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Galaxies 2016, 4(4), 62; doi:10.3390/galaxies4040062

Interstellar Scintillation and Scattering of Micro-arc-second AGN

1
CSIRO Astronomy and Space Science, Epping 1710, Australia
2
Research School of Astronomy and Astrophysics, Australian National University, Canberra 2611, Australia
3
CSIRO Astronomy and Space Science, Kensington 6151, Australia
4
School of Physics, The University of New South Wales, Sydney 2052, Australia
5
Australian Centre for Astrobiology, The University of New South Wales, Sydney 2052, Australia
6
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen ∅, Denmark
7
University of Tasmania, School of Physical Sciences, Private Bag 37, Hobart 7001, Australia
8
ICRAR/Curtin University, Curtin Institute of Radio Astronomy, Perth 6845, Australia
9
ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), The University of Sydney, Sydney 2006, Australia
10
NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
11
Center for Space Science and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
12
Department of Physics, The Catholic University of America, 620 Michigan Ave NE, Washington, DC 20064, USA
13
Nordic Optical Telescope, La Palma, Canary Islands 3537, Spain
14
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
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)
View Full-Text   |   Download PDF [3194 KB, uploaded 17 November 2016]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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