K-Z relation

The K-z relation for radio galaxies

• a tight relationship between their near-infrared K-band magnitudes and their radio luminosities
• host galaxies of powerful radio sources have a fairly small scatter in luminosity
• leading to the `K-z relation’ or `near-infrared Hubble diagram’
• http://astroherzberg.org/people/chris-willott/research/k-z-relation/