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SUMMARY:The Merger Times of High Redshift Dark Matter Halos - Thomas McCav
 ana (Sydney)
DTSTART:20100825T121500Z
DTEND:20100825T124500Z
UID:TALK25550@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:Dynamical friction is thought to have a significant influence 
 on the merger times for Dark Matter Halos(DMHs) and galaxies alike. Approx
 imations of DMH merger times are often used in semi-analytical methods to 
 estimate important quantities such as gas abundances\, AGN activation rate
 s as well as black hole binary formation and merger rates. Recent works ha
 ve sought to tighten approximations of DMH merger times through both numer
 ical and analytical approaches. In our work we use a high resolution (mass
  resolution of 705\,000 solar masses) cosmological n-body simulation to me
 asure the merger times for DMH mergers between redshifts z=10 to z=1. We f
 ollow the satellite haloes particles checking for bound subsets in subsequ
 ent snapshots. We find mergers that begin at high redshifts finish faster 
 then those starting at low redshifts. Halo potentials at high redshifts ar
 e to some extent dynamic\, constantly growing and changing via accretion\,
  mergers and tidal interactions.
LOCATION:Sackler Lecture Theatre\, IoA
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