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 |
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 |
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Date Type: | Publication |
Status: | Published |
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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