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

Дата и время публикации : 2011-11-28T21:37:07Z

Авторы публикации и институты :
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
Hee-Jong Seo
Melanie Simet
Brian Yanny

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 18 page, 10 figures, submitted to ApJ. Small changes in text to be consistent with revised photo-z catalog of Reis et al. arXiv:1111.6620v2
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: 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 $2.5arcdeg$ of $delta$ over $-50arcdeg le alpha le 60arcdeg$ 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 $rsim 23.5$ 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 1.1arcsec, 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.

Category: Physics