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Activity Number: 445
Type: Contributed
Date/Time: Wednesday, August 6, 2008 : 2:00 PM to 3:50 PM
Sponsor: Section on Statistical Computing
Abstract - #302015
Title: Summarizing X-Ray Stellar Spectra
Author(s): Hyunsook Lee*+ and Vinay Kashyap
Companies: Harvard-Smithsonian Center for Astrophysics and Harvard-Smithsonian Center for Astrophysics
Address: 60 Garden St. MS-70, Cambridge, MA, 02138,
Keywords: X-ray stellar spectra ; dimension reduction ; hierarchical clustering ; missing data ; subspace clustering ; algorithms
Abstract:

XAtlas is a spectrum database made with the High Resolution Transmission Grating on the Chandra X-ray Observatory, after painstaking detailed emission measure analysis to extract quantified information. Here, we explore the possibility of summarizing this spectral information into relatively convenient measurable quantities via dimension reduction methods. Principal component analysis, simple component analysis, projection pursuit, independent component analysis, and parallel coordinates are employed to enhance any patterned structures embedded in the high dimensional space. We discuss pros and cons of each dimension reduction method as a part of developing clustering algorithms for XAtlas. The biggest challenge in analyzing XAtlas was handling missing values that are of astrophysical importance. This research was supported by NASA/AISRP grant NNG06GF17G and NASA contract NAS8-39073.

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