Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-21
Astronomy and Astrophysics
Astrophysics
5 pages, 8 figures, to be published in the proceedings of 'Emission Lines from Jet Flows' Nov 2001, Mexico, Eds. W. Henney, W.
Scientific paper
In this contribution we will present deep VLT spectroscopy observations of the giant emission line halo around the z=2.49 radio galaxy MRC 2104-242. The morphology of the halo is dominated by two spatially resolved regions. Lya is extended by >12" along the radio axis, C IV and He II are extended by ~8". The overall spectrum is typical for that of high redshift radio galaxies. Interestingly, N V is present in the spectrum of the region associated with the center of the galaxy hosting the radio source, the northern region, while absent in the southern region. Using a simple photoionization model, the difference in N V can be explained due to a metallicity gradient within the halo. This is consistent with a scenario in which the halo is formed by a massive cooling flow or originates from the debris of the merging of two or more galaxies. However, also other mechanisms such as jet-cloud interactions or starburst-winds could be important.
de Breuck Carlos
Kurk Jaron
Overzier Roderik
Rottgering Huub
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