WFC3: IR Detector On-Orbit Performance

Details WFC3: IR Detector On-Orbit Performance WFC3: IR Detector On-Orbit Performance

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546318h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #463.18; Bulletin of the American Astronomical Society, Vol. 42, p.497

Astronomy and Astrophysics

Astronomy

Scientific paper

Using data taken during Servicing Mission Observatory Verification (SMOV4), we have characterized dark current and readnoise behavior of the IR Channel, along with its level of measured background signal. Using data taken in June and July of 2009, we find the dark current in the IR channel to be 0.043 - 0.050 e-/s/pixel. The correlated double sampling (CDS) read noise in RAPID sequences is 20-22 electrons, similar to that measured in ground testing. The effective noise measured in an image created from 16 reads of a SPARS200 ramp is 11.6 - 12.7 electrons. Using internal flat field images, we measured the inverse gain to be 2.28 - 2.47 ± 0.04 e-/ADU, depending on quadrant. The ratio of the mean instrumental irradiance (ADU/s/pixel) measured on orbit to that obtained in ground testing is 1.06 - 1.07, indicating a brightening of the Tungsten lamp on orbit. We also note the continued appearance of cosmic ray-like sources, dubbed "snowballs", in on orbit data.

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