Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-10
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:20010041
We present spectroscopic observations of the rest-frame UV line emission around radio galaxy MRC 2104-242 at z=2.49, obtained with FORS1 on VLT Antu. The morphology of the halo is dominated by two spatially resolved regions. Lya is extended by >12 arcsec along the radio axis, CIV and HeII are extended by ~8 arcsec. The overall spectrum is typical for that of high redshift radio galaxies. The most striking spatial variation is that NV 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. Assuming that the gas is photoionized by a hidden quasar, the difference in NV emission can be explained by a metallicity gradient within the halo. This is consistent with a scenario in which the gas is associated with a massive cooling flow or originates from the debris of the merging of two or more galaxies.
de Breuck Carlos
Kurk Jaron
Overzier Roderik
Rottgering Huub
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