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Forward Global Photometric Calibration of the Dark Energy Survey

Forward Global Photometric Calibration of the Dark Energy Survey
Forward Global Photometric Calibration of the Dark Energy Survey

Many scientific goals for the Dark Energy Survey (DES) require the calibration of optical/NIR broadband b = grizY photometry that is stable in time and uniform over the celestial sky to one percent or better. It is also necessary to limit to similar accuracy systematic uncertainty in the calibrated broadband magnitudes due to uncertainty in the spectrum of the source. Here we present a "Forward Global Calibration Method (FGCM)" for photometric calibration of the DES, and we present results of its application to the first three years of the survey (Y3A1). The FGCM combines data taken with auxiliary instrumentation at the observatory with data from the broadband survey imaging itself and models of the instrument and atmosphere to estimate the spatial and time dependences of the passbands of individual DES survey exposures. "Standard" passbands that are typical of the passbands encountered during the survey are chosen. The passband of any individual observation is combined with an estimate of the source spectral shape to yield a magnitude in the standard system. This "chromatic correction" to the standard system is necessary to achieve subpercent calibrations and in particular, to resolve ambiguity between the broadband brightness of a source and the shape of its SED. The FGCM achieves a reproducible and stable photometric calibration of standard magnitudes of stellar sources over the multiyear Y3A1 data sample with residual random calibration errors of per exposure. The accuracy of the calibration is uniform across the DES footprint to within . The systematic uncertainties of magnitudes in the standard system due to the spectra of sources are less than for main-sequence stars with .

methods: observational, Techniques: photometric
0004-6256
Burke, D. L.
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Tarle, G.
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Burke, D. L.
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Rykoff, E. S.
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Allam, S.
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Annis, J.
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Bechtol, K.
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Bernstein, G. M.
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Drlica-Wagner, A.
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Finley, D. A.
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Gruendl, R. A.
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Kent, S.
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Kessler, R.
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Kuhlmann, S.
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Tarle, G.
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Walker, A. R.
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Burke, D. L., Rykoff, E. S., Allam, S., Annis, J., Bechtol, K., Bernstein, G. M., Drlica-Wagner, A., Finley, D. A., Gruendl, R. A., James, D. J., Kent, S., Kessler, R., Kuhlmann, S., Lasker, J., Li, T. S., Scolnic, D., Smith, J., Tucker, D. L., Wester, W., Yanny, B., Abbott, T. M.C., Abdalla, F. B., Benoit-Lévy, A., Bertin, E., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Cunha, C. E., D'Andrea, C. B., Da Costa, L. N., Desai, S., Diehl, H. T., Doel, P., Estrada, J., Garcia-Bellido, J., Gruen, D., Gutierrez, G., Honscheid, K., Kuehn, K., Kuropatkin, N., Maia, M. A.G., March, M., Marshall, J. L., Melchior, P., Menanteau, F., Miquel, R., Plazas, A. A., Sako, M., Sanchez, E., Scarpine, V., Schindler, R., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G. and Walker, A. R. DES Collaboration (2018) Forward Global Photometric Calibration of the Dark Energy Survey The Astronomical Journal, 155, (1) (doi:10.3847/1538-3881/aa9f22).

Record type: Article

Abstract

Many scientific goals for the Dark Energy Survey (DES) require the calibration of optical/NIR broadband b = grizY photometry that is stable in time and uniform over the celestial sky to one percent or better. It is also necessary to limit to similar accuracy systematic uncertainty in the calibrated broadband magnitudes due to uncertainty in the spectrum of the source. Here we present a "Forward Global Calibration Method (FGCM)" for photometric calibration of the DES, and we present results of its application to the first three years of the survey (Y3A1). The FGCM combines data taken with auxiliary instrumentation at the observatory with data from the broadband survey imaging itself and models of the instrument and atmosphere to estimate the spatial and time dependences of the passbands of individual DES survey exposures. "Standard" passbands that are typical of the passbands encountered during the survey are chosen. The passband of any individual observation is combined with an estimate of the source spectral shape to yield a magnitude in the standard system. This "chromatic correction" to the standard system is necessary to achieve subpercent calibrations and in particular, to resolve ambiguity between the broadband brightness of a source and the shape of its SED. The FGCM achieves a reproducible and stable photometric calibration of standard magnitudes of stellar sources over the multiyear Y3A1 data sample with residual random calibration errors of per exposure. The accuracy of the calibration is uniform across the DES footprint to within . The systematic uncertainties of magnitudes in the standard system due to the spectra of sources are less than for main-sequence stars with .

Full text not available from this repository.

More information

Accepted/In Press date: 1 December 2017
e-pub ahead of print date: 28 December 2017
Published date: 1 January 2018
Keywords: methods: observational, Techniques: photometric

Identifiers

Local EPrints ID: 417332
URI: https://eprints.soton.ac.uk/id/eprint/417332
ISSN: 0004-6256
PURE UUID: 0c94e98e-76b5-4ddd-bdac-f74ad54018a4

Catalogue record

Date deposited: 30 Jan 2018 17:30
Last modified: 30 Jan 2018 17:30

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Contributors

Author: D. L. Burke
Author: E. S. Rykoff
Author: S. Allam
Author: J. Annis
Author: K. Bechtol
Author: G. M. Bernstein
Author: A. Drlica-Wagner
Author: D. A. Finley
Author: R. A. Gruendl
Author: D. J. James
Author: S. Kent
Author: R. Kessler
Author: S. Kuhlmann
Author: J. Lasker
Author: T. S. Li
Author: D. Scolnic
Author: J. Smith
Author: D. L. Tucker
Author: W. Wester
Author: B. Yanny
Author: T. M.C. Abbott
Author: F. B. Abdalla
Author: A. Benoit-Lévy
Author: E. Bertin
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: C. E. Cunha
Author: C. B. D'Andrea
Author: L. N. Da Costa
Author: S. Desai
Author: H. T. Diehl
Author: P. Doel
Author: J. Estrada
Author: J. Garcia-Bellido
Author: D. Gruen
Author: G. Gutierrez
Author: K. Honscheid
Author: K. Kuehn
Author: N. Kuropatkin
Author: M. A.G. Maia
Author: M. March
Author: J. L. Marshall
Author: P. Melchior
Author: F. Menanteau
Author: R. Miquel
Author: A. A. Plazas
Author: M. Sako
Author: E. Sanchez
Author: V. Scarpine
Author: R. Schindler
Author: I. Sevilla-Noarbe
Author: M. Smith
Author: R. C. Smith
Author: M. Soares-Santos
Author: F. Sobreira
Author: E. Suchyta
Author: G. Tarle
Author: A. R. Walker

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