Interstellar scintillation,ISS, and intrinsic variability of radio AGN |
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| Institution: | 1. CSIRO Astronomy & Space Science, Epping 1710, Australia;2. Research School of Astronomy & Astrophysics, Australian National University, Canberra 2611, Australia;3. Institute of Astronomy & Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan;4. CSIRO Astronomy and Space Science, P.O. Box 1130, Bentley, WA 6102, Australia;5. ICRAR, Curtin University, Bentley, WA 6102, Australia;6. ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), The University of Sydney, 2006, Australia;7. Nordic Optical Telescope, La Palma, Canary Islands E-3537, Spain;8. INAF Instituto di Radioastronomia, via Gobetti 101, 1-40129 Bologna, Italy;9. Finnish Centre for Astronomy with ESO (FINCA), University of Turku, FI-20014 Turku, Finland;10. Aalto University Metsähovi Radio Observatory, Metsähovintie 114, 02540 Kylmälä, Finland;11. Owens Valley Radio Observatory, California Institute of Technology, Pasadena, CA 91125, USA;12. University of California, San Diego, La Jolla, CA 92093, USA;13. Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile;14. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1200 E. California Blvd. Pasadena, CA 91125, USA;15. Netherlands Institute for Radio Astronomy (ASTRON), Oude Hogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands;p. School of Natural Sciences, Private Bag 37, University of Tasmania, Hobart 7001, Australia;q. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA;r. Center for Space Science and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA;s. Department of Physics, The Catholic University of America, 620 Michigan Ave NE, Washington, DC 20064, USA;t. Computational Engineering and Science Research Centre, University of Southern Queensland, Darling Heights, QLD 4350, Australia |
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| Abstract: | We investigate the relationship between the 5 GHz interstellar scintillation (ISS) and the 15 GHz intrinsic variability of the compact, radio-selected active galactic nuclei (AGN) common to the Microarcsecond Scintillation-Induced Variability (MASIV) Survey and the Owens Valley Radio Observatory blazar flux density monitoring program. As part of this investigation, we also re-examine the reported intrinsic nature of the February 1990 VLA observations of the blazar S5 0716+714. We are also examining the presence of IDV/ISS in the Owens Valley 15 GHz flux density monitoring data. We find a significant relationship between the Owens Valley 15 GHz modulation index and the MASIV modulation index. We also discuss the implications of these findings for RadioAstron. |
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| Keywords: | Active galactic nuclei Radio continuum: Quasars Variability Interstellar scintillation |
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