Asymmetric Star Formation Efficiency Due to Ram Pressure Stripping

CONTRERAS, SERGIO; LAGOS, CLAUDIA; TRONCOSO IRIBARREN, PAULINA; RODRIGUEZ, SILVIO; PADILLA, NELSON; GARCIA-LAMBAS, DIEGO

Galaxies

Stefano Ettori and Dominique Eckert

Lugar: Basel; Año: 2016 vol. 4

Previous works have shown that a dense cluster environment affects satellite galaxyproperties and accelerates or truncates their evolutionary processes. In this work, we use the EAGLEsimulation to study this effect, dissecting the galaxies in two halves: the one that is falling directlyto the cluster (leading half) and the one behind (trailing half). Considering all galaxies within thevirial radius of the most massive groups and clusters of the simulation (Mhalo > 1013.8[M]), we findthat on average the leading half presents an enhancement of the star formation rate with respect tothe trailing half. We conclude that galaxies falling into the intra-cluster medium experience a boostin star-formation in their leading half due to ram pressure. Sparse observations of jellyfish galaxieshave revealed visually the enhancement of the star formation in the leading half. In order to confirmthis effect statistically using observations, different cases must be investigated using the simulationas a test dataset