The Performance of PSF Centering Techniques

Details The Performance of PSF Centering Techniques The Performance of PSF Centering Techniques

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4010l&link_type=abstract

American Astronomical Society, DPS meeting #41, #40.10

Astronomy and Astrophysics

Astronomy

Scientific paper

The interpretation of a range of astronomical photometric data depends on an accurate and consistent centering of the photometric point spread function (PSF). Applying appropriate centering techniques to collected data captures more signal in a photometric aperture which improves the signal to noise ratio, thus producing better results for any given observational period. To this end three centering techniques, fitting a Gaussian, center of light, and least asymmetry, were tested against synthetic photometric point spread functions. Testing was also conducted on signals that are shaped in a Gaussian distribution. Each of the tested signals have realistic levels of noise and photometric gain applied, the photometric gain representing the actual number of photons received. The results from these centering techniques were then compared to the known centers with sub pixel accuracy. Three dimensional plots show which techniques perform best under various gains and signal to noise ratios.

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