The microarcsecond structure of 3C 273 at 3 MM
Recent improvements in data analysis and receiver techniques have made it possible to produce a map of the 100 GHz emission from the compact radio source 3C273, with the unsurpassed resolution of 50 microarcsec. The map shows that the structure within 300 microarcsec (about 1.5 x 10 to the 18th/h cm) has a position angle significantly different from the position angle of the jet observed at lower frequencies. There are also indications in the map that the inner structure has a more pronounced wiggling structure than has been observed on larger scales. The observations were made about 60 days from the start of the outburst of 1988. Most of the flux from the outburst is concentrated in a component which is elongated about (56 x 5) x 10 to the 16th/h cm perpendicular to the overall jet-axis. The distance between this component and the core is about 128 microarcsec, which corresponds to the distance expected from an apparent velocity of about 800 microarcsec/yr.