The milliarcsecond structure of 3C 273 at 22 GHz

Details The milliarcsecond structure of 3C 273 at 22 GHz The milliarcsecond structure of 3C 273 at 22 GHz

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1777z&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1777-1784.

Astronomy and Astrophysics

Astronomy

50

Astronomical Photography, Quasars, Radio Jets (Astronomy), Stellar Evolution, Very Long Base Interferometry, High Resolution, Image Processing, Radio Sources (Astronomy), Stellar Mass

Scientific paper

The first VLBI images at 22 GHz of the jet in the quasar 3C 273 are presented. In addition to the compact core region, two emission regions can be identified with features seen at lower frequencies; they separate from the core with constant speeds of 0.65 + or - 0.09 and 0.92 + or - 0.11 mas/yr, corresponding to apparent superluminal motion of 4.3 + or - 0.3c and 6.1 + or - 0.3c (for Ho = 100 km/s Mpc, qo = 0.5). The core region brightened at about the estimated epoch of zero separation for the latest superluminal component, suggesting a causal relationship. The curved ridge line of the jet smoothly extends inward towards the core, although no pronounced bends in the range of core distance 0.5-2.5 mas are seen. No significant evidence is found against a common path of subsequent superluminal features. An apparent frequency dependence in the position of one superluminal feature tentatively suggests that opacity effects across the jet direction are present. The results are consistent with an interpretation of the superluminal features as shocks in an underlying relativistic flow, although alternative explanations cannot be ruled out.

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