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

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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 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

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