For the first time, we use the CO Tully-Fisher relation and a Bayesian statistical method to show the dramatic evolution in gas content of star-forming galaxies, confirming previous result that galaxies were much more gaseous billions of years ago.

The study has been published on the Astrophysical Journal Letters: The Gas Fraction Evolution of Star-Forming Galaxies Traced by The CO Tully Fisher Relation (2018ApJ…869L..37I)