Absolute Flux Calibration of STIS Imaging Modes
Abstract
The absolute flux calibration of STIS imaging photometry presents a number of unique challenges. The very wide wavelength coverage of most STIS imaging modes leads to significant color dependence in both the throughputs and the aperture corrections, complicating the determination of detector sensitivity. For CCD imaging modes, these difficulties are further complicated by the very broad scattered light halo at long wavelengths. For MAMA imaging modes, it is also necessary to take the time and wavelength dependent sensitivity changes of the detectors into account. We present deep imaging observations of a number of stars with well measured spectral energy distributions. These data have been used to derive improved color dependent aperture corrections for all STIS imaging configurations, and to revise the wavelength dependent detector sensitivities. These new aperture corrections and sensitivity revisions should allow absolute flux calibration of imaging observations with better than 5% accuracy for most STIS imaging modes.
- Publication:
-
HST Calibration Workshop : Hubble after the Installation of the ACS and the NICMOS Cooling System
- Pub Date:
- 2003
- Bibcode:
- 2003hstc.conf..201P