Upper limits on K-band polarization in three high-redshift radio galaxies: 53W091, 3C 441 and MRC 0156-252

Leyshon, G., Dunlop, J. S. and Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X 1999. Upper limits on K-band polarization in three high-redshift radio galaxies: 53W091, 3C 441 and MRC 0156-252. Monthly Notices of the Royal Astronomical Society 309 (2) , pp. 474-480. 10.1046/j.1365-8711.1999.02842.x

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Abstract

We present the results of K-band imaging polarimetry of three radio galaxies, including the very red and apparently old z=1.55 galaxy 53W091. We find weak evidence for polarization in components of 3C 441 and in the south-eastern companion of 53W091, but no evidence of significant polarization in 53W091 itself. We also find strong evidence that MRC 0156-252 is unpolarized. We present upper limits for the K-band polarization of all three sources. For 53W091, the lack of significant K-band polarization provides further confidence that its red R−K colour can be attributed to a mature stellar population, consistent with the detailed analyses of its ultraviolet spectral-energy distribution which indicate a minimum age of 2–3.5 Gyr.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	polarization; galaxies: active; galaxies: individual: LBDS 53W091 galaxies: individual: MRC 0156-252; galaxies: individual: 3C 441; infrared: galaxies
ISSN:	0035-8711
Last Modified:	24 Oct 2022 11:11
URI:	https://orca.cardiff.ac.uk/id/eprint/47241

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