The Sloan Digital Sky Survey extended point spread functions

Abstract

A robust and extended characterization of the point spread function (PSF) is crucial to extract the photometric information produced by deep imaging surveys. Here, we present the extended PSFs of the Sloan Digital Sky Survey (SDSS), one of the most productive astronomical surveys of all time. By stacking ~1000 images of individual stars with different brightness, we obtain the bidimensional SDSS PSFs extending over 8 arcmin in radius for all the SDSS filters(u, g, r, i, z). This new characterization of the SDSS PSFs is near a factor of 10 larger in extension than previous PSFs characterizations of the same survey. We found asymmetries in the shape of the PSFs caused by the drift scanning observing mode. The flux of the PSFs is larger along the drift scanning direction. Finally, we illustrate with an example how the PSF models can be used to remove the scattered light field produced by the brightest stars in the central region of the Coma cluster field. This particular example shows the huge importance of PSFs in the study of the low-surface brightness Universe, especially with the upcoming of ultradeep surveys, such as the Large Synoptic Survey Telescope (LSST). Following a reproducible science philosophy, we make all the PSF models and the scripts used to do the analysis of this paper publicly available (snapshot v0.5-0-g62d83df).

Minor corrections of editor included. Available PSFs at http://cdsarc.u-strasbg.fr/viz-bin/cat/J/MNRAS/491/5317. This paper is fully reproducible, see instructions at https://gitlab.com/infantesainz/sdss-extended-psfs-paper, and in Zenodo at https://doi.org/10.5281/zenodo.3524937

References in corpus (7)

• The NumPy array: a structure for efficient numerical computation
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• Imfit: A Fast, Flexible New Program for Astronomical Image Fitting
• The influence of diffuse scattered light I. The PSF and its role to observations of the edge-on galaxy NGC 5907
• The influence of diffuse scattered light II. Observations of galaxy haloes and thick discs and hosts of BCGs
• Point spread function tails and the measurements of diffuse stellar halo light around edge-on disc galaxies

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