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arXiv 0709.1841astro-ph
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z=2.6射电星系0828+193的UV和光学发射线：空间分辨测量

UV and optical emission lines from the z=2.6 radio galaxy 0828+193: spatially resolved measurements

A. Humphrey, F. Iwamuro, M. Villar-Martin, L. Binette, R. Fosbury, S. di Serego Alighieri

备注：
Accepted for publication in MNRAS
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摘要：

我们提出了一个调查的空间变化的静止框架紫外线和光学线和连续辐射沿z=2.6射电星系0828+193的射电轴，使用长缝光谱从凯克II和斯巴鲁望远镜。线的亮度，线比和电子温度进行了检查，并与射电源的臂长不对称性的关系进行了研究。我们发现在射波瓣最短的核一侧，气体覆盖因子较高，电离参数较低。解释谱线亮度的不对称性和无线电臂长的不对称性所需的环境密度的对比彼此相当一致。这些结果进一步支持了McCarthy，van Breugel & Kapahi（1991）的结论--强射电源中的波瓣距离不对称是环境密度不对称的结果。我们还注意到，紫外和光学连续谱发射的亮度显示出类似的空间不对称性所示的线发射。虽然紫外连续谱的不对称性可以完全用星云连续谱中预期的不对称性来解释，但光学连续谱的不对称性却不能。我们认为，至少在光学波长，星光和/或散射光也必须是强烈的空间不对称。

英文摘要：

We present an investigation into the spatial variation of the rest-frame UV and optical line and continuum emission along the radio axis of the z=2.6 radio galaxy 0828+193, using long-slit spectra from the Keck II and Subaru telescopes. Line brightnesses, line ratios and electron temperatures are examined, and their relationship with the arm-length asymmetry of the radio source is also investigated. We find that on the side of the nucleus with the shortest radio lobe, the gas covering factor is higher, and the ionization parameter is lower. The contrasts in environmental density required to explain the asymmetries in the line brightness and the radio arm-length asymmetries are in fair agreement with each other. These results add further weight to the conclusion of McCarthy, van Breugel & Kapahi (1991) - lobe distance asymmetries in powerful radio sources are the result of an asymmetry in the environmental density. We also note that the brightness of both the UV and optical continuum emission shows a similar spatial asymmetry to that shown by the line emission. While the UV continuum asymmetry can be wholly explained by the expected asymmetry in the nebular continuum, the optical continuum asymmetry cannot. We argue that, at least at optical wavelengths, the starlight and/or the scattered light must also be strongly spatially asymmetric.

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