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A calibration map for Wide Field Imager photometry

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A calibration map for Wide Field Imager photometry. / Koch, Andreas; Odenkirchen, Michael; Grebel, E.K. et al.
In: Astronomical Notes / Astronomische Nachrichten, Vol. 325, No. 4, 08.12.2003, p. 299-306.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Koch, A, Odenkirchen, M, Grebel, EK & Caldwell, JAR 2003, 'A calibration map for Wide Field Imager photometry', Astronomical Notes / Astronomische Nachrichten, vol. 325, no. 4, pp. 299-306. https://doi.org/10.1002/asna.200310176

APA

Koch, A., Odenkirchen, M., Grebel, E. K., & Caldwell, J. A. R. (2003). A calibration map for Wide Field Imager photometry. Astronomical Notes / Astronomische Nachrichten, 325(4), 299-306. https://doi.org/10.1002/asna.200310176

Vancouver

Koch A, Odenkirchen M, Grebel EK, Caldwell JAR. A calibration map for Wide Field Imager photometry. Astronomical Notes / Astronomische Nachrichten. 2003 Dec 8;325(4):299-306. doi: 10.1002/asna.200310176

Author

Koch, Andreas ; Odenkirchen, Michael ; Grebel, E.K. et al. / A calibration map for Wide Field Imager photometry. In: Astronomical Notes / Astronomische Nachrichten. 2003 ; Vol. 325, No. 4. pp. 299-306.

Bibtex

@article{90b714395fa74f1a89fad5c56c69fc2b,
title = "A calibration map for Wide Field Imager photometry",
abstract = "We present a prescription to correct large-scale intensity variations affecting imaging data taken with the Wide Field Imager (WFI) at the MPG/ESO 2.2 m telescope at the European Southern Observatory at La Silla in Chile. Such smoothly varying, large-scale gradients are primarily caused by non-uniform illumination due to stray light, which cannot be removed using standard flatfield procedures. By comparing our observations to the well-calibrated, homogeneous multicolour photometry from the Sloan Digital Sky Survey we characterise the intensity gradients across the camera by secondorder polynomials. The application of these polynomials to our data removes the gradients and reduces the overall scatter.We also demonstrate that applying our correction to an independent WFI dataset significantly reduces its large-scale variations, indicating that our prescription provides a generally valid and simple tool for calibrating WFI photometry.",
author = "Andreas Koch and Michael Odenkirchen and E.K. Grebel and Caldwell, {John A. R.}",
year = "2003",
month = dec,
day = "8",
doi = "10.1002/asna.200310176",
language = "English",
volume = "325",
pages = "299--306",
journal = "Astronomical Notes / Astronomische Nachrichten",
issn = "0004-6337",
publisher = "Wiley",
number = "4",

}

RIS

TY - JOUR

T1 - A calibration map for Wide Field Imager photometry

AU - Koch, Andreas

AU - Odenkirchen, Michael

AU - Grebel, E.K.

AU - Caldwell, John A. R.

PY - 2003/12/8

Y1 - 2003/12/8

N2 - We present a prescription to correct large-scale intensity variations affecting imaging data taken with the Wide Field Imager (WFI) at the MPG/ESO 2.2 m telescope at the European Southern Observatory at La Silla in Chile. Such smoothly varying, large-scale gradients are primarily caused by non-uniform illumination due to stray light, which cannot be removed using standard flatfield procedures. By comparing our observations to the well-calibrated, homogeneous multicolour photometry from the Sloan Digital Sky Survey we characterise the intensity gradients across the camera by secondorder polynomials. The application of these polynomials to our data removes the gradients and reduces the overall scatter.We also demonstrate that applying our correction to an independent WFI dataset significantly reduces its large-scale variations, indicating that our prescription provides a generally valid and simple tool for calibrating WFI photometry.

AB - We present a prescription to correct large-scale intensity variations affecting imaging data taken with the Wide Field Imager (WFI) at the MPG/ESO 2.2 m telescope at the European Southern Observatory at La Silla in Chile. Such smoothly varying, large-scale gradients are primarily caused by non-uniform illumination due to stray light, which cannot be removed using standard flatfield procedures. By comparing our observations to the well-calibrated, homogeneous multicolour photometry from the Sloan Digital Sky Survey we characterise the intensity gradients across the camera by secondorder polynomials. The application of these polynomials to our data removes the gradients and reduces the overall scatter.We also demonstrate that applying our correction to an independent WFI dataset significantly reduces its large-scale variations, indicating that our prescription provides a generally valid and simple tool for calibrating WFI photometry.

U2 - 10.1002/asna.200310176

DO - 10.1002/asna.200310176

M3 - Journal article

VL - 325

SP - 299

EP - 306

JO - Astronomical Notes / Astronomische Nachrichten

JF - Astronomical Notes / Astronomische Nachrichten

SN - 0004-6337

IS - 4

ER -