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Title: Forward Global Photometric Calibration of the Dark Energy Survey

Abstract

Here, 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 $${m}_{b}^{\mathrm{std}}$$ 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 $${m}_{b}^{\mathrm{std}}$$ of stellar sources over the multiyear Y3A1 data sample with residual random calibration errors of $$\sigma =6\mbox{--}7\,\mathrm{mmag}$$ per exposure. The accuracy of the calibration is uniform across the $$5000\,{\deg }^{2}$$ DES footprint to within $$\sigma =7\,\mathrm{mmag}$$. The systematic uncertainties of magnitudes in the standard system due to the spectra of sources are less than $$5\,\mathrm{mmag}$$ for main-sequence stars with $$0.5\lt g-i\lt 3.0$$.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1419989
Alternate Identifier(s):
OSTI ID: 1367897; OSTI ID: 1422477
Report Number(s):
arXiv:1706.01542; DES-2016-0190; SLAC-PUB-16987; FERMILAB-PUB-17-179-PPD
Journal ID: ISSN 1538-3881; TRN: US1801437
Grant/Contract Number:  
AC02-76SF00515; AC02-07CH11359; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Astronomical Journal (Online)
Additional Journal Information:
Journal Name: Astronomical Journal (Online); Journal Volume: 155; Journal Issue: 1; Journal ID: ISSN 1538-3881
Publisher:
IOP Publishing - AAAS
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; methods: observational; techniques: photometric; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

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., García-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. Forward Global Photometric Calibration of the Dark Energy Survey. United States: N. p., 2017. Web. doi:10.3847/1538-3881/aa9f22.
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., García-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., & Walker, A. R. Forward Global Photometric Calibration of the Dark Energy Survey. United States. doi:10.3847/1538-3881/aa9f22.
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., García-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. Thu . "Forward Global Photometric Calibration of the Dark Energy Survey". United States. doi:10.3847/1538-3881/aa9f22. https://www.osti.gov/servlets/purl/1419989.
@article{osti_1419989,
title = {Forward Global Photometric Calibration of the Dark Energy Survey},
author = {Burke, D. L. and Rykoff, E. S. and Allam, S. and Annis, J. and Bechtol, K. and Bernstein, G. M. and Drlica-Wagner, A. and Finley, D. A. and Gruendl, R. A. and James, D. J. and Kent, S. and Kessler, R. and Kuhlmann, S. and Lasker, J. and Li, T. S. and Scolnic, D. and Smith, J. and Tucker, D. L. and Wester, W. and Yanny, B. and Abbott, T. M. C. and Abdalla, F. B. and Benoit-Lévy, A. and Bertin, E. and Rosell, A. Carnero and Kind, M. Carrasco and Carretero, J. and Cunha, C. E. and D’Andrea, C. B. and da Costa, L. N. and Desai, S. and Diehl, H. T. and Doel, P. and Estrada, J. and García-Bellido, J. and Gruen, D. and Gutierrez, G. and Honscheid, K. and Kuehn, K. and Kuropatkin, N. and Maia, M. A. G. and March, M. and Marshall, J. L. and Melchior, P. and Menanteau, F. and Miquel, R. and Plazas, A. A. and Sako, M. and Sanchez, E. and Scarpine, V. and Schindler, R. and Sevilla-Noarbe, I. and Smith, M. and Smith, R. C. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Tarle, G. and Walker, A. R.},
abstractNote = {Here, 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 ${m}_{b}^{\mathrm{std}}$ 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 ${m}_{b}^{\mathrm{std}}$ of stellar sources over the multiyear Y3A1 data sample with residual random calibration errors of $\sigma =6\mbox{--}7\,\mathrm{mmag}$ per exposure. The accuracy of the calibration is uniform across the $5000\,{\deg }^{2}$ DES footprint to within $\sigma =7\,\mathrm{mmag}$. The systematic uncertainties of magnitudes in the standard system due to the spectra of sources are less than $5\,\mathrm{mmag}$ for main-sequence stars with $0.5\lt g-i\lt 3.0$.},
doi = {10.3847/1538-3881/aa9f22},
journal = {Astronomical Journal (Online)},
number = 1,
volume = 155,
place = {United States},
year = {2017},
month = {12}
}

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Figures / Tables:

Figure 1 Figure 1: Blanco/DECam instrumental passbands SDECalb measured with the DECal system. The solid color lines show the focal-plane average for g-band (green), r-band (red), i-band (blue), z-band (magenta), and Y-band (yellow). In addition one light gray line plotted for each individual CCD shows the variation in response which is especiallymore » pronounce for the g-band. The variation of the blue edge of the i-band is shown in more detail in Figure 2.« less

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