Evolution of Ly-alpha Emitting Galaxies in the Millennium-II Simulation
by
Jean Paul Walker(Rutgers University)
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Europe/Stockholm
FA31
FA31
Description
Using the Millennium-II Simulation dark matter sub-halo merger histories, we created mock catalogs of Lyman Alpha Emitting (LAE) galaxies at z = 3.1 to study the properties of their descendants. Several models were created by selecting the sub-halos to match the observed clustering and number density of these galaxies. We used mass-based and age-based selection criteria to study their effects on descendant populations at later times.For the models which best represent LAEs at z = 3.1, the z = 0 descendants have a median dark matter halo mass of 10^12.7 M⊙, with a wide scatter in masses (50% between 10^11.8 and 10^13.7 M⊙). Our study differentiated be- tween central and satellite sub-halos and found that ~55% of z = 0 halos host central descendants with M_Median ~10^11.9. This confirms that central z = 0 descendants of z = 3.1 LAEs have halo masses typical of L∗ type galaxies. The median descendant mass is robust to various methods of age determination, but could vary by a factor of 5 due to current observational uncertainties in the clustering of LAEs used to determine their median z = 3.1 dark matter mass.
