VSOP observations of the BL Lac object 2007+777

Authors: Jin C.¹; Krichbaum T.P.²; Witzel A.²; Nan R.¹; Peng B.¹; Kraus A.³; Lobanov A.³; Qian S.³; Zensus J.A.³

Source: Astrophysics and Space Science, Volume 278, Numbers 1-2, 2001 , pp. 97-100(4)

Publisher: Springer

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 cleasly 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 evidente 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 Lac; IDV; structural variability

Language: English

Document Type: Regular paper

Affiliations: 1: Beijing Astronomical Observatory, National Astronomical Observatories, China 2: Max-Planck-Institut für Radioastronomie, Germany 3: Max-Planck-Institut für Radioastronomáe, Germany

Publication date: 2001-01-01

• In this: publication
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• In this Subject: Astronomy
• By this author: Jin C. ;  Krichbaum T.P. ;  Witzel A. ;  Nan R. ;  Peng B. ;  Kraus A. ;  Lobanov A. ;  Qian S. ;  Zensus J.A.

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