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The z~1 radio galaxy 3C280 has a striking rest-frame UV morphology, withmultiple line and continuum components precisely aligned with the radiostructure, including an obvious semi-circular arc. We explore the nature ofthese various components by bringing together HST and ground-based imaging,ground-based spectroscopy, and radio mapping. From plausible decompositions ofthe spectra, we show that the continuum of the nuclear component is likelydominated by a combination of nebular thermal continuum, quasar light, andlight from old stars. A component that falls directly on the probable path ofthe radio jet shows mostly nebular thermal continuum and includes contributionsfrom a relatively young stellar population with an age around 100 Myr. The arcappears to be completely dominated by line emission and nebular thermalcontinuum, with no evidence for a significant stellar contribution. Though muchof the aligned light is in UV components, the underlying old elliptical is alsowell-aligned with the radio axis. The elliptical is well-fit by a deVaucouleurs profile, probably has a moderately old stellar population (~3 Gyr),and is a massive system with a velocity dispersion of sigma ~ 270 km/s thatimplies it contains a supermassive black hole. Although the arc and theextended emission surrounding the eastern lobe suggest that interactionsbetween the radio lobe and jet must have been important in creating the UVmorphology, the ionization and kinematic properties in these componentsare moreconsistent with photoionization than shock excitation. 3C280 may be atransition object between the compact steep-spectrum radio galaxies which seemto be shock-dominated, and the extended radio sources which may have evolvedpast this phase and rarely show shock signatures.Comment: 43 pages, including 14 figures; to appear in ApJ, vol 60

The Alignedz ∼ 1 Radio Galaxy 3C 280