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The MASIV Legacy: Surveying AGN Intra-day Variability at Radio Wavelengths

Published online by Cambridge University Press:  25 July 2014

J. Y. Koay ,
J.-P. Macquart ,
B. J. Rickett ,
H. E. Bignall ,
D. L. Jauncey ,
T. Pursimo ,
C. Reynolds ,
J. E. J. Lovell ,
L. Kedziora-Chudczer  and
R. Ojha
J. Y. Koay*
Affiliation:
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark International Centre for Radio Astronomy Research, Curtin University, Australia
J.-P. Macquart
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Australia
B. J. Rickett
Affiliation:
Department of Electrical & Computer Engineering, University of California, San Diego, USA
H. E. Bignall
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Australia
D. L. Jauncey
Affiliation:
CSIRO Astronomy & Space Science, & Australian National University, Australia
T. Pursimo
Affiliation:
Nordic Optical Telescope, Spain
C. Reynolds
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Australia
J. E. J. Lovell
Affiliation:
School of Mathematics & Physics, University of Tasmania, Australia
L. Kedziora-Chudczer
Affiliation:
School of Physics & Astrophysics, University of New South Wales, Australia
R. Ojha
Affiliation:
Institute for Astrophysics & Computational Sciences, Catholic University of America, USA
*
*email: koayjy@dark-cosmology.dk
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Abstract

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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.

Keywords

galaxies: activeradio continuum: ISMscattering
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 415 - 416
Copyright
Copyright © International Astronomical Union 2014 

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