Correcting spatial gradients:the case of Wide Field Imager photometry

Koch, Andreas and Grebel, E. K. and Odenkirchen, Michael and Caldwell, John A. R. (2004) Correcting spatial gradients:the case of Wide Field Imager photometry. The Messenger, 115. pp. 37-39. ISSN 0722-6691

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Abstract

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.

Item Type: Journal Article
Journal or Publication Title: The Messenger
Departments: Faculty of Science and Technology > Physics
ID Code: 83670
Deposited By: ep_importer_pure
Deposited On: 15 Dec 2016 16:30
Refereed?: No
Published?: Published
Last Modified: 11 Jun 2019 04:06
URI: https://eprints.lancs.ac.uk/id/eprint/83670

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