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VSOP Observations of the BL Lac Object 2007+777*

Published online by Cambridge University Press:  12 April 2016

C. Jin ,
T.P. Krichbaum ,
A. Witzel ,
R. Nan ,
B. Peng ,
A. Kraus ,
A. Lobanov ,
S. Qian  and
J.A. Zensus
C. Jin
Affiliation:
Beijing Astronomical Observatory, National Astronomical Observatories, China
T.P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany
A. Witzel
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany
R. Nan
Affiliation:
Beijing Astronomical Observatory, National Astronomical Observatories, China
B. Peng
Affiliation:
Beijing Astronomical Observatory, National Astronomical Observatories, China
A. Kraus
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany
A. Lobanov
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany
S. Qian
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany
J.A. Zensus
Affiliation:
Max-Planck-Institut für Radioastronomie, Germany

Abstract

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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 more detailed and finer source structure. Mainly based on the quite uniform and circular UV-coverages of the VLBA, and using a new cross-selfcalibration method, we have found evidence for weak structural changes on a timescale of two weeks in the core region of this intraday variable source. The physical causes for these variations are discussed.

Keywords

BL LacIDVstructural variability
Type
Chapter Three Intra-Day Variability, Gravitational Lensing and Polarization
Information
International Astronomical Union Colloquium , Volume 182: Sources and Scintillations: Refraction and Scattering in Radio Astronomy , 2001 , pp. 97 - 100
Copyright
Copyright © Kluwer 2001

Footnotes

*

This research was partially supported by a grant from the National Natural Science Foundation of China.

References

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