Revealing the role of environmental and mass quenching with SAG

CORA S. A; ORSI, A.; HOUGH, T.; VEGA-MARTÍNEZ, CRISTIAN A

La Serena

Congreso; Sofía A Cora; 2018

AAA-SOCHIAS

We study the relevance of mass and environmental quenching on the star formation (SF) history of z = 0 passive satellite galaxies by analysing a galaxy catalogue generated from the combination of the semi- analytic model of galaxy formation sag and the MultiDark simulation mdpl2. We find M=10^10.5Msun to be the stellar mass scale where mass quenching becomes important. Environmental processes dominate the SF quenching of low-mass satellite galaxies (M= 10^10.1Msun). High-mass galaxies are more likely to quench as centrals, and those that remain active after first infall are mainly aaffected by mass quenching. The whole quenching process iswell described by a delay-then-fade quenching scenario. During the first phase of this two-stage process, the starformation rate of satellites declines as they were centrals in a delay time that ranges from 3 Gyr to 1 Gyrfor low-mass (M=10^10Msun) and high-mass (M=10^11Msun) satellites, respectively. During the second stage,the gas cooling rate and, consequently, the star formation rate decay more abruptly until the satellite becomespassive. The time span of this fading phase is 1 Gyr, largely independent of stellar mass.