Properties of z=0 Descendants of z=3.1 Lyman Alpha Emitters in the Millennium Simulation

Details Properties of z=0 Descendants of z=3.1 Lyman Alpha Emitters in the Millennium Simulation Properties of z=0 Descendants of z=3.1 Lyman Alpha Emitters in the Millennium Simulation

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541016w&link_type=abstract

American Astronomical Society, AAS Meeting #215, #410.16; Bulletin of the American Astronomical Society, Vol. 42, p.237

Astronomy and Astrophysics

Astronomy

Scientific paper

We modeled Ly Alpha Emitting (LAE) galaxies at z\sim 3.1 by selecting dark matter halos in the Millenium-II Simulation to match the observed number density, halo masses and stellar ages reported in MUSYC images of the Extended Chandra Deep Field South by Gawiser et al. 2007 (ApJ 671, 278). The Millennium-II Simulation's improved mass resolution allows us to study halos with dark matter masses comparable to LAEs at z 3.1. Mass-based models were created to match the median dark matter mass, \log(Mmed)=10.9 Msun calculated from the bias factor of observed LAEs. They also preserve the observed LAE number density, 1.5E-3 Mpc-3. The age-based models were created using various definitions of halo ages applied to all halos with M\geq 5E10 Msun. We measured the 2-point autocorrelation function of the model LAE samples to confirm that they matched the observed clustering properties (r0 3.6 Mpc while holding γ =1.8). We report the descendants at z 2.1, z 1 and z=0. All of our models give median z=0 descendant masses around the dark matter mass of L* galaxies. We quantify the uncertainty in descendant masses caused by observational uncertainty in the z 3.1 bias factor by creating two additional models based around the +-1 sigma values of the median mass while preserving the number density. The z=0 descendant median masses are factors of \sim seven higher and lower for the +1 sigma and -1 sigma models, illustrating that current observational uncertainties in LAE clustering are the dominant source of uncertainty in the properties of their present-day descendants. Future LAE surveys such as HETDEX will greatly reduce the uncertainty in the median LAE mass to better determine their descendants.
We gratefully acknowledge funding support from NSF, DOE and NASA.

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