Interstellar Scintillation, ISS, and Intrinsic Variability of Radio AGN

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 output: Contribution to journalArticleScientificpeer-review

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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
Number of pages7
JournalAdvances in Space Research
Issue number2
Publication statusPublished - 15 Jan 2020
MoE publication typeA1 Journal article-refereed


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


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