Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205...84j&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Computer Science
2
Scientific paper
Accumulating evidence strongly favours interstellar scintillation (ISS) as the origin of intra-day variability (IDV) at cm-wavelengths. This evidence includes the observed character of IDV as a function of wavelength, the discovery of very rapid variability with time-scales as short as hours, the presence of an annual time-scale in the signature of the long-term IDV of several sources, and the measured time-delay in the IDV pattern of PKS0 405-385 observed at widely spaced telescopes. ISS implies the presence of microarcsecond angular sized structures in these AGN. Such structures appear common in AGN and present several problems in explaining them with simple synchrotron mechanisms. Firstly, the implied brightness temperatures of TB> 1014 K are well above the inverse Compton limit. Secondly, the observed IDV lifetimes of at least a decade are longer than might be expected. Thirdly, the presence of strong and variable circular polarization cannot be simply explained.
Bignall Hayley E.
Jauncey David L.
Kedziora-Chudczer Lucyna
Lovell James E. J.
Macquart Jean-Pierre
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