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The Environmental dependence of Dark Matter and Galaxy Clustering

Abbas, Ummi (2006) The Environmental dependence of Dark Matter and Galaxy Clustering. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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We have addressed important astrophysical issues of the large scale structure of the universewith the help of analytical and numerical tools. In particular, we have concentrated on obtaininga better understanding of the environmental dependence of clustering of dark matter and galaxies.We will discuss the development of the analytical framework, the generation of mock catalogs of data, and present results from numerical studies of the comparison of the theory with the simulated data samples and subsequently with actual observational data.The N-body simulations from the Virgo consortium and SDSS data were used to study the clusteringproperties of dense and less dense subsamples with the help of the correlation function.The dense sample shows a correlation function that is about a factor of ten times or more higher than the less dense sample at large scales. This discernible difference holds true for mock galaxies, dark matter, and data from the Sloan Digital Sky Survey.By utilizing the halo model and adapting the formalism to different environments, we present the correspondence between theoretical models and simulated samples and real data.The strong agreement between the model and results from simulations and data provides strong support for the hierarchical clustering models. This suggests that unless care is taken to study galaxies at fixed halo mass, observed correlations between gastrophysical effects and environment are dominated by the fact that these effects also correlate with the halo mass, and halo mass correlates with environment.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSheth, Ravi
Committee CoChairTurnshek, David Aturnshek@quasar.phyast.pitt.eduTURNSHEK
Committee MemberConnolly, Andrew J
Committee MemberNaples, Donna
Committee MemberCroft, Rupert A C
Date: 20 September 2006
Date Type: Completion
Defense Date: 13 April 2006
Approval Date: 20 September 2006
Submission Date: 27 April 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Analytical methods; Dark Matter; Galaxies; Large Scale Structure
Other ID:, etd-04272006-130006
Date Deposited: 10 Nov 2011 19:42
Last Modified: 15 Nov 2016 13:42


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