Computer Science
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acs..rept....1m&link_type=abstract
Instrument Science Report ACS 2005-13, 32 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Sbc Flatfields
Scientific paper
The uniformity of the SBC detector response has been assessed using multiple observations of the globular cluster NGC6681. By placing the same stars over different portions of the detector and measuring relative changes in brightness, low-frequency variations in the detector response (L-flats) have been derived and used to create improved SBC flatfields for the FUV imaging filters. Corrections to the flatfields used by the ACS calibration pipeline are to percent, where the required correction increases with wavelength. A time-dependent component has also been measured, suggesting a decline in the absolute UV sensitivity of ~2 to 4 percent in the first 1.6 years on-orbit. Since that time, the ACS sensitivity appears to have stabilized. Six new flatfields have been delivered for use in the calibration pipeline, and the resulting photometric accuracy is now % for F115LP F122M, F125LP, and F140LP and % for F150LP and F165LP, after correcting for both the new L-flats and the time-dependent sensitivity. Further development to the ACS pipeline is required before the new sensitivity corrections can be applied.
Bohlin Ralph
Gilliland Ron
Mack Jennifer
van der Marel Roeland
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