Evidence for Acceleration and Nonradial Motion of Parsec-Scale Jet Components in the Lobe-dominated Superluminal Quasar 3C 263

Details Evidence for Acceleration and Nonradial Motion of Parsec-Scale Jet Components in the Lobe-dominated Superluminal Quasar 3C 263 Evidence for Acceleration and Nonradial Motion of Parsec-Scale Jet Components in the Lobe-dominated Superluminal Quasar 3C 263

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464..715h&link_type=abstract

Astrophysical Journal v.464, p.715

Astronomy and Astrophysics

Astronomy

11

Galaxies: Jets, Galaxies: Nuclei, Galaxies: Quasars: Individual Alphanumeric: 3C 263, Radio Continuum: Galaxies

Scientific paper

We report evidence for accelerated and nonradial motion of parsec- scale jet components in the nucleus of the lobe-dominated quasar 3C 263. New VLBI maps at 10.7 GHz confirm that the jet component J1 moves with superluminal speed. While the initial apparent transverse velocity of J1 was v_app_ ~ 1.2 h^-1^ c (H_0_ = 100h kms^-1^ Mpc^-1^, q_0_ = 0.5), the new maps indicate an average v_app_ ~ 2.2 h^-1^ c over a span of ~8 yr. This suggests the possibility of component acceleration, which could most simply be accounted for in a relativistic jet model that allows time variations in the Lorentz factor. The new maps also reveal a second jet component J2 that has moved along a significantly different radial direction than J1 with respect to the core component C. Component J2 shows a marginal change in direction that may be bringing it into alignment with the path of J1. We estimate v_app_ ~ 0.7 h^-1^c for J2. We also present a new 8.4 GHz VLBI map that will enable us to continue monitoring 3C 263 with the VLBA. We relate our results to other properties of 3C 263 and discuss their implications for relativistic jet models and "unified schemes." We conclude that the low superluminal speeds in many lobe-dominated quasars, together with the suggested mildly accelerated and nonradial motion exhibited by 3C 263, are consistent with unification of core- and lobe-dominated quasars.

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