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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 225900.0, MPI für Astronomie / Publikationen_mpia
Correcting spatial gradients
Authors:Koch, A.; Grebel, E. K.; Odenkirchen, M.; Caldwell, J. A. R.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:The Messenger
Volume:115
Start Page:37
End Page:39
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present a method to significantly reduce
large-scale photometric variations seriously
affecting imaging data from the Wide Field Imager
(WFI). The primary source for these gradients is
non-uniform illumination, which cannot be
corrected by standard flatfielding techniques.
Comparison of our observations with
well-calibrated multi-colour photometry from the
SDSS enabled us to characterize and quantify
these variations and finally to model them using
a second-order polynomial. Application of the
model to our observations and an independent
dataset consistently reduced the large-scale
gradients and thus provides a generally valid
and simple tool for improving WFI photometry.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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