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Variability in the Millimeter and Radio Domains

Published online by Cambridge University Press:  19 July 2016

Esko Valtaoja
Esko Valtaoja*
Affiliation:
Metsähovi Radio Research Station, Helsinki University of Technology, SF-02540 Kylmälä, Finland

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The radio domain spans only a small fraction of the total electromagnetic spectrum, and is for most active galaxies energetically insignificant in comparison with higher frequencies. However, only in the radio regime can we obtain continuous fluxcurves and be certain that we are not missing anything. We also believe we know where the radiation comes from, and by which mechanisms it is produced. Furthermore, since VLBI generally cannot resolve the smallest core components, multifrequency continuum monitoring remains our only way to study the innermost radio cores of AGN. Finally, continuum monitoring is cheap (although time-consuming) in comparison with most other methods, and therefore we can observe many more sources and with far better time coverage.

Type
Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 145 - 154
Copyright
Copyright © Kluwer 1994 

References

Aller, H.D., et al. 1985, ApJS 59, 513 Google Scholar
Aller, M.F., et al. 1992, ApJ 399, 16 Google Scholar
Barthel, P.D. 1989, ApJ 336, 606 CrossRefGoogle Scholar
Brown, L.M.J., et al. 1989, ApJ 340, 129 CrossRefGoogle Scholar
Eckart, A., et al. 1989, MNRAS 239, 381 Google Scholar
Gear, W.K., et al. 1993, it MNRAS, in press Google Scholar
Ghosh, T., Gopal-Krishna, 1990, A&A 230, 297 Google Scholar
Hughes, P.A., et al. 1989, ApJ 341, 54 Google Scholar
Hughes, P.A., et al. 1992, ApJ 396, 469 CrossRefGoogle Scholar
Lainela, M. 1993, A&A , in press Google Scholar
Lainela, M., Valtaoja, E. 1993, ApJ , in press Google Scholar
Marscher, A., Gear, W.K. 1985, ApJ 298, 114 CrossRefGoogle Scholar
Robson, E.I., et al. 1993, it MNRAS 262, 249 Google Scholar
Steppe, H., et al. 1992 A&AS 96, 441 Google Scholar
Teräsranta, H., Valtaoja, E. 1993, A&A , in press Google Scholar
Teräsranta, H., et al. 1992, A&AS 94, 121 Google Scholar
Tornikoski, M., et al. 1993, AJ 105, 1680 CrossRefGoogle Scholar
Valtaoja, E., et al. 1988, A&A 203, 1 Google Scholar
Valtaoja, E., et al. 1992a, A&A 254, 71 Google Scholar
Valtaoja, E., et al. 1992b, A&A 254, 80 Google Scholar
Wiren, S., et al. 1992, AJ 104, 1009 Google Scholar
Zhang, Y.F., et al., 1993, ApJ , in press Google Scholar