The SDSS Coadd: 275 deg^2 of Deep SDSS Imaging on Stripe 82
James Annis, Marcelle Soares-Santos, Michael A. Strauss, Andrew C., Becker, Scott Dodelson, Xiaohui Fan, James E. Gunn, Jiangang Hao, Zeljko, Ivezic, Sebastian Jester, Linhua Jiang, David E. Johnston, Jeffrey M. Kubo,, Hubert Lampeitl, Huan Lin, Robert H. Lupton, Gajus Miknaitis

TL;DR
This paper details the creation and characterization of a deep, wide-area coadded imaging dataset from SDSS Stripe 82, reaching 2 magnitudes deeper than single-pass data, enabling various astrophysical analyses.
Contribution
It introduces a comprehensive method for constructing, calibrating, and modeling the PSF of a deep coadded SDSS dataset covering 275 deg$^2$, with detailed validation and potential applications.
Findings
Median seeing of 1.1 arcsec in r-band
Calibration accuracy within 1%
Good PSF modeling suitable for precision photometry
Abstract
We present details of the construction and characterization of the coaddition of the Sloan Digital Sky Survey Stripe 82 \ugriz\ imaging data. This survey consists of 275 deg of repeated scanning by the SDSS camera of of over centered on the Celestial Equator. Each piece of sky has runs contributing and thus reaches magnitudes fainter than the SDSS single pass data, i.e. to for galaxies. We discuss the image processing of the coaddition, the modeling of the PSF, the calibration, and the production of standard SDSS catalogs. The data have -band median seeing of 1.1\arcsec, and are calibrated to . Star color-color, number counts, and psf size vs modelled size plots show the modelling of the PSF is good enough for precision 5-band photometry. Structure in the psf-model vs magnitude plot…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
