On the Variation of Gas Depletion Time

TL;DR

This paper investigates how local galactic environments influence star formation efficiency and molecular gas depletion time in 125 nearby galaxies by combining molecular, stellar, and ionized gas data.

Contribution

It provides a comprehensive analysis of the dependence of star formation efficiency on local galactic parameters using combined multi-survey data.

Findings

Star formation efficiency varies with stellar surface density.

Metallicity influences molecular gas depletion time.

Radial dependence observed in star formation parameters.

Abstract

We present an updated status of the EDGE project, which is a survey of 125 local galaxies in the $^{12}$CO($1-0$) and $^{13}$CO($1-0$) lines. We combine the molecular data of the EDGE survey with the stellar and ionized gas maps of the CALIFA survey to give a comprehensive view of the dependence of the star formation efficiency, or equivalently, the molecular gas depletion time, on various local environments, such as the stellar surface density, metallicity, and radius from the galaxy center. This study will provide insight into the parameters that drive the star formation efficiency in galaxies at $z \sim 0$.