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Radio Intra-day Variability: Answers and Questions

Citation

Jauncey, DL and Kedziora-Chudczer, L and Lovell, JEJ and Macquart, JP and Nicolson, GD and Perley, RA and Reynolds, JE and Tzioumis, AK and Wieringa, MH and Bignall, HE, Radio Intra-day Variability: Answers and Questions, Astrophyiscs and Space Science, 278, (1-2) pp. 87-92. ISSN 0004-640X (2001) [Refereed Article]

DOI: doi:10.1023/A:1013195520544

Abstract

Intra-day variability (IDV) of active galactic nuclei (AGN) has been detected from gammaray energies to radio wavelengths. At high energies, such variability appears to be intrinsic to the sources themselves. However, at radio wavelengths, brightness temperatures as high as 1018 to 1021 K are encountered if the IDV is intrinsic to the source. We discuss here the accumulating evidence showing that, at radio wavelengths where the highest brightness temperatures are encountered, interstellar scintillation (ISS) is the principal mechanism causing IDV. While ISS reduces the implied brightness temperatures, they still remain uncomfortably high.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:45369
Year Published:2001
Web of Science® Times Cited:5
Deposited By:Physics
Deposited On:2007-07-11
Last Modified:2011-08-03
Downloads:0

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