The FIRST radio survey: The K-z diagram of FIRST radio sources identified in the Boötes and Cetus fields

Abstract

This paper presents the Hubble diagram (K-z relation) for FIRST (Faint Images of the Radio Sky at 20 cm) radio sources identified in the Bootes and Cetus fields. The correlation between the K magnitude of the FIRST-NDWFS sample and the photometric redshifts found to be linear. The dispersion about the best fit line is given by 1.53 for the whole sample and 0.75 at z>1. The paper also presents a composite K-z diagram of FIRST radio sources and low-frequency selected radio samples with progressively fainter flux-density limits (3CRR, 6C, 7CRS and the EIS-NVSS sample). The majority of FIRST radio sources lie fainter than the no evolution curve (3L* galaxies) probably highlighting the fact that the galaxy luminosity is correlated with the radio power.

7 pages, 4 figures and 1 table. Accepted for publiation in Astronomische Nachrichten

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• A new search for distant radio galaxies in the Southern hemisphere -- III. Optical spectroscopy and analysis of the MRCR--SUMSS sample
• A Combined EIS-NVSS Survey Of Radio Sources II: Infrared imaging and the K-z relation
• The 6C** sample of steep-spectrum radio sources: II - Redshift distribution and the space density of high-redshift radio galaxies