Linearity and High Signal-to-Noise Performance of the STIS CCD

Details Linearity and High Signal-to-Noise Performance of the STIS CCD Linearity and High Signal-to-Noise Performance of the STIS CCD

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111.1009g&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 762, pp. 1009-1020.

Astronomy and Astrophysics

Astronomy

12

Instrumentation: Detectors, Methods: Data Analysis, Techniques: Photometric

Scientific paper

On-orbit data characteristics of the Space Telescope Imaging Spectrograph (STIS) CCD aboard the Hubble Space Telescope have been explored with early calibrations in a number of limiting conditions. At a gain of 4 e^- DN^-1, STIS CCD data show excellent linearity at high count levels, even for extreme oversaturation of individual central pixels. At low count levels we interpret a position- and intensity-dependent nonlinearity in terms of charge transfer (in)efficiency in the parallel clocking direction and provide a simple model that accounts for this. A short time series of spectra was acquired at short-exposure times and high signal-to-noise ratio (S/N) on the binary system alpha Cen A and B enabling the shutter repeatability to be quantified at 0.0002 s. A direct demonstration of near-Poisson-limited time series with S/N>3000 is shown.

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