Interstellar Scintillation, ISS, and Intrinsic Variability of Radio AGN

Research output: Contribution to journalArticleScientificpeer-review


  • David L. Jauncey
  • Jun Yi Koay
  • Hayley Bignall
  • Jean-Pierre Macquart
  • Tapio Pursimo
  • Marcello Giroletti
  • Talvikki Hovatta

  • Sebastian Kiehlmann
  • Barney Rickett
  • Anthony Readhead
  • Walter Max-Moerbeck
  • Harish Vedantham
  • Cormac Reynolds
  • James Lovell
  • Roopesh Ojha
  • Lucyna Kedziora-Chudczer

Research units

  • Australian National University
  • Academia Sinica Taiwan
  • Curtin University
  • University of Sydney
  • Nordic Optical Telescope
  • INAF National Institute for Astrophysics
  • University of Turku
  • California Institute of Technology
  • University of California
  • Universidad de Chile
  • Netherlands Institute for Radio Astronomy (ASTRON)
  • University of Tasmania
  • NASA Goddard Space Flight Center
  • University of Maryland
  • Catholic University of America
  • University of Southern Queensland


We investigate the relationship between the 5 GHz interstellar scintillation (ISS) and the 15 GHz intrinsic variability of the compact, radio-selected active galactic nuclei (AGN) common to the Microarcsecond Scintillation-Induced Variability (MASIV) Survey and the Owens Valley Radio Observatory blazar flux density monitoring program. As part of this investigation, we also re-examine the reported intrinsic nature of the February 1990 VLA observations of the blazar S5 0716+714. We are also examining the presence of IDV/ISS in the Owens Valley 15 GHz flux density monitoring data. We find a significant relationship between the Owens Valley 15 GHz modulation index and the MASIV modulation index. We also discuss the implications of these findings for RadioAstron.


Original languageEnglish
JournalAdvances in Space Research
Publication statusPublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Active galactic nuclei, Radio continuum: Quasars, Variability, Interstellar scintillation

ID: 33942028