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ETD Abstract Container

Abstract Header

Improving accuracy in gravitational weak lensing measurements of clusters

Young, Julia Cheek
http://rave.ohiolink.edu/etdc/view?acc_num=osu1376662645

Abstract Details

2013, Doctor of Philosophy, Ohio State University, Physics.
Measuring the distribution of galaxy clusters provides a powerful constraint on cosmological parameters. Currently, the largest challenge for using the observed abundance of clusters to constrain cosmology is to measure their mass accurately. The best tool to measure the mass of clusters is weak gravitational lensing, which measures the baryonic and dark matter present in galaxy clusters by observing the distortion of the shape of sources behind the gravitational lens called shear. Weak lensing measurements are technically challenging to measure due to the distortion in the shape of sources from the atmosphere and telescope optics called the Point Spread Function or PSF. To measure shear, images are processed by various software programs called lensing pipelines which correct for the distortion due to the PSF. Using image simulations with sources of known characteristics and known shear the systematic error of different lensing pipelines can be compared. In this dissertation the results of the Cluster Shear TEsting Program (CSTEP), a test of lensing pipelines on simulated images, is presented. CSTEP was developed to accurately measure the systematic bias on weak lensing measurements of clusters expected by the Dark Energy Survey (DES). The systematic error from lensing pipelines is then used to predict the error on mass measurements of galaxy clusters observed by DES.
Klaus Honscheid (Advisor)
119 p.
Physics
gravitational weak lensing; Dark Energy Survey; galaxy clusters

Recommended Citations

Citations

  • Young, J. C. (2013). Improving accuracy in gravitational weak lensing measurements of clusters [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376662645

    APA Style (7th edition)

  • Young, Julia. Improving accuracy in gravitational weak lensing measurements of clusters. 2013. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1376662645.

    MLA Style (8th edition)

  • Young, Julia. "Improving accuracy in gravitational weak lensing measurements of clusters." Doctoral dissertation, Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376662645

    Chicago Manual of Style (17th edition)

osu1376662645
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© 2013, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.