Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-19
Astrophys.J.674:1217-1233,2008
Astronomy and Astrophysics
Astrophysics
16 pages, 17 figures, matches version accepted in ApJ. These calibrations are available at http://www.sdss.org/dr6
Scientific paper
10.1086/524677
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.
Barentine John C.
Blanton Michael R.
Brewington Howard J.
Finkbeiner Douglas Paul
Gunn James E.
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