is the study of the temporal evolution of its spectrum. The equivalent resolution which can be achieved in this way is of the order of 10 microarcsecs, far beyond the capability of any UV or optical telescope.

Type
Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 131 - 143
Copyright
Copyright © Kluwer 1994 

References

Antonucci, R.R.J. & Miller, J.S. 1985: Ap. J. 297, 621 CrossRefGoogle Scholar
Antonucci, R.R.J., Kinney, A.L. & Ford, H.C.: 1989, Ap. J. 342, 64.Google Scholar
Antonucci, R.R.J. Kinney, A.L. & Hurt, T. 1993: Ap. J. 414, 506.Google Scholar
Avni, Y. & Tananbaum, H. 1986: Ap. J. 305, 83.Google Scholar
Baribaud, T. et al 1992: A & A 256, 375.Google Scholar
Barvainis, R. 1992: Ap.J . 400, 502.CrossRefGoogle Scholar
Barvainis, R. 1993: Ap. J. 412, 513.Google Scholar
Bromage, G. et al. 1985: M.N.R.A.Sv 215, 1.CrossRefGoogle Scholar
Cameron, R.A., et al. 1993: in “Compton Gamma Ray Observatory”, AIP Proceedings 280 , ed. Friedlander, M., Gehrels, N., & Macomb, D.J. (New-York: AIP), 559.Google Scholar
Clavel, J., Wamsteker, W. & Glass, I. 1989: Ap. J. 337, 236.Google Scholar
Clavel, J., et al 1990: M.N.R.A.S. 246, 668.Google Scholar
Clavel, J., et al 1991: Ap. J. 366, 64.Google Scholar
Clavel, J., et al 1990: Ap. J. 393, 113.CrossRefGoogle Scholar
Courvoisier, T.J.-L., et al. 1990: A & A 234, 73.Google Scholar
Courvoisier, T.J.-L. & Clavel, J.: 1991, A & A 248, 389.Google Scholar
Ferland, G.J., Korista, K.T. & Peterson, B.M. 1990: ApJ. 363, L21 Google Scholar
Georges, I.M., Fabian, A.C. 1990: M.N.R.A.S. 249, 352.Google Scholar
Glass, I.S. 1992: M.N.R.A.S. 256, 23P.Google Scholar
Jakobsen, P. et al 1993: Ap. J. , in press.Google Scholar
Jourdain, E., et al 1992: A & A. 256, L38.Google Scholar
Kinney, A.L. et al 1991: Ap. J. Suppl. 75, 645.Google Scholar
Koratkar, A.P., Kinney, A.L. & Bohlin, R.C.: 1992, Ap. J. 400, 435.Google Scholar
Krolik, J.H. & Begelman, M.C. 1986: Ap. J. 308, L55.Google Scholar
Lyons, R.W. et al 1993: Ap. J. , in press.Google Scholar
Lynden-Bell, J: 1969, Nature 223, 690.Google Scholar
Maisack, M., et al 1993: in “Compton Gamma Ray Observatory”, AIP Proceedings 280 , ed. Friedlander, M., Gehrels, N., & Macomb, D.J. (New-York: AIP), 493.Google Scholar
Malkan, M.A.: 1991, in Structure and properties of Accretion Disk , ed. Bertout, C. et al (Paris: Editions Frontieres), p. 165.Google Scholar
Maoz, D., et al. 1993: Ap. J. , in press.Google Scholar
Maraschi, L.: 1993, These Proceedings. Google Scholar
Morini, M., et al 1986: Ap. J. 307, 486.Google Scholar
Nandra, K., et al 1991a: in Iron Line Diagnostics in X-ray sources , ed. Treves, A., Perola, G.C. & Stella, L. (Berlin: Springer), 177.CrossRefGoogle Scholar
Nandra, K., et al 1991b: M.N.R.A.S. 248, 760.Google Scholar
Perola, G.C, et al 1986: Ap. J. 306, 508.Google Scholar
Peterson, B.M. et al 1991: Ap. J. 368, 119.Google Scholar
Peterson, B.M.: 1993, P.A.S.P. 105, 247.CrossRefGoogle Scholar
Pounds, K., et al 1990: Nature 344, 132.Google Scholar
Reichert, G.A., et al 1993: Ap. J. , in press.Google Scholar
Reimers, D. et al 1989: A & A 1989, 218.Google Scholar
Rokaki, E., Boisson, C., Collin, S.: 1992, A & A 253, 57.Google Scholar
Rudy, R.J. & Puetter, R.C. 1982: Ap. J. 263, 43.Google Scholar
Santos-Lleo, M., et al 1993: M.N.R.A.S. , in press.Google Scholar
Shakura, N.I, and Sunyaev, R.A.: 1973, A & A 24, 337.Google Scholar
Shields, G.A.: 1978, Nature , 272, 706.Google Scholar
Sitko, M. 1991: in Variability of Active Galactic Nuclei , ed. Miller, H.R. & Wiita, P.J. (Cambridge: Cambridge University Press), p.104 Google Scholar
Stirpe, G.M., et al 1993: Ap. J. , in press.Google Scholar
Williams, O.R., et al. 1992: Ap. J. 389, 157.Google Scholar