Photometric Calibrations of Standard Star Fields for the Dark Energy Survey
Abstract
The Dark Energy Survey (DES) is a 5000 square deg grizY imaging survey to be conducted using the new 3 square deg (2. 2-diameter) wide-field mosaic camera (DECam) on the CTIO Blanco 4-m telescope. The primary scientific goal of the DES is to constrain dark energy cosmological parameters via four complementary methods: galaxy cluster counting, weak lensing, galaxy angular correlations, and Type Ia supernovae, supported by precision photometric redshifts. Here, we describe code developed to calibrate additional standard star fields in the DES natural grizY system, and we describe our initial results using the data obtained during the DES Science Verification Phase. Some of these standard stars will be used to supplement those currently being used for nightly calibrations. Others are to be used as local tertiary standards scattered throughout the DES footprint in order to anchor the DES global relative calibrations against large-scale spatial gradients, as well as to tie the whole DES data set to an initial absolute flux scale.
- Publication:
-
American Astronomical Society Meeting Abstracts #223
- Pub Date:
- January 2014
- Bibcode:
- 2014AAS...22325413W