An algorithm for precise aperture photometry of critically sampled images

An algorithm for precise aperture photometry of critically sampled images

We present an algorithm for performing precise aperture photometry on critically sampled astrophysical images. The method is intended to overcome the small-aperture limitations imposed by point sampling. Aperture fluxes are numerically integrated over the desired aperture, with sinc interpolation us...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2013-05, Vol.431 (2), p.1275-1285
Hauptverfasser: Bickerton, S. J., Lupton, R. H.
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Lupton, R. H.
description We present an algorithm for performing precise aperture photometry on critically sampled astrophysical images. The method is intended to overcome the small-aperture limitations imposed by point sampling. Aperture fluxes are numerically integrated over the desired aperture, with sinc interpolation used to reconstruct values between pixel centres. Direct integration over the aperture is computationally intensive, but the integrals in question are shown to be convolution integrals and can be computed 10 000 times faster as products in the wavenumber domain. The method works equally well for annular and elliptical apertures and could be adapted for any geometry. A sample of code is provided to demonstrate the method.
doi_str_mv 10.1093/mnras/stt244
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subjects Algorithms
Astrophysics
Integrals
Integration
Interpolation
title An algorithm for precise aperture photometry of critically sampled images
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