Statistics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1344s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1344-1353, 1701.
Statistics
15
Astronomical Photography, Radio Galaxies, Star Distribution, Stellar Luminosity, Image Analysis, Photographic Plates, Power Spectra, Statistical Analysis
Scientific paper
Deep R- and B-band photographic plates of NGC 5128, obtained under photometric conditions at the f/3.3 prime focus of the AAT 3.9 m telescope, clearly show surface brightness fluctuations from the luminous, stellar population. We exploit the distinct statistical properties of photographic plates when compared with CCDs to provide an independent analysis of the luminosity fluctuations. The threshold and saturation levels of a detector skew the statistics at both extremes. Our model successfully accounts for the first three statistical moments of the photographic grain response measured from the density wedges on the photographic plates. After removing the grain noise component, the derived form of the power spectrum for the seeing-convolved luminosity fluctuations is in good agreement with those of Tonry and Schechter (1990) in the V and I bands. In the R band, we determine a value of 3.84 +/- 1.1 Mpc for the distance to NGC 5128. Although less accurate, our approach constitutes a statistically independent test and therefore provides strong support for Tonry's luminosity fluctuation distance method.
Bland-Hawthorn Jonathan
Malin David F.
Shopbell Patrick Lynn
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