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Radio Intra-day Variability: Answers and Questions
journal contribution
posted on 2023-05-16, 19:30 authored by Jauncey, DL, Kedziora-Chudczer, L, James LovellJames Lovell, Macquart, JP, Nicolson, GD, Perley, RA, Reynolds, JE, Tzioumis, AK, Wieringa, MH, Bignall, HEIntra-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.
History
Publication title
Astrophyiscs and Space ScienceVolume
278Issue
1-2Pagination
87-92ISSN
0004-640XDepartment/School
School of Natural SciencesPublisher
SpringerPlace of publication
NetherlandsRepository Status
- Restricted