Evolution of the infrared Tully-Fisher relation up to z = 1.4

The Tully-Fisher relation between the rotational velocity and luminosity of spiral galaxies represents a connection between total mass and the mass locked in stars. The authors studied its evolution with redshift by comparing optical and infrared photometry with the spectroscopy of optical lines, at low and high redshift. The main result is that galaxies were brighter in the past for the same rotation velocity. Also their color was bluer, most certainly because of the star formation increase with z between 0 and 1.25. In addition, they conclude that spiral galaxies could have doubled their stellar masses in the past 8.6 Gyr.