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Santana, Rebecca Accepted Dissertation SP24.pdf (20.79 MB)

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Abstract Header

Galaxy Cluster Centralization Utilizing Weak Gravitational Lensing of High Redshift, z >0.4, Galaxy Clusters

Santana, Rebecca
http://orcid.org/0009-0004-2186-0672
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1711623634142644

Abstract Details

2024, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
As more wide-angle, large-scale, all-sky surveys become available so do opportunities for significant advancements into our understanding of the Universe through the study of formation and evolution of structure and testing cosmological models. It is important to address the systematic errors of weak lensing measurements as statistical errors improve, especially those that are planned as part of an automated process such as pipelines for the Vera Rubin Observatory’s Legacy Survey of Space and Time. I obtained and analyzed images from 14 Hubble Space Telescope Advanced Camera for Surveys Wide Field Camera galaxy clusters spanning redshifts from 0.4 to 0.9 to identify potential galaxy cluster centroids and determine the optimal centroid usage based on observable indicators. I utilized the Principal Component Analysis method on individual exposures to describe the point spread function and the KSB+ method to correct the galaxy shapes and measure the shear. I then performed a bootstrap resampling analysis to identify the weak lensing centroid for each cluster. I compared this centroid with the brightest cluster galaxy (BCG), light and X-ray centroids to determine which centroid was optimal. I also searched for observable markers indicating when it is beneficial to use which centroid. My analysis of the survey suggests the BCG as the better choice of center compared to light or X-ray centroids, but is still offset from the mass centroid at a statistically significant level in a number of the clusters. I found no clear indicator within my research of an ideal centroid choice.
Douglas Clowe (Advisor)
Joseph Shields (Committee Member)
Ryan Fogt (Committee Member)
David Drabold (Committee Member)
Eric Stinaff (Committee Member)
111 p.
Astronomy; Astrophysics; Physics
galaxy clusters; gravitational lensing; weak lensing; high redshift; centralization; centroid; dark matter; cosmology; dark energy; LSST

Recommended Citations

Citations

  • Santana, R. (2024). Galaxy Cluster Centralization Utilizing Weak Gravitational Lensing of High Redshift, z >0.4, Galaxy Clusters [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1711623634142644

    APA Style (7th edition)

  • Santana, Rebecca. Galaxy Cluster Centralization Utilizing Weak Gravitational Lensing of High Redshift, z >0.4, Galaxy Clusters. 2024. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1711623634142644.

    MLA Style (8th edition)

  • Santana, Rebecca. "Galaxy Cluster Centralization Utilizing Weak Gravitational Lensing of High Redshift, z >0.4, Galaxy Clusters." Doctoral dissertation, Ohio University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1711623634142644

    Chicago Manual of Style (17th edition)

ohiou1711623634142644
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© 2024, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.