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
Pages (from-to)756-762
JournalAdvances in Space Research
Issue number2
Publication statusPublished - 15 Jan 2020
MoE publication typeA1 Journal article-refereed

    Research areas

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

ID: 33942028