The Long vs. Short Anomaly in WFPC2 Images

Details The Long vs. Short Anomaly in WFPC2 Images The Long vs. Short Anomaly in WFPC2 Images

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998wfpc.rept....2c&link_type=abstract

Instrument Science Report 98-02, 22 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

We present an improved characterization of the so-called "long vs. short" anomaly, a non-linear behavior of the WFPC2 chips which results in a decrease of the measured count rate with decreasing exposure time. We demonstrate that: 1) this non-linearity depends strictly on total counts in a stellar image, and is independent of exposure time; 2) the effect depends on position on the chip only through the well-known CTE effect, and is independent of position after the CTE correction is applied; 3) F555W and F814W appear similarly affected; and 4) there is a marginal decrease in non-linearity at high background levels, but the effect is statistically insignificant in the overall description of the anomaly. We present a simple formula that can be used to correct the observed counts in a variety of conditions; this formula is recommended for use with most point-source photometry obtained with WFPC2.

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