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Title: ASSESSMENT OF SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION IN LARGE-AREA SKY SURVEYS

Abstract

Meeting the science goals for many current and future ground-based optical large-area sky surveys requires that the calibrated broadband photometry is both stable in time and uniform over the sky to 1% precision or better. Past and current surveys have achieved photometric precision of 1%–2% by calibrating the survey’s stellar photometry with repeated measurements of a large number of stars observed in multiple epochs. The calibration techniques employed by these surveys only consider the relative frame-by-frame photometric zeropoint offset and the focal plane position-dependent illumination corrections, which are independent of the source color. However, variations in the wavelength dependence of the atmospheric transmission and the instrumental throughput induce source color-dependent systematic errors. These systematic errors must also be considered to achieve the most precise photometric measurements. In this paper, we examine such systematic chromatic errors (SCEs) using photometry from the Dark Energy Survey (DES) as an example. We first define a natural magnitude system for DES and calculate the systematic errors on stellar magnitudes when the atmospheric transmission and instrumental throughput deviate from the natural system. We conclude that the SCEs caused by the change of airmass in each exposure, the change of the precipitable water vapor and aerosol inmore » the atmosphere over time, and the non-uniformity of instrumental throughput over the focal plane can be up to 2% in some bandpasses. We then compare the calculated SCEs with the observed DES data. For the test sample data, we correct these errors using measurements of the atmospheric transmission and instrumental throughput from auxiliary calibration systems. The residual after correction is less than 0.3%. Moreover, we calculate such SCEs for Type Ia supernovae and elliptical galaxies and find that the chromatic errors for non-stellar objects are redshift-dependent and can be larger than those for stars at certain redshifts.« less

Authors:
; ; ; ; ;  [1]; ; ; ; ; ; ;  [2]; ;  [3];  [4]; ;  [5]; ;  [6] more »; « less
  1. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)
  2. Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
  3. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
  4. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104 (United States)
  5. SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States)
  6. Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena (Chile)
Publication Date:
OSTI Identifier:
22663014
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (Online)
Additional Journal Information:
Journal Volume: 151; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; AEROSOLS; ASTROPHYSICS; CALIBRATION; COLOR; CORRECTIONS; FREQUENCY DEPENDENCE; GALAXIES; ILLUMINANCE; NONLUMINOUS MATTER; PHOTOMETRY; RED SHIFT; SKY; SUPERNOVAE; VARIATIONS; WATER VAPOR

Citation Formats

Li, T. S., DePoy, D. L., Marshall, J. L., Boada, S., Mondrik, N., Nagasawa, D., Tucker, D., Annis, J., Finley, D. A., Kent, S., Lin, H., Marriner, J., Wester, W., Kessler, R., Scolnic, D., Bernstein, G. M., Burke, D. L., Rykoff, E. S., James, D. J., Walker, A. R., Collaboration: DES Collaboration, and others, and. ASSESSMENT OF SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION IN LARGE-AREA SKY SURVEYS. United States: N. p., 2016. Web. doi:10.3847/0004-6256/151/6/157.
Li, T. S., DePoy, D. L., Marshall, J. L., Boada, S., Mondrik, N., Nagasawa, D., Tucker, D., Annis, J., Finley, D. A., Kent, S., Lin, H., Marriner, J., Wester, W., Kessler, R., Scolnic, D., Bernstein, G. M., Burke, D. L., Rykoff, E. S., James, D. J., Walker, A. R., Collaboration: DES Collaboration, & others, and. ASSESSMENT OF SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION IN LARGE-AREA SKY SURVEYS. United States. doi:10.3847/0004-6256/151/6/157.
Li, T. S., DePoy, D. L., Marshall, J. L., Boada, S., Mondrik, N., Nagasawa, D., Tucker, D., Annis, J., Finley, D. A., Kent, S., Lin, H., Marriner, J., Wester, W., Kessler, R., Scolnic, D., Bernstein, G. M., Burke, D. L., Rykoff, E. S., James, D. J., Walker, A. R., Collaboration: DES Collaboration, and others, and. Wed . "ASSESSMENT OF SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION IN LARGE-AREA SKY SURVEYS". United States. doi:10.3847/0004-6256/151/6/157.
@article{osti_22663014,
title = {ASSESSMENT OF SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION IN LARGE-AREA SKY SURVEYS},
author = {Li, T. S. and DePoy, D. L. and Marshall, J. L. and Boada, S. and Mondrik, N. and Nagasawa, D. and Tucker, D. and Annis, J. and Finley, D. A. and Kent, S. and Lin, H. and Marriner, J. and Wester, W. and Kessler, R. and Scolnic, D. and Bernstein, G. M. and Burke, D. L. and Rykoff, E. S. and James, D. J. and Walker, A. R. and Collaboration: DES Collaboration and others, and},
abstractNote = {Meeting the science goals for many current and future ground-based optical large-area sky surveys requires that the calibrated broadband photometry is both stable in time and uniform over the sky to 1% precision or better. Past and current surveys have achieved photometric precision of 1%–2% by calibrating the survey’s stellar photometry with repeated measurements of a large number of stars observed in multiple epochs. The calibration techniques employed by these surveys only consider the relative frame-by-frame photometric zeropoint offset and the focal plane position-dependent illumination corrections, which are independent of the source color. However, variations in the wavelength dependence of the atmospheric transmission and the instrumental throughput induce source color-dependent systematic errors. These systematic errors must also be considered to achieve the most precise photometric measurements. In this paper, we examine such systematic chromatic errors (SCEs) using photometry from the Dark Energy Survey (DES) as an example. We first define a natural magnitude system for DES and calculate the systematic errors on stellar magnitudes when the atmospheric transmission and instrumental throughput deviate from the natural system. We conclude that the SCEs caused by the change of airmass in each exposure, the change of the precipitable water vapor and aerosol in the atmosphere over time, and the non-uniformity of instrumental throughput over the focal plane can be up to 2% in some bandpasses. We then compare the calculated SCEs with the observed DES data. For the test sample data, we correct these errors using measurements of the atmospheric transmission and instrumental throughput from auxiliary calibration systems. The residual after correction is less than 0.3%. Moreover, we calculate such SCEs for Type Ia supernovae and elliptical galaxies and find that the chromatic errors for non-stellar objects are redshift-dependent and can be larger than those for stars at certain redshifts.},
doi = {10.3847/0004-6256/151/6/157},
journal = {Astronomical Journal (Online)},
issn = {1538-3881},
number = 6,
volume = 151,
place = {United States},
year = {2016},
month = {6}
}

Works referencing / citing this record:

Producing a BOSS CMASS sample with DES imaging
journal, September 2019

  • Lee, S.; Huff, E. M.; Ross, A. J.
  • Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 2
  • DOI: 10.1093/mnras/stz2288

Producing a BOSS CMASS sample with DES imaging
journal, September 2019

  • Lee, S.; Huff, E. M.; Ross, A. J.
  • Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 2
  • DOI: 10.1093/mnras/stz2288