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：

暂无

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.

引用

页码：87 / 92

页数：5

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