![]()
© Anastasia Ponomareva
The baryonic Tully-Fisher relation (bTFr) is one of the most fundamental scaling relations of spiral galaxies which connects its baryonic mass to their Dark Matter content. However, not much is known about its evolution with cosmic time. Using the Early Science data from the MIGHTEE-HI survey, an international group of astronomers, including ASTRON astronomers, studied the evolution of the HI baryonic Tully Fisher relation over the last billion years for the first time taking advantage of the spatially resolved HI kinematics. We found no evidence that the bTFr has evolved and all galaxies in our sample are consistent with the same relation independent of redshift and the rotational velocity measure. Our results set up a reference for all future studies of the HI-based bTFr as a function of redshift that will be conducted with the ongoing deep SKA pathfinders surveys.
MIGHTEE-HI is the HI emission project within the MIGHTEE survey, currently being carried out with the newly commissioned MeerKAT radio telescope. This is one of the first deep, blind, medium-wide interferometric surveys for neutral hydrogen ever undertaken and it will extend our knowledge of HI emission to z = 0.6.
More information can be found in these papers https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stab2654/6371905 and https://www.aanda.org/articles/aa/abs/2021/02/aa39655-20/aa39655-20.html
© Anastasia Ponomareva