Colloquium on 26 February 2015
Effects of the stochastic growth of angular momentum on the star formation rate

Details

Title: Effects of the stochastic growth of angular momentum on the star formation rate
Speaker: Nelson Padilla (PUC Chile)
Date: Thursday, 26 February 2015
Time: 11:00 - 12:00
Venue: SAAO Auditorium

Abstract

Dark matter (DM) haloes, the cradles where galaxies form and evolve, acquire angular momentum in a stochastic way which results in a final non-zero DM adimensional spin parameter.  We will see how this process translates into the ability of the galaxy, living in this DM halo, to form stars.  To do this we will first measure this stochasticity from the Millennium II simulation, and then see how it affects the properties of the disc of baryons that forms in the center of a DM halo using a semi-analytic model.  We will see that the smooth infall of matter comes in chunks with almost, but not quite, random angular momenta, which affects the ability of a disc to form stars and also the frequency of instabilities in the disc leading to the formation of bars and pseudo-bulges, constituting discs which are more episodic in nature.

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