Colloquium on 18 June 2015
The evolving relation between star-formation rate and stellar mass in the VIDEO Survey since z = 3

Details

Title: The evolving relation between star-formation rate and stellar mass in the VIDEO Survey since z = 3
Speaker: Russell Johnston (University of Western Cape)
Date: Thursday, 18 June 2015
Time: 11:00 - 12:00
Venue: SAAO Auditorium

Abstract

Quantifying the interplay between star formation and stellar mass is a crucial component to understanding the build up of galaxies over cosmic time.  There have been many investigations of this relationship, using both observations and simulations, with the aim of shedding light on how it connects with the underlying physical processes governing galaxy evolution.

In this talk I will present recent work where we have examined  the star formation rate (SFR) – stellar mass (M∗) relation of star-forming galaxies in the XMM-LSS field to z ∼ 3.0 using the near-infrared data from the VISTA Deep Extragalactic Observations (VIDEO) survey.   Combining VIDEO with broad-band photometry, we have used the SED fitting algorithm CIGALE to derive SFRs and M∗ and have adapted it to account for the full photometric redshift PDF uncertainty.  

We have also compared our results to a range of simulations where I will show that the analytical scaling relation approaches, that invoke an equilibrium model, a good fit to our data. Within a simplified framework, such a model does not include the modelling of e.g. halos, cooling, or galaxy mergers, suggesting that a continual smooth accretion regulated by continual outflows may be a key driver in the overall growth of SFGs.

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