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Annual cycles in the interstellar scintillation time-scales of PKS B1519-273 and PKS B1622-253


Carter, SJB and Ellingsen, SP and Macquart, JP and Lovell, JEJ, Annual cycles in the interstellar scintillation time-scales of PKS B1519-273 and PKS B1622-253, Monthly Notices of the Royal Astronomical Society, 396, (3) pp. 1222-1230. ISSN 0035-8711 (2009) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2009.14824.x


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.

Item Details

Item Type:Refereed Article
Keywords:scattering-ISM:general-galaxies:active-galaxies:nuclei-radio continuum:general
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Carter, SJB (Dr Steven Carter)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:57515
Year Published:2009
Funding Support:Australian Research Council (DP0770157)
Web of Science® Times Cited:8
Deposited By:Physics
Deposited On:2009-07-23
Last Modified:2010-03-25

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