Oral Presentation

Molecular gas scaling relations and morphology in quenched galaxies

Author(s): Lapo Fanciullo, Tamkang University, Department of Physics Hsi-An Pan, Tamkang University, Department of Physics Lihwai Lin, Academia Sinica Institute of Astronomy and Astrophysics JINGLE team, Academia Sinica Institute of Astronomy and Astrophysics

Presenter: Lapo Fanciullo (Tamkang University)

Star formation is a fundamental process driving galaxy evolution. To understand how galaxies grow and transform, it is essential to study systems spanning a wide range of star formation activity. Moreover, since stars form from molecular gas, the properties of molecular gas also play an essential role in regulating galaxy evolution.

In this work, we compile molecular gas measurements traced by CO emission from the JCMT large programs JINGLE and JINGLE II, with the addition of published data from the xCOLD GASS, EDGE-CALIFA, ALMaQUEST, MASCOT and VERTICO surveys. This combined dataset yields a sample of more than 1,000 galaxies with molecular gas measurements, covering the full range of star formation regimes: from actively star-forming main-sequence galaxies to green valley galaxies, and to quiescent systems in which star formation has been quenched.

The sample is further enriched by extensive ancillary data, including detailed morphological classifications. This unique combination allows us to connect molecular gas properties to galaxy structure and to identify the underlying physical mechanisms that regulate or suppress star formation during galaxy evolution. Such a comprehensive, quantitative analysis has not been possible with previous studies limited to much smaller samples.