Two-dimensional aperture photometry - Signal-to-noise ratio of point-source observations and optimal data-extraction techniques

Details Two-dimensional aperture photometry - Signal-to-noise ratio of point-source observations and optimal data-extraction techniques Two-dimensional aperture photometry - Signal-to-noise ratio of point-source observations and optimal data-extraction techniques

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..616h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, June 1989, p. 616-622.

Statistics

Methodology

113

Apertures, Astronomical Photometry, Charge Coupled Devices, Data Processing, Point Sources, Signal To Noise Ratios, Background Radiation, Optimization, Pixels, Poisson Equation

Scientific paper

New methodology and associated software techniques for use when performing two-dimensional aperture photometry with data from areal detectors are presented. It is shown that applying simple Poisson statistics to point sources only works in certain limited regimes and that for many situations the 'CCD equation' must be employed to get accurate results. Sky or background subtraction is again found to be of critical importance and, of five background estimation methods tried, each had some difficulties in producing a 'correct' background value. CCD growth curves are introduced as a means of correcting the flux from faint or crowded sources, when measured with very small (optimum) apertures. These optimum apertures are of interest as they are shown to give large increases in S/N for point-source observations. The usage of these small apertures along with CCD growth curves is discussed and presented with emphasis on their use for time-resolved CCD photometry.

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