The dynamics of satellite and dark matter halo interactions on galaxy formation and evolution

2007 2007

Other formats: Order a copy

Abstract (summary)

In my thesis, I research four consequences of satellite and dark matter halo interaction on galaxy formation.

First, I investigate detailed physical processes in interaction between satellites and dark matter halos using analytic perturbation theory calculations and N-body simulations. The results suggest that resonant dynamics is a responsible physical mechanism for satellite-halo interaction. Comparison of different resolution simulations demonstrates that some resonances requires a larger number of halo particle to be reproduce and a low resolution simulation fails to do so. My results show two interesting physical processes in the satellite-dark matter halo interaction: significant dark matter halo central cusp excursion and effects of dark matter halo responses influence on a satellite decay rate.

Second, I investigate detailed physical processes of satellite disruption in cold dark matter host halos using idealized N-body simulations. The simulation results show that the satellite heating by resonant interactions with its host halo is important. This resonant effect appears in two distinct types: resonant shock and resonant torque. Simulation results also show that the pattern of satellite stripping is outside-in process in energy space. Based on our simulation results, I suggest a new crude analytic estimation of satellite mass loss.

Third, I study the evolution of satellite dark matter halos due to the interaction with cold dark matter subhalos by comparing simulations of the satellite evolution in halos with and without subhalos. According to my results, the satellites in the halo with subhalo lose more mass than the satellites in the smooth halo. The results also suggest that close encounter with subhalos is a more efficient way to satellite destruction. Satellite dark matter halo responses due to the interaction with the host halo and the subhalos produce a symmetric distortion.

Fourth, I investigate the dynamical mechanisms responsible for producing tidal tails from dwarf satellites using N-body simulations. Using N-body simulations I identify two important dynamical co-conspirators: (1) the satellite deformation shows asymmetric distortion; (2) the satellite tail is continuously affected by satellite gravity. These two dynamical mechanisms significantly influence expected tidal tail morphology.

Indexing (details)

0606: Astronomy
0606: Astrophysics
Identifier / keyword
Pure sciences; Dark matter; Galaxy formation; Satellite-halo interactions
The dynamics of satellite and dark matter halo interactions on galaxy formation and evolution
Choi, Jun-Hwan
Number of pages
Publication year
Degree date
School code
DAI-B 68/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Weinberg, Martin D.; Katz, Neal
Committee member
Mo, Houjun; Traschen, Jennie
University of Massachusetts Amherst
University location
United States -- Massachusetts
Source type
Dissertations & Theses
Document type
Dissertation/thesis number
ProQuest document ID
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.