Effective radii of annuli in surface photometry

Details Effective radii of annuli in surface photometry Effective radii of annuli in surface photometry

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..999k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Aug. 1988, p. 999, 1000.

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Computation

5

Astronomical Photometry, Brightness, Computational Astrophysics, Elliptical Galaxies, Galaxies, Globular Clusters, Star Clusters

Scientific paper

When surface photometry is done in concentric annuli, there is a tendency toward distortion of the true profile because of the finite widths of the annuli. This distortion can be avoided by choosing an effective radius for the annulus such that the actual surface brightness at that radius is equal to the average surface brightness over the annulus. This effective radius depends on the shape of the radial profile, but its calculation can be performed in an iterative way. Formulas for the effective radius are given for some typical profile shapes.

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