Galaxy Clustering and the galaxy-halo connection in the Deep Multi-Wavelength Surveys

Peter Hatfield from Oxford Univeristy will present the NASSP Colloquim, with a talk entitled, "Galaxy Clustering and the galaxy-halo connection in the Deep Multi-Wavelength Surveys"

Deep wide-field surveys are an important probe of the main galaxy scaling relations and the role of environment from the peak of star formation to today, with it increasingly becoming crucial to take advantage of surveys at multiple wavelengths to get the most from the data.  The VISTA Deep Extragalactic Observations (VIDEO) Survey is a key such survey for understanding galaxies on a cosmological scale and probing the 'epoch of activity', when galaxies virialised within their dark matter halos and the majority of star-formation and AGN behaviour occurred. Observing in Z, Y, J, H,K over 12 sq degrees (with fields chosen for the availability of multiband data) and up to z~4, VIDEOs depth and breadth allows both large-scale structure as well as evolution inside individual dark matter halos to be probed up to very early times. We present a series of results from using a clustering analysis to investigate the connection between the galaxies and the host dark matter halo in the first data release of VIDEO. We use the survey to study a variety of galaxy evolutionary processes and environmental effects up to z$\sim$1 and beyond using a halo occupation distribution (HOD) methodology, allowing us to track how stellar mass builds up in different halos over cosmic time. Furthermore we explore how quenching mechanisms can be introduced into the HOD formalism to track exactly where and when quenching occurs within a halo.

Tuesday, August 2, 2016 - 16:15

MAM111, Mathematics Building, Upper Campus, UCT