Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.278...97j&link_type=abstract
Astrophysics and Space Science, v. 278, Issue 1/2, p. 97-100 (2001).
Astronomy and Astrophysics
Astrophysics
2
Bl Lac, Idv, Structural Variability
Scientific paper
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.
Jin Changhao
Kraus Adam
Krichbaum Thomas P.
Lobanov Anatolij
Nan Rendong
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