Interstellar Scintillation and Scattering of Micro-arc-second AGN

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galaxies-04-00062-v2.pdf (3.13 MB)

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https://www.mdpi.com/2075-4434/4/4/62

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https://doi.org/10.3390/galaxies4040062
 http://hdl.handle.net/11603/18051

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UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection

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2016-11-14

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journal articles
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Jauncey, David L.; Bignall, Hayley E.; Kedziora-Chudczer, Lucyna; Koay, Jun Y.; Lovell, James E.J.; Macquart, Jean-Pierre; Ojha, Roopesh; Pursimo, Tapio; Reynolds, Cormac; Rickett, Barney J. 2016. "Interstellar Scintillation and Scattering of Micro-arc-second AGN." Galaxies 4, no. 4: 62.,https://doi.org/10.3390/galaxies4040062

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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.