Journal
ASTROPHYSICAL JOURNAL
Volume 674, Issue 2, Pages 1217-1233Publisher
IOP PUBLISHING LTD
DOI: 10.1086/524677
Keywords
techniques : photometric
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We present an algorithm to photometrically calibrate wide-field optical imaging surveys, which 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 SDSS imaging data, we achieve similar to 1% relative calibration errors across 8500 deg(2) in griz; the errors are similar to 2% for the u band. These errors are dominated by unmodeled atmospheric variations at Apache Point Observatory. These calibrations, dubbed uber-calibration,'' are now public with SDSS Data Release 6 and will be a part of subsequent SDSS data releases.
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