VSOP and ground-based VLBI observations of Markarian 421

Details VSOP and ground-based VLBI observations of Markarian 421 VSOP and ground-based VLBI observations of Markarian 421

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..711p&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 8-10, p. 711-716.

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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