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The reddened quasar 3C 22 and its implications

Rawlings, Steve, Lacy, Mark, Sivia, D. S. and Eales, Stephen Anthony 1995. The reddened quasar 3C 22 and its implications. Monthly Notices of the Royal Astronomical Society 274 (2) , pp. 428-434.

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We prove the presence of a broad (apx-}5000 km 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 A_V~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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Wiley-Blackwell
ISSN: 0035-8711
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Last Modified: 04 Jun 2017 05:08

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