An optically luminous radio galaxy at Z = 3.22 and the K-z diagram at high redshift

Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X, Rawlings, Steve, Dickinson, Mark, Spinrad, Hyron, Hill, Gary J. and Lacy, Mark 1993. An optically luminous radio galaxy at Z = 3.22 and the K-z diagram at high redshift. Astrophysical Journal 409 (2) , pp. 578-583. 10.1086/172688

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Abstract

Images of the radio galaxy 6C 1232+39 taken through the B, R, I, J, H, and K filters, taken through a narrow-band filter centered on the Ly alpha line, and made with the VLA at 5 GHz are presented. This radio galaxy is found to have a 'classical double' radio structure, unlike the other two radio galaxies with z greater than 3 that have been extensively studied. It is shown that 6C 1232+39 has a red bump in its rest-frame optical spectrum, like the other two radio galaxies with z greater than 3. Evidence is presented which shows that the scatter in the K-z diagram at z greater than 2 is greater that the scatter at z less than 2. Lastly, it is suggested that the dispersion in the K-band magnitudes of the known radio galaxies with z greater than 2 raises doubts as to the use of the K-z Hubble relation to estimate the redshifts of distant radio galaxies from K magnitudes alone.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	galactic evolution; radio galaxies; red shift; visual observation; infrared imagery; lyman alpha radiation; spectral energy distribution
Publisher:	Astrophysical Journal
ISSN:	0004-637X
Last Modified:	24 Oct 2022 11:14
URI:	https://orca.cardiff.ac.uk/id/eprint/47403

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