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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 Lovell
We 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 Society

Volume

396

Pagination

1222-1230

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Wiley-Blackwell Publishing Inc

Place of publication

Malden, USA

Rights statement

The definitive published version is available online at: http://interscience.wiley.com

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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