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The MASIV legacy: Surveying AGN intra-day variability at radio wavelengths

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Authors
Koay, Jun Yi
Macquart, Jean-Pierre
Rickett, B.
Bignall, Hayley
Jauncey, D.
Pursimo, T.
Reynolds, Cormac
Lovell, J.
Kedziora-Chudczer, L.
Ojha, R.
Date
2014
Type
Conference Paper

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Koay, J.Y. and Macquart, J. and Rickett, B. and Bignall, H. and Jauncey, D. and Pursimo, T. and Reynolds, C. et al. 2014. The MASIV legacy: Surveying AGN intra-day variability at radio wavelengths, in Mickaelian, A. and Aharonian, F. and Sanders, D. (ed), Proceedings of the International Astronomical Union Symposium S304, Oct 7 2013, Oct 7 2013, pp. 415-416. Byurakan, Armenia: Cambridge University Press.
Source Title
Proceedings of the International Astronomical Union
Source Conference
IAUS 304: Multiwavelength AGN surveys and studies
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Curtin Institute of Radio Astronomy
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Abstract

The Micro-arcsecond Scintillation-Induced Variability (MASIV) Survey and its follow-up observations have provided large datasets of AGN intra-day variability (IDV) at radio wavelengths. These data have shown that IDV arises mainly from scintillation caused by scattering in the ionized interstellar medium (ISM) of our Galaxy, based on correlation with Galactic latitudes and line-of-sight Galactic electron column densities. The sensitivity of interstellar scintillation (ISS) towards source angular sizes has provided a new tool for studying the most compact components of radio-loud AGNs at microarcsecond (µas) scale resolution - much higher than any ground-based radio interferometer. We present here key results from the MASIV Survey and its follow-up observations, and point to relevant papers where these results have been published.