The origin of the UV excess in powerful radio galaxies: spectroscopy and polarimetry of a complete sample of intermediate‐redshift radio galaxies
The origin of the UV excess in powerful radio galaxies: spectroscopy and polarimetry of a complete sample of intermediate‐redshift radio galaxies
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强大射电星系中紫外线过剩的起源：中间红移射电星系完整样本的光谱学和偏振测量
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Hughes
中科院分区：
文献类型：
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作者：
C. Tadhunter;R. Dickson;R. Morganti;T. Robinson;K. Wills;M. Villar;M. Hughes
我们提出了一个完整的，光学无偏的2-Jy射电星系样本的光谱和偏振观测，在中间红移（0.15%）水平。对光谱的仔细测量和建模使我们能够量化其他成分对紫外线过量的贡献。我们表明，星云连续体（在所有物体中存在3- 40%的水平），直接活动星系核（AGN）光（在40%的物体中显著）和年轻恒星群（在15% - 50%的物体中显著）都对强大射电星系种群中的紫外连续体做出了重要贡献。这些结果有助于强调射电星系中紫外线连续体的多组分性质。结果还指出了我们样本物体的光学/紫外和远红外特性之间的有趣联系，从某种意义上说，具有最清晰的光学/紫外星暴活动证据的物体在远红外波长上也是最亮的。这支持了这样一种观点，即射电星系中较冷的尘埃成分是由恒星爆发而不是AGN加热的。
We present spectroscopic and polarimetric observations of a complete, optically unbiased sample of 2-Jy radio galaxies at intermediate redshifts (0.15 10 per cent level. Careful measurement and modelling of our spectra have allowed us to quantify the contributions of other components to the UV excess. We show that nebular continuum (present in all objects at the 3-40 per cent level), direct active galactic nucleus (AGN) light (significant in 40 per cent of objects) and young stellar populations (significant in 15 - 50 per cent of objects) all make important contributions to the UV continuum in the population of powerful radio galaxies. These results serve to emphasize the multicomponent nature of the UV continuum in radio galaxies. The results also point to an interesting link between the optical/UV and far-IR properties of our sample objects, in the sense that the objects with the clearest evidence for optical/UV starburst activity are also the most luminous at far-IR wavelengths. This supports the idea that the cooler dust components in radio galaxies are heated by starbursts rather than by AGN.