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Long-term Variability of Extragalactic Sources at 843 MHz

Published online by Cambridge University Press:  25 May 2016

R. W. Hunstead  and
B. M. Gaensler
R. W. Hunstead
Affiliation:
School of Physics, University of Sydney NSW 2006, Australia
B. M. Gaensler
Affiliation:
School of Physics, University of Sydney NSW 2006, Australia

Extract

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Time variability is commonly observed in the most compact extragalactic radio sources. Low-frequency variability (LFV)—at frequencies <1 GHz—is thought to arise through two different mechanisms, intrinsic and extrinsic. The former is just an extension of the often rapid high-frequency variations, delayed and reduced in amplitude. The latter is usually attributed to refractive interstellar scintillation (RISS; Rickett et al. 1984), whereby the variations in intensity are the result of wavefront distortions caused by transverse gradients in electron density. If RISS arises predominantly along the signal path through our Galaxy, we might expect to find evidence for a dependence on Galactic coordinates.

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 103 - 104
Copyright
Copyright © Kluwer 1996 

References

Campbell-Wilson, D. & Hunstead, R.W. (1994), PASA , 11, 33.Google Scholar
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Spangler, S., Fanti, R., Gregorini, L. & Padrielli, L. (1989), A&A , 209, 315.Google Scholar