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Interstellar Scintillation and Scattering of Micro-arc-second AGN

CSIRO Astronomy and Space Science, Epping 1710, Australia
Research School of Astronomy and Astrophysics, Australian National University, Canberra 2611, Australia
CSIRO Astronomy and Space Science, Kensington 6151, Australia
School of Physics, The University of New South Wales, Sydney 2052, Australia
Australian Centre for Astrobiology, The University of New South Wales, Sydney 2052, Australia
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen ∅, Denmark
University of Tasmania, School of Physical Sciences, Private Bag 37, Hobart 7001, Australia
ICRAR/Curtin University, Curtin Institute of Radio Astronomy, Perth 6845, Australia
ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), The University of Sydney, Sydney 2006, Australia
NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
Center for Space Science and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
Department of Physics, The Catholic University of America, 620 Michigan Ave NE, Washington, DC 20064, USA
Nordic Optical Telescope, La Palma, Canary Islands 3537, Spain
ECE Department, University of California San Diego, La Jolla, CA 92093, USA
Author to whom correspondence should be addressed.
Academic Editors: Jose. L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(4), 62;
Received: 5 September 2016 / Revised: 30 October 2016 / Accepted: 3 November 2016 / Published: 14 November 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
The discovery of the first quasar 3C 273 led directly to the discovery of their variability at optical and radio wavelengths. We review the radio variability observations, in particular the variability found at frequencies below 1 GHz, as well as those exhibiting intra-day variability (IDV) at cm wavelengths. Observations have shown that IDV arises principally from scintillation caused by scattering in the ionized interstellar medium of our Galaxy. The sensitivity of interstellar scintillation towards source angular sizes has provided a powerful tool for studying the most compact components of radio-loud AGN at microarcsecond and milliarcsecond scale resolution. View Full-Text
Keywords: quasars; variability; interstellar scattering quasars; variability; interstellar scattering
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Jauncey, D.L.; Bignall, H.E.; Kedziora-Chudczer, L.; Koay, J.Y.; Lovell, J.E.J.; Macquart, J.-P.; Ojha, R.; Pursimo, T.; Reynolds, C.; Rickett, B.J. Interstellar Scintillation and Scattering of Micro-arc-second AGN. Galaxies 2016, 4, 62.

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