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The SDSS Coadd: 275 deg$^2$ of Deep SDSS Imaging on Stripe 82

Journal Article · · Astrophys.J.
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [2];  [1];  [3];  [6];  [5];  [1];  [1];  [7];  [1];  [1];  [8];  [9];  [1]
  1. Fermilab
  2. Princeton U.
  3. Washington U., Seattle, Astron. Dept.
  4. Fermilab; Chicago U., KICP
  5. Arizona U., Astron. Dept. - Steward Observ.
  6. Fermilab; Unlisted, DE
  7. Fermilab; Portsmouth U.
  8. UC, Berkeley
  9. Chicago U., KICP
+ Show Author Affiliations
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$^2$ of repeated scanning by the SDSS camera of $$2.5\arcdeg$$ of $$\delta$$ over $$-50\arcdeg \le \alpha \le 60\arcdeg$$ centered on the Celestial Equator. Each piece of sky has $$\sim 20$$ runs contributing and thus reaches $$\sim2$$ magnitudes fainter than the SDSS single pass data, i.e. to $$r\sim 23.5$$ 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 $$r$$-band median seeing of 1.1\arcsec, and are calibrated to $$\le 1%$. 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 show minor psf mis-modelling that leads to a region where stars are being mis-classified as galaxies, and this is verified using VVDS spectroscopy. As this is a wide area deep survey there are a variety of uses for the data, including galactic structure, photometric redshift computation, cluster finding and cross wavelength measurements, weak lensing cluster mass calibrations, and cosmic shear measurements.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
SDSS
DOE Contract Number:
89243024CSC000002
OSTI ID:
2511026
Report Number(s):
FERMILAB-PUB-11-627-A-AE-CD-PPD; arXiv:1111.6619; oai:inspirehep.net:1079332
Journal Information:
Astrophys.J., Journal Name: Astrophys.J. Vol. 794
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS