Answers are grounded in this paper and cite their sources.
We prove the presence of a broad (|≈ 5000 s⁻¹|) Hα emission line in the spectrum of the |$z=0.935$| ‘radio galaxy’ 3C 22. This confirms suspicions that some of the faint red objects classified as high-redshift radio galaxies are actually slightly reddened quasars. Using our WHT and UKIRT spectra, we estimate a rest-frame extinction towards the quasar of |AV~2|. We review the difficulties involved in detecting broad emission lines in high-redshift radio galaxies, concluding that, if one wishes to discover the origin of the observed near-infrared light, then near-infrared spectroscopy is a very limited technique. We argue that a programme of thermal imaging is likely to prove far more fruitful.
No takes yet. Share an insight, caveat, or question.
Rawlings et al. (1995) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: