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
Chapter

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 
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

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

Personalised recommendations