Berti: Testing Galaxy Assembly Bias with PRIMUS / Groh: Electronics for precision cosmology: challenges in multiplexed readout of large detector arrays with the Simons Array CMB polarization experiment

Oct 29, 2019 - 11:00 am to 12:00 pm

Campus, Varian 355

Angela Berti (UCSD) / John Groh (UC Berkeley)

Berti:  The "halo model" of galaxy evolution assumes all properties of a galaxy are determined statistically by the mass of its dark matter halo. While this assumption yields predictions that largely agree with observations, the full picture of the connection between galaxies and halos is incomplete without assembly bias. Probes of galaxy assembly bias include galactic conformity and the differential clustering of star-forming and quiescent central galaxies at fixed stellar mass. I will show that two-halo galactic conformity may not be a real effect, and demonstrate that efforts to refine galaxy evolution models should instead focus on correlations between halo accretion rate and galaxy properties like star formation rate.