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Merging galaxies and dark matter halos.

Wetzel, Andrew Rodger.

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Merging galaxies and dark matter halos.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Merging galaxies and dark matter halos./
作者:	Wetzel, Andrew Rodger.
面頁冊數:	204 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5525.
Contained By:	Dissertation Abstracts International71-09B.
標題:	Physics, Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3413520
ISBN:	9781124142203

Merging galaxies and dark matter halos.
Wetzel, Andrew Rodger.

Merging galaxies and dark matter halos. - 204 p.

Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5525.

Thesis (Ph.D.)--University of California, Berkeley, 2010.

Mergers between distinct objects are a natural part of hierarchical structure formation. Mergers are also one of the most critical elements in the evolution of both galaxies and halos. I use high-resolution, cosmological volume simulations to explore galaxy and halo evolution and merging activity in a cosmological context, including environmental dependence, merger rates and dynamics, and how these processes in halos connect with those of galaxies.

ISBN: 9781124142203Subjects--Topical Terms:

1671120
Physics, Astrophysics.

Merging galaxies and dark matter halos.
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500 $a Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5525.
500 $a Adviser: Martin White.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2010.
520 $a Mergers between distinct objects are a natural part of hierarchical structure formation. Mergers are also one of the most critical elements in the evolution of both galaxies and halos. I use high-resolution, cosmological volume simulations to explore galaxy and halo evolution and merging activity in a cosmological context, including environmental dependence, merger rates and dynamics, and how these processes in halos connect with those of galaxies.
520 $a I first explore halo merging and evolution, focusing on its interplay with large-scale environment. While halo spatial clustering has been thought to depend only on mass, I examine how spatial clustering depends on secondary parameters such as halo formation time, concentration, and recent merger history, a phenomenon known as "assembly bias". Next, I examine the extent to which close spatial pairs of objects can be used to predict mergers, finding limited utility to the pair-merger method arising from a competition between merger efficiency and completeness. I also explore the dependence of merging on environmental density, discovering that merging is less efficient in overdense environments. I then investigate how a massive galaxy/halo population at high redshift connects to a massive population of the same number density today, finding that scatter in mass growth and mergers between massive objects preclude a direct population mapping either forward or backward in time.
520 $a In the latter part of this work, I explore the dynamics and mergers of galaxies in groups and clusters. I first examine the orbital distributions of satellite halos/galaxies at the time of infall onto a more massive host halo, finding that satellite orbits become more radial and penetrate deeper at higher host halo mass and higher redshift. I then track the evolution of galaxies in groups directly, examining the merger rates of galaxies over time and finding that galaxy mergers do not simply trace halo mergers. I also examine the small-scale environments of galaxy mergers, discovering that recently merged galaxies exhibit enhanced small-scale spatial clustering for a short time after a merger. Finally, by using abundance matching to assign stellar mass to subhalos, I explore the importance of merging vs. disruption processes for satellite galaxy evolution. I rigorously test the connection of galaxies to subhalos by comparing simulations against observed galaxy spatial clustering, satellite fractions, and cluster satellite luminosity functions, finding agreement in all cases.
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710 2 $a University of California, Berkeley. $b Astrophysics. $3 1683900
773 0 $t Dissertation Abstracts International $g 71-09B.
790 1 0 $a White, Martin, $e advisor
790 1 0 $a Holzapfel, Bill $e committee member
790 1 0 $a Quataert, Eliot $e committee member
790 $a 0028
791 $a Ph.D.
792 $a 2010
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