Adelaide Research & Scholarship
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https://hdl.handle.net/2440/12448
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| Type: | Journal article |
| Title: | Radio intra-day variability: Answers and questions |
| Author: | Jauncey, D. L. Kedziora-Chudczer, L. Lovell, James E. J. Macquart, Jean-Pierre Nicolson, G. D. Perley, R. A. Reynolds, J. E. Tzioumis, A. K. Wieringa, M. A. Bignall, Hayley Emma |
| Citation: | Astrophysics and Space Science, 2001; 278 (1-2):87-92 |
| Publisher: | Springer |
| Issue Date: | 2001 |
| ISSN: | 0004-640X |
| School/Discipline: | School of Chemistry and Physics : Physics and Mathematical Physics |
| Statement of Responsibility: | 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 and Hayley E. Bignall |
| Abstract: | 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. |
| Description: | The original publication can be found at www.springerlink.com |
| DOI: | 10.1023/A:1013195520544 |
| Appears in Collections: | Physics publications |
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