Abbas, Ummi
(2006)
The Environmental dependence of Dark Matter and Galaxy Clustering.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
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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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | Sheth, Ravi K | shethrk@sas.upenn.edu | | | | Committee CoChair | Turnshek, David A | turnshek@quasar.phyast.pitt.edu | TURNSHEK | | | Committee Member | Connolly, Andrew J | | | | | Committee Member | Naples, Donna | | | | | Committee Member | Croft, 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: |
http://etd.library.pitt.edu/ETD/available/etd-04272006-130006/, etd-04272006-130006 |
| Date Deposited: |
10 Nov 2011 19:42 |
| Last Modified: |
15 Nov 2016 13:42 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/7679 |
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