Astronomy and Astrophysics – Astronomy
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phdt.........6p&link_type=abstract
Ph.D. Thesis Pennsylvania Univ., Philadelphia.
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Digital Data, Spectrum Analysis, Energy Distribution, Fast Fourier Transformations, Power Spectra
Scientific paper
An analytical method is presented for extracting spatial information from digitized images of extended objects on astronomical plates by using two-dimensional spectral analysis. The fast Fourier transform (FFT) is used to obtain power spectra and a test, based on the Chi-squared distribution of a random variable, is used to determine the significance level in these spectra and automatically reject contributions falling below this level. The raw data, intermediate images, and power spectra are displayed via contour maps. For additional clarity the power spectra are also presented in perspective view. Power spectra of intensity image arrays give the observed energy distribution as a function of spatial frequency while spectral peaks are used to identify and quantify statistically preferred dimensions and orientations. Two regions in NGC 1976, selected for their clearly different structural appearance, were analyzed using this method.
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