K-z relation

The K-z relation for radio galaxies

The host galaxies of powerful radio sources have a fairly small scatter in luminosity, leading to a tight relationship between their near-infrared K-band magnitudes and their radio luminosities: the `K-z relation’ or `near-infrared Hubble diagram’.

We have investigated the K-z relation for a sample of over 200 radio galaxies from completely identified low-frequency selected samples with virtually complete redshift information:

Near-infrared imaging and the K-z relation for radio galaxies in the 7C Redshift Survey
Willott C.J., Rawlings S., Jarvis M.J., Blundell K.M., 2003, MNRAS, 339, 173