Pierre Gratier

 

Star formation in chemically young Local Group galaxies

J. Braine

 

The Local Group variety of galaxies enables the study of the interstellar medium and star formation under conditions different from those found in the Milky Way, while retaining a good spatial resolution due to their proximity. I will present results combining large scale sensitive surveys of the molecular and atomic gas, and the infrared dust emission of two Local Group sub-metallic galaxies, M33 and NGC6822. Two features stand out for these environments: the H2-to-CO conversion factor is higher than in the Milky Way and the star formation efficiency is greater than in local universe large spirals. I will also present results concerning the Giant Molecular Cloud (GMC) properties in these environments. From the molecular gas observations, we derive the largest catalog of GMCs in an external galaxy. From this large sample, we highlight a change of the cloud mass function with galactocentric radius and a classification of clouds by star formation properties.