Present-day Descendants of z=3.1 Lyα Emitting Galaxies In The Millennium-II Halo Merger Trees

Details Present-day Descendants of z=3.1 Lyα Emitting Galaxies In The Millennium-II Halo Merger Trees Present-day Descendants of z=3.1 Lyα Emitting Galaxies In The Millennium-II Halo Merger Trees

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934010w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #340.10

Astronomy and Astrophysics

Astronomy

Scientific paper

We use the Millennium-II N-body simulation to study the z=0 descendants of Lyman Alpha Emitters (LAEs) at z=3.1. The N-body simulations present us with the possibility to study galaxy evolution using dark matter halo merger trees. Several models for connecting LAEs with their host dark matter halos are used to produce mock catalogs of galaxies at z=3.1 that have clustering bias matching the measured bias of z=3.1 LAEs. The merger trees then give us the dark matter masses of the descendants at z=2.1, z=1 and z=0. We find that our model LAEs’ median halo mass increases from 1010.9 Msun at z=3.1 to 1011.3 Msun at z=2.1, 1011.9 Msun at z=1 and 1012.7 Msun at z=0. The uncertainty in the median halo mass at z=0 due to the uncertainty in the measured z=3.1 bias is a factor of seven. The simulated median halo masses at z=2.1 suggest that the typical z=3.1 LAE evolves into an LAE at z=2.1. The median present-day descendant of our mock catalogs has a dark matter halo mass a few times higher than an L* galaxy, but for the 55% of descendant halos that are central rather than satellite galaxies, the median dark matter halo mass is close to that of the Milky Way.

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