Building the WFC3 Photometric Flux Calibration Ladder
Abstract
We describe the calibration program for the Wide Field Camera 3 (WFC3) and present results to date. The goal of the Photometric Flux Calibration Ladder is to provide increased accuracy of the zeropoint measurements, improve characterization of photometric uncertainties, provide high accuracy color corrections as well as monitor sensitivity trends in both the UVIS and NIR channels. Our aim is to develop the calibration flux ladder from the brightest standard star(s) to the faintest to improve the absolute photometric calibration and cross-calibration of the observing modes now available for grism spectroscopy and direct imaging, i.e. traditional stare mode and the recently implemented spatial scanning mode. The source list consists of stars observed with STIS, ACS, NICMOS, SPITZER/IRAC, and some of the proposed JWST calibration standards. Brightness spans the range from V ~0 mag to V=18 mag. Stellar spectral types include white dwarfs, A, G, as well as K, L and M.
- Publication:
-
American Astronomical Society Meeting Abstracts #221
- Pub Date:
- January 2013
- Bibcode:
- 2013AAS...22134412D