University of Cambridge > > Galaxies Discussion Group > The details in the DEVILS: Exploring the co-evolution of galaxies and halos over the last 8 billion years

The details in the DEVILS: Exploring the co-evolution of galaxies and halos over the last 8 billion years

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Over the past two decades large galaxy evolution-focused surveys (such as SDSS , 2dfGRS, GAMA ) have unequivocally changed our view of the local Universe in terms of large-scale structure, the astrophysical processes occurring within galaxies and the effect of environment on galaxy properties. However, it is not the processes occurring today which forged the z 0 Universe, but the factors which drove galaxy evolution and structure formation over the proceeding 12 billion years. 

At intermediate redshifts (0.3 < z < 1.0 – the last 3-8 billion years) many of these local relations were forged: roughly half of all stars were born, galaxies underwent significant mass, size and morphology evolution, environmental trends evolved dramatically and Lambda-CDM predicts a strong and testable evolution of the halo mass function. However, this key epoch in the formation of the z0 Universe has been left largely unexplored due to the lack of the high completeness spectroscopic samples required to both determine structure on sub-Mpc scales (groups/pairs/mergers) and to remove complex selection biases when forming a spectroscopic sample.

Here I introduce the Deep Extragalactic VIsible Legacy Survey (DEVILS - a new large program with the Anglo Australian Telescope, which will probe 60,000 galaxies to Y-mag < 21.2 over 6deg2 all with exisiting/upcoming extensive multi-wavelength data from x-ray to low frequency radio. Uniquely, DEVILS will reach the high levels of completeness (>90%) previously only obtainable in the local Universe (i.e. GAMA /SDSS) allowing us to directly relate the evolution of galaxy properties with the multi-scale environment in which they reside. DEVILS will also construct the first robust and complete (to 1013Msun) group catalogue to z0.8, providing a stringent constraints of the evolution of the high mass end of the halo mass function; a strong test for Lambda-CDM.

Finally, I will discuss future prospects with ESO -4MOST’s Wide Area VISTA Extragalactic Survey Deep (WAVES-deep - which, in the next decade, will probe to a similar depths as DEVILS but cover 15 times the area; targeting 1 million galaxies at 0.2 < z < 1.0.

This talk is part of the Galaxies Discussion Group series.

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