Modeling of point spread functions for astronomical multifiber spectrographs

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Title Modeling of point spread functions for astronomical multifiber spectrographs
Publication Type thesis
School or College College of Engineering
Department Electrical & Computer Engineering
Author Pandey, Parul
Date 2011-12
Description This thesis presents an improved method for reconstructing the spectra of astronomical objects from two-dimensional (2D) charge-coupled device (CCD) images. We address two issues, namely, estimation of calibration matrix for a CCD, and reconstruction of spectra of astronomical objects, which is referred to as extraction. In the rst part of the thesis we estimate the elements of system calibration matrix by modeling the two-dimensional point-spread functions (PSF) in calibration images. Our PSF model is valid for arbitrarily complicated 2D point-spread functions, as compared to the state-of-art extraction methods which are valid only for class of separable PSFs. We present various models for PSFs and give a quantitative comparison between the models. In the second part of the thesis the system calibration matrix is used to extract the spectra of a particular type of calibration images called arc-images. We also address the issue of resolution and covariance in the extracted spectra, and present a method that establishes optimal properties in both these regards. We also compare quantitatively the performance of our extraction technique with the state-of-art extraction technique. The work presented in this thesis can be deployed for estimation of spectra of faint galaxies in presence of strong night-sky foregrounds.
Type Text
Publisher University of Utah
Subject Point spread functions; SDSS III; Spectro perfectionism; Astronomical spectroscopy
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Parul Pandey 2011
Format application/pdf
Format Medium application/pdf
Format Extent 3,433,016 bytes
Identifier us-etd3,66063
Source Original in Marriott Library Special Collections, QB3.5 2011 .P36
ARK ark:/87278/s6vx0x8b
Setname ir_etd
ID 194684
Reference URL https://collections.lib.utah.edu/ark:/87278/s6vx0x8b
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