Radio Intra-Day Variability: Answers and Questions

被引：0
|
作者：
David L. Jauncey
Lucyna Kedziora-Chudczer
James E.J. Lovell
Jean-Pierre Macquart
George D. Nicolson
Rick A. Perley
John E. Reynolds
Anastasios K. Tzioumis
Mark H. Wieringa
Hayley E. Bignall
机构：
[1] Australia Telescope National Facility,RCfTA, School of Physics
[2] CSIRO,Department of Physics and Mathematical Physics
[3] Australia Telescope National Facility,undefined
[4] and Anglo-Australian Observatory,undefined
[5] Australia Telescope National Facility,undefined
[6] CSIRO,undefined
[7] University of Sydney,undefined
[8] Hartebeesthoek Radio Astronomy Observatory,undefined
[9] National Radio Astronomy Observatory,undefined
[10] Australia Telescope National Facility,undefined
[11] CSIRO,undefined
[12] Australia Telescope National Facility,undefined
[13] CSIRO,undefined
[14] Australia Telescope National Facility,undefined
[15] CSIRO,undefined
[16] University of Adelaide,undefined
来源：
Astrophysics and Space Science | 2001年 / 278卷
关键词：
Brightness Temperature; Active Galactic Nucleus; VLBI Observation; Radio Wavelength; Astrophysical Phenomenon;
D O I：
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中图分类号：
学科分类号：
摘要：
Intra-day variability (IDV) of active galactic nuclei (AGN) has been detected from gamma-ray 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 as1018 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.
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页码：87 / 92
页数：5
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