A First Look at Cosmic Rays on ACS

Details A First Look at Cosmic Rays on ACS A First Look at Cosmic Rays on ACS

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acs..rept....7r&link_type=abstract

Instrument Science Report ACS 2002-07, 13 pages

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

We have made an initial study of the characteristics of cosmic ray impacts on the two ACS imaging cameras, HRC and WFC. The fraction of pixels affected by cosmic rays varies from 1.5% to 3% during a 1000 second exposure for both cameras, similar to what was seen on WFPC2 and STIS. The electron deposition due to individual cosmic rays has a well defined cut-off with negligible events of less than 500 electrons and a median of ~1000 electrons. The distribution of the number of pixels affected by a single cosmic ray is strongly peaked at 4 pixels. Distributions of sizes and anisotropies are determined for both cameras, characteristics which can be useful for distinguishing cosmic rays from astrophysical sources in a single image.

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