The Impact of Interstellar Scintillation on Astrometric VLBI

Author/Creator ORCID

Date

2004

Department

Program

Citation of Original Publication

Jauncey, David; Lovell, James; Ojha, Roopesh; Fey, Alan L.; Koyama, Yasuhiro; Bignall, Hayley E.; Kedziora-Chudczer, Lucyna; Macquart, Jean-Pierre; Rickett, Barney J.; Titov, Oleg; Tzioumis, Anastasios K.; The Impact of Interstellar Scintillation on Astrometric VLBI; General Meeting Proceedings, p. 109-112; http://articles.adsabs.harvard.edu/pdf/2004ivsg.conf..109J

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.

Subjects

Abstract

We review the evidence demonstrating the interstellar scintillation (ISS) is the principal mechanism responsible for the intra-day variability (IDV) seen at cm wavelengths in many compact, flat-spectrum extra-galactic radio sources. The presence of ISS in a radio source implies the presence of microarcsecond structure in the source. We examine the implications of such compact structure, and suggest that these ultra-compact radio scintillators may form a significant part of the next generation International Celestial Reference Frame (ICRF) sources because of their high level of compactness and positional stability.