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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

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.

preprint2009arXivOpen access
A. HumphreyF. IwamuroM. Villar-MartinL. BinetteE. C. Sung
astro-ph.CO
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Open access5 authors1 topic
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A. HumphreyF. IwamuroM. Villar-MartinL. BinetteE. C. Sung

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