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Astron. Astrophys. 351, 47-58 (1999)

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6. Summary and conclusions

We have studied the UV spectra of 3 high redshift radio galaxies and the hyperluminous system SMM J02399-0136. All objects present extended continuum and line emission along the radio axis. Several spatial components are found in all objects.

The line ratios of the active galaxy (L1) in the system SMM J02399-0136 and the radio galaxy MRC2025-218 suggest that the emission line spectra are dominated by the intermediate density narrow line region ([FORMULA] cm-3), rather than the low density more extended gas ([FORMULA]100 cm-3). This could also be the case for other HzRG.

We find that MRC2025-218 and L1 show unusually strong NV, inconsistent with solar abundance model predictions. Comparison with studies of high redshift quasars and radio galaxies suggest that N is overabundant in both objects. An alternative possibility for L1 is that NV is emitted in a more nucleated region and is more amplified by the gravitational lens. An alternative possibility for MRC2025-218 is that emission from the broad line region contaminates the NV line.

We detect several absorption features in the continuum of MRC2025-218. No pure photospheric features have been identified unambiguously. We observe PCygni profiles in some of the lines. The nature of the absorption is not clear. It could be due to stars or to associated absorption systems, as observed in other HzRG.

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© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999