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3C 65: old galaxy or buried quasar?

Lacy, Mark, Rawlings, Steve, Eales, Stephen Anthony and Dunlop, J. S. 1995. 3C 65: old galaxy or buried quasar? Monthly Notices of the Royal Astronomical Society 273 (3) , pp. 821-826.

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3C 65 is one of the reddest known radio galaxies at z~=1. We have taken optical and near-infrared spectra, and a K-band image in an attempt to assess whether this red colour is produced by an underlying old stellar population. We find that the broad- and intermediate-band fluxes are consistent with a power-law spectrum in the optical/near-infrared, with no evidence for a 4000-A break, showing that the K-band light is dominated by a reddened quasar nucleus. By comparing the optical spectral index with the mean for optically selected quasars, we estimate an A_V~=2 towards the nucleus and an unreddened quasar magnitude of V~=19. Our spectra, however, do indicate the presence of a 4000-A break in the off-nuclear light, consistent with either a formation redshift z_f>4 for a stellar population with a standard IMF, or the presence of young supergiant stars, which we have previously argued are present in the off-nuclear knot of 3C 356.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
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Last Modified: 04 Jun 2017 05:10

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