VSOP Observations of the BL LAC Object 2007+777
- 110 Downloads
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.
KeywordBL Lac, IDV, structural variability
Unable to display preview. Download preview PDF.