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VSOP Observations of the BL LAC Object 2007+777

  • C. Jin
  • T. P. Krichbaum
  • A. Witzel
  • R. Nan
  • B. Peng
  • A. Kraus
  • A. Lobanov
  • S. Qian
  • J. A. Zensus
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Abstract

We present three epochs of VSOP observations of the BL Lac object 2007+777 at 5 GHz.Compared with the ground-based VLBA data, the space baselines with HALCA clearly reveal a moredetailed and finer source structure. Mainly based on the quite uniform and circular UV-coverages ofthe VLBA, and using a new cross-selfcalibration method, we have found evidence for weak structuralchanges on a timescale of two weeks in the core region of this intraday variable source. The physicalcauses for these variations are discussed.

Keyword

BL Lac, IDV, structural variability 

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References

  1. Biermann, P., Duerbeck, H., Eckart, A., et al.: 1981, ApJ 247, L53.ADSCrossRefGoogle Scholar
  2. Peng, B., Kraus, A., Krichbaum, T.P., et al.: 2000, A&A 353, 937.ADSGoogle Scholar
  3. Witzel, A., Schalinski, C.J, Johnston, K.J., et al.: 1988, A&A 206, 245.ADSGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • C. Jin
    • 1
  • T. P. Krichbaum
    • 2
  • A. Witzel
    • 2
  • R. Nan
    • 3
  • B. Peng
    • 3
  • A. Kraus
    • 4
  • A. Lobanov
    • 4
  • S. Qian
    • 4
  • J. A. Zensus
    • 4
  1. 1.Beijing Astronomical ObservatoryNational Astronomical ObservatoriesChina
  2. 2.Max-Planck-Institut für RadioastronomieGermany
  3. 3.Beijing Astronomical ObservatoryNational Astronomical ObservatoriesChina
  4. 4.Max-Planck-Institut für RadioastronomieGermany

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