Insights into Galaxy Formation from z=15 to the Present Day
Peter Behroozi



We show that the ratio of galaxies' specific star formation rates to their host halos' specific mass accretion rates strongly constrains how the galaxies' stellar masses, specific star formation rates, and host halo masses evolve over cosmic time. This evolutionary constraint provides a simple way to probe z>8 galaxy populations without direct observations, and predicts that JWST should see galaxies above 108 Msun even to z=15. We also discuss using close galaxy pairs as a probe for major halo mergers at very low redshifts (z<0.05). We find no evidence that the recent halo formation history influences the quenched fraction of L* galaxies at z=0, though we do find intriguing SFR enhancement signatures for star-forming hosts.