Status and Performance of HST/Wide Field Camera 3

Computer Science – Performance

Scientific paper

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Scientific paper

Wide Field Camera 3 (WFC3) is a powerful UV/visible/near-infrared camera currently in development for installation into the Hubble Space Telescope during upcoming Servicing Mission 4. WFC3 provides two imaging channels. The UVIS channel incorporates a 4096 × 4096 pixel CCD focal plane with sensitivity from 200 to 1000 nm and a 160 × 160 arcsec field of view. The UVIS channel features unprecedented sensitivity and field of view in the near ultraviolet for HST, as well as a rich filter set that complements the visible capabilities of the HST/Advanced Camera for Surveys (whose repair will be attempted in the Servicing Mission). It will be particularly well suited for studies of the star formation history of local galaxies and clusters, searches for Lyman alpha dropouts at moderate redshift, and searches for low surface brightness structures against the dark UV sky background. The IR channel features a 1024 × 1024 pixel HgCdTe focal plane covering 850 to 1700 nm with a 139 × 123 arcsec field of view, providing a major advance in IR survey efficiency for HST. IR channel science goals include the study of galaxy formation at high redshift, dark energy research through the discovery and monitoring of high-redshift supernovae standard candles, and star formation investigations. The instrument is being prepared for launch as part of HST Servicing Mission 4, currently scheduled for August 2008. We report here on the status and performance of WFC3, including highlights of an extensive system-level thermal-vacuum test carried out in the summer/fall of 2007.

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