Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510913j&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #109.13; Bulletin of the American Astronomical Society, Vol. 26, p.1505
Other
Scientific paper
Global VLBI observations at lambda1 .3cm have been made of the bright, nearby, radio galaxy Virgo A (3C274). The host galaxy, M87, contains the prototypical extragalactic jet which has been well-studied at all wavelengths from radio to X-ray. We show images with linear resolutions of ~ 0.01pc at two epochs separated by 5 months. These are the highest linear resolution images achieved so far on an active galactic nucleus. This resolution corresponds to ~ 10(2) Schwarzchild radii for the supermassive black hole ( ~ 3*E(9) Msun) suggested by recent HST observations of this galaxy. Our new VLBI observations reveal a compact core and well-collimated jet, which are remarkably similar to those seen on much larger spatial scales. The core is mildly variable ( ~ 30% in ~ 5 months). The jet is well collimated on these scales (opening angle ~ 18 (deg) ), and indicates that most of the initial jet collimation occurs well within ~ 1 pc of the engine. No proper motion above the detection limit of 0.03c is seen in the jet. The implications of this measurement in the context of other proper motion measurements farther out in the jet are examined. (Also see Biretta & Junor.)
Biretta John A.
Junor William
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