The effects of seeing on Sérsic profiles - II. The Moffat PSF

Bibcode
2001MNRAS.328..977T
DOI
10.1046/j.1365-8711.2001.04937.x
Trujillo, I.; Aguerri, J. A. L.; Cepa, J.; Gutiérrez, C. M.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 328, Issue 3, pp. 977-985.

Advertised on:
12
2001
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
4
IAC number of authors
3
Citations
160
Refereed citations
147
Description
The effects of seeing on Sérsic r1/n profile parameters are extensively studied using a Moffat function. This analytical approximation to the point spread function (PSF) is shown to provide the best fit to the PSF predicted from atmospheric turbulence theory when β~4.765. The Moffat PSF is additionally shown to contain the Gaussian PSF as a limiting case (β->∞). The Moffat function is also shown to be numerically well behaved when modelling narrow PSFs in HST images. Seeing effects are computed for elliptically symmetric surface brightness distributions. The widely used assumption of circular symmetry when studying the effects of seeing on intrinsically elliptical sources is shown to produce significant discrepancies with respect to the true effects of seeing on these sources. A prescription to correct raw (observed) central intensities, effective radii, index n and mean effective surface brightness is given.
Type
Refereed
Atmospheric effects
Methods
Galaxies
Photometry

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