A First Look at Hot Pixels on ACS

Details A First Look at Hot Pixels on ACS A First Look at Hot Pixels on ACS

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acs..rept....6r&link_type=abstract

Instrument Science Report ACS 2002-06, 10 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

We have made an initial study of "hot" pixels on the ACS CCD's, i.e., those with elevated dark current. The characteristics of these pixels are similar to those seen on previous CCD's flown on HST and are likely caused by radiation damage. The number of new hot pixels increases each day by about 90 pixels and 1200 pixels for HRC and WFC respectively . The first two anneals for HRC healed 80% of new hot pixels, similar to what is seen with WFPC2 and STIS. The first two anneals on WFC healed only 45%-50% of hot pixels. If naively extrapolated these weak anneals would lead to ~2% of the CCD being covered by hot pixels in ~3 years (e.g., the fraction covered by cosmic rays in a 1000 second observation). An estimate of CTE from the mean hot pixel profile gives an approximation of the current CTE on WFC and HRC of 0.99999 in the parallel and serial directions.

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