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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



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ID: 11220.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Intraday variability in Northern Hemisphere radio sources
Authors:Krichbaum, T. P.; Kraus, A.; Fuhrmann, L.; Cimò, G.; Witzel, 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:14
End Page:18
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We summarise results from flux density monitoring campaigns performed with the 100 m radio telescope at Effelsberg and the VLA during the past 15 yrs. We briefly discuss some of the statistical properties from now more than 40 high declination sources (deltagreater than or equal to30degrees), which show intraday variability (IDV). In general, IDV is more pronounced for sources with flat radio spectra and compact VLBI structures. For 0917 + 62, we present new VLBI images which suggest that the variability pattern is modified by the occurrence of new jet components. For 0716 + 71, we show the first detection of IDV at millimetre wavelengths (32 GHz). For the physical interpretation of the IDV phenomenon, a complex source and frequency dependent superposition of interstellar scintillation and source intrinsic variability should be considered.
Free Keywords:quasars : general; quasars : individual (0716+71;0917+62;0954+65); radio continuum : ISM; scattering
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:000176482500004
ISSN:1323-3580
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