An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data

Abstract

We present an algorithm to photometrically calibrate wide field optical imaging surveys, that simultaneously solves for the calibration parameters and relative stellar fluxes using overlapping observations. The algorithm decouples the problem of "relative" calibrations, from that of "absolute" calibrations; the absolute calibration is reduced to determining a few numbers for the entire survey. We pay special attention to the spatial structure of the calibration errors, allowing one to isolate particular error modes in downstream analyses. Applying this to the Sloan Digital Sky Survey imaging data, we achieve ~1% relative calibration errors across 8500 sq.deg. in griz; the errors are ~2% for the u band. These errors are dominated by unmodelled atmospheric variations at Apache Point Observatory. These calibrations, dubbed "ubercalibration", are now public with SDSS Data Release 6, and will be a part of subsequent SDSS data releases.

16 pages, 17 figures, matches version accepted in ApJ. These calibrations are available at http://www.sdss.org/dr6

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• Low Metallicity Galaxies from the Dark Energy Survey
• Removal of systematics in photometric measurements: static and rotating illumination corrections in FORS2@VLT data
• Photometric calibration in u-band using blue halo stars
• Bayesian large-scale structure inference: initial conditions and the cosmic web
• Improving LSST Photometric Calibration with Gaia Data
• Measurement of the evolving galaxy luminosity and mass function using clustering-based redshift inference
• The Self-Calibrating Hubble Diagram
• A proposal for relative in-flight flux self-calibrations for spectro-photometric surveys
• SDSS, LSST, and Gaia: Lessons and Synergies
• Star formation and gas in the minor merger UGC 10214
• Simultaneous Estimation of Large-Scale Structure and Milky Way Dust Extinction from Galaxy Surveys
• The Impact of Tomographic Redshift Bin Width Errors on Cosmological Probes
• Statistical Properties of Blue Horizontal Branch Stars in the Spheroid: Detection of a Moving Group approximately 50 kpc from the Sun
• Image Stacking Analysis of SDSS Galaxies with AKARI Far-Infrared Surveyor Maps at 65μm, 90μm, and 140μm
• Bayesian inference of the initial conditions from large-scale structure surveys
• Robust detection of CID double stars in SDSS
• Large-scale peculiar velocities through the galaxy luminosity function at z ~ 0.1