Course content
Gas flows in and out galaxies play a fundamental role in galaxy formation and evolution. Galaxies are not isolated entities, they live in the environment from which they formed and the interaction with this environment is a main driver for their evolution. The interplay between galaxies and their environment is the subject of this course.
Topics covered: need for gas accretion, observational evidence of accretion, gas outside galaxies, impact of accretion on star formation and galaxy evolution; hot and cold mode of accretion, missing baryons, data vs simulations; outflows from galaxies, galactic fountains and winds, impact of outflow on galaxy evolution; models of supernova feedback, data vs simulations.

Suggested reviews
Sancisi, Fraternali, Oosterloo, & van der Hulst, Cold gas accretion, 2008, A&ARv, 15, 189
Vielleux, Cecil, & Bland-Hawthorn, Galactic winds, 2005, ARA&A, 769, 43
Tumlinson et al., The Circumgalactic medium, 2017, ARA&A, 55, 389