The reddened quasar 3C 22 and its implications

Details The reddened quasar 3C 22 and its implications The reddened quasar 3C 22 and its implications

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..428r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 2, pp. 428-434.

Astronomy and Astrophysics

Astronomy

37

Dust, Extinction, Galaxies: Active, Galaxies: Evolution, Quasars: General, Quasars: Individual: 3C22, Infrared: Galaxies

Scientific paper

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.

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