The Evolution of the Baryonic Tully-Fisher Relation over the past 6 Gyr

TL;DR

This study investigates how the relationship between galaxy mass and rotation velocity has changed over the last 6 billion years, revealing evolution in stellar mass but stability in baryonic mass relations.

Contribution

It presents the first measurement of the baryonic Tully-Fisher relation at high redshift and compares its evolution to the stellar mass relation, providing new insights into galaxy evolution.

Findings

Significant evolution in stellar mass TFR zero point and scatter.

Baryonic TFR shows no significant zero point evolution.

Most gas converted into stars was already bound to galaxies at z=0.6.

Abstract

Scaling relations are salient ingredients of galaxy evolution and formation models. I summarize results from the IMAGES survey, which combines spatially-resolved kinematics from FLAMES/GIRAFFE with imaging from HST/ACS and other facilities. Specifically, I will focus on the evolution of the stellar mass and baryonic Tully-Fisher Relations (TFR) from z=0.6 down to z=0. We found a significant evolution in zero point and scatter of the stellar mass TFR compared to the local Universe. Combined with gas fractions derived by inverting the Schmidt-Kennicutt relation, we derived for the first time a baryonic TFR at high redshift. Conversely to the stellar mass TFR, the baryonic relation does not appear to evolve in zero point, which suggests that most of the reservoir of gas converted into stars over the past 6 Gyr was already gravitationally bound to galaxies at z=0.6.