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Annual cycles in the interstellar scintillation time-scales of PKS B1519-273 and PKS B1622-253
journal contribution
posted on 2023-05-16, 23:53 authored by Steven CarterSteven Carter, Simon EllingsenSimon Ellingsen, Macquart, JP, James LovellJames LovellWe have used the University of Tasmania's 30-m radio telescope at Ceduna in South Australia to regularly monitor the flux density of a number of southern blazars. We report the detection of an annual cycle in the variability time-scale of the centimetre radio emission of PKSB1622−253. Observations of PKS B1519−273 over a period of nearly 2 yr confirm the presence of an annual cycle in the variability time-scale in that source. These observations prove that interstellar scintillation is the principal cause of inter-day variability at radio wavelengths in these sources. The best-fitting annual cycle model for both sources implies a high degree of anisotropy in the scattering screen and that it has a large velocity offset with respect to the local standard of rest. This is consistent with a greater screen distance for these 'slow' intra-day variability (IDV) sources than for rapid scintillators such as PKS B0405−385 or J1819+3845.
Funding
Australian Research Council
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
396Pagination
1222-1230ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Wiley-Blackwell Publishing IncPlace of publication
Malden, USARights statement
The definitive published version is available online at: http://interscience.wiley.comRepository Status
- Restricted