Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253
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. Observati...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/40850 |
| _version_ | 1848755982020116480 |
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| author | Carter, S. Ellingsen, S. Macquart, Jean-Pierre Lovell, J. |
| author_facet | Carter, S. Ellingsen, S. Macquart, Jean-Pierre Lovell, J. |
| author_sort | Carter, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:04:57Z |
| format | Journal Article |
| id | curtin-20.500.11937-40850 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:04:57Z |
| publishDate | 2009 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-408502017-09-13T16:05:30Z Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 Carter, S. Ellingsen, S. Macquart, Jean-Pierre Lovell, J. galaxies active galaxies radio continuum scattering nuclei ISM general 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. 2009 Journal Article http://hdl.handle.net/20.500.11937/40850 10.1111/j.1365-2966.2009.14824.x Wiley-Blackwell Publishing Ltd. unknown |
| spellingShingle | galaxies active galaxies radio continuum scattering nuclei ISM general Carter, S. Ellingsen, S. Macquart, Jean-Pierre Lovell, J. Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title | Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title_full | Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title_fullStr | Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title_full_unstemmed | Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title_short | Annual cycles in the interstellar scintillation time-scales of PKSB1519-273 and PKSB1622-253 |
| title_sort | annual cycles in the interstellar scintillation time-scales of pksb1519-273 and pksb1622-253 |
| topic | galaxies active galaxies radio continuum scattering nuclei ISM general |
| url | http://hdl.handle.net/20.500.11937/40850 |