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首页> 外文期刊>The Astrophysical journal >THE ALIGNED z ～ 1 RADIO GALAXY 3C 280
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THE ALIGNED z ～ 1 RADIO GALAXY 3C 280

机译：对齐的z〜1无线电星系3C 280

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摘要

The z ～ 1 radio galaxy 3C 280 has a particularly striking rest-frame UV morphology, with multiple line and continuum components precisely aligned with the radio structure, including an obvious semicircular arc. Here we explore the nature of these various components by bringing together Hubble Space Telescope and ground-based imaging, ground-based spectroscopy, and radio mapping. From plausible decompositions of the spectra, we show that the continuum of the nuclear component is likely dominated by a combination of nebular thermal continuum, quasar light, and light from old stars. A component that falls directly on the probable path of the radio jet shows mostly nebular thermal continuum and includes contributions from a relatively young stellar population with age around 100 Myr. The arc appears to be completely dominated by line emission and nebular thermal continuum, with no evidence for a significant stellar contribution. Although much of the aligned light is in UV components, the underlying old elliptical galaxy is also well aligned with the radio axis. The elliptical galaxy is well fitted by a de Vaucouleurs profile, probably has a moderately old stellar population (～3 Gyr), and is a massive system with a velocity dispersion of σ ≈ 270 km s~(-1) that implies that it contains a supermassive black hole. Although the arc and the extended emission surrounding the eastern lobe suggest that interactions between the radio lobe and jet must have been important in creating the UV morphology, the ionization and kinematic properties in these components are more consistent with photoionization than shock excitation. 3C 280 may be a transition object between the compact steep-spectrum radio galaxies, which seem to be shock-dominated, and the extended radio sources, which may have evolved past this phase and rarely show shock signatures.
机译：z〜1射电星系3C 280具有特别引人注目的静止帧UV形态，其多个线和连续谱分量与射电结构精确对齐，包括明显的半圆弧。在这里，我们将哈勃太空望远镜与地基成像，地基光谱学和射电制图结合起来，探索了这些各个组成部分的性质。从频谱的合理分解中，我们表明核成分的连续体很可能由星云热连续体，类星体光和旧星发出的光的组合所主导。直接落在射流的可能路径上的成分主要表现为星云状热连续体，并且包括年龄相对较小，年龄约为100 Myr的恒星种群的贡献。电弧似乎完全受线发射和星云热连续性的支配，没有证据表明存在明显的恒星贡献。尽管大部分对齐后的光都在UV分量中，但是下面的旧椭圆星系也与光轴很好地对齐。椭圆星系很好地符合de Vaucouleurs轮廓，可能具有适度的旧星体（〜3 Gyr），并且是一个具有σ≈270 km s〜（-1）的速度色散的大型系统。一个超大质量的黑洞。尽管弧形波和东部波瓣周围的扩展发射表明无线电波波瓣和射流之间的相互作用对于产生UV形态必定很重要，但这些成分中的电离和运动学性质与电离相比比激波激发更一致。 3C 280可能是紧凑的陡谱无线电星系和扩展的无线电源之间的过渡对象，紧凑的陡谱无线电星系似乎是受冲击支配的，而扩展的无线电源可能已经发展到超过此阶段并且很少显示出冲击特征。

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