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VSOP and ground-based VLBI observations of Markarian 421 |
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| Authors: | B G Piner S C Unwin A E Wehrle P G Edwards A L Fey K A Kingham |
| Abstract: | We have produced 22 VLBI images of the TeV blazar Markarian 421 at 11 epochs, including a Space VLBI observation with the HALCA satellite. We measure the speeds of the three innermost jet components to be 0.64±0.33, 0.48±0.09, and 0.06±0.09c (H0=65 km s−1 Mpc−1). Interpretation of these subluminal speeds in terms of the high Doppler factor demanded by the TeV observations is discussed. |
| Keywords: | BL Lacertae objects: individual (Markarian 421) Galaxies: active Galaxies: jets Techniques: interferometric |
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