z = 2.44射电星系MRC 0406 - 244周围扩展的电离气体：超气泡的性质和光学线亮度的不对称性
The extended ionized gas around the z=2.44 radio galaxy MRC 0406-244: the nature of the superbubbles and the optical line brightness asymmetries
摘要：
在这封信中，我们调查的性质，戏剧性的“超级气泡”的发射结构与z = 2.44射电星系MRC 0406 - 244，使用静止帧光谱和档案HST NICMOS图像。根据谱线比和HST形貌，我们认为超气泡中的气体是被遮蔽的活性核光电离的。我们认为，这种类型的结构可能与在许多高Z射电星系前面检测到的空间扩展HI吸收体有关。我们还认为，我们可能正在目睹扩展发射线区域的破坏。此外，我们研究了MRC 0406 - 244中发射线亮度不对称的性质：我们得出结论，这种不对称是由于电离气体质量的不对称，证实了McCarthy，van Breugel和Kapahi的情况，并导致我们拒绝Gopal-Krishna和Wiita的情况。
英文摘要：
In this letter, we investigate the nature of the dramatic `super-bubble' emission structures associated with the z=2.44 radio galaxy MRC 0406-244, using rest-frame optical spectroscopy and an archival HST NICMOS image. Based on the optical line ratios and the HST morphology, we conclude that the gas in the superbubbles is photoionized by the obscured active nucleus. We suggest that this type of structure might be related to the spatially extended HI absorbers that are detected in front of many high-z radio galaxies. We also suggest that we may be witnessing the destruction of the extended emission line region. In addition, we investigate the nature of the emission line brightness asymmetry in MRC 0406-244: we conclude that this asymmetry is due to an asymmetry in the mass of ionized gas, confirming the scenario of McCarthy, van Breugel & Kapahi, and leading us to reject that of Gopal-Krishna & Wiita.
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