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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents ID: 10871.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie The size of IDV jet cores Authors: Beckert, T.; Krichbaum, T. P.; Cimo, G.; Fuhrmann, L.; Kraus, A.; Witzel, A.; Zensus, J. A. Language: English Date of Publication (YYYY-MM-DD): 2002 Title of Journal: Publications of the Astronomical Society of Australia Journal Abbrev.: Publ. Astron. Soc. Aust. Volume: 19 Issue / Number: 1 Start Page: 55 End Page: 59 Review Status: Peer-review Audience: Experts Only Abstract / Description: Radio variability on timescales from a few hours to several days in extragalactic flat spectrum radio sources is generally classified as intraday variability (IDV). The origin of this short term variability is still controversial and both extrinsic and intrinsic mechanisms must be considered and may both contribute to the observed variations. The measured linear and circular polarisation of IDV sources constrains the low energy end of the electron population. Any population of cold electrons within sources at or above the equipartition temperature of 10(11) K depolarises the emission and can be ruled out. Intrinsic shock models are shown to either violate the large fraction of sources displaying IDV or they do not relax the light travel time argument for intrinsic variations. From structure function analysis, we further conclude that interstellar scintillation also leads to tight size estimates unless a very local cloud in the ISM is responsible for IDV. Free Keywords: quasars : individual (0917+624); ISM : structure; turbulence External Publication Status: published Document Type: Article Communicated by: N. N. Affiliations: MPI für Radioastronomie External Affiliations: Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany Identifiers: ISI:000176482500013 ISSN:1323-3580 The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.