HST WFC3 IR channel: 1k x 1k HgCdTe detector, QE 80% 18 micron pixels (0.13”/pix), ~2’x2’ FOV Detector sensitivity engineered to cut off above 1.7 micron, so can operate at -128 C (6-stage thermoelectric cooler) without thermal noise from telescope and detector. J (1.1 micron) and H (1.6 microns) bands. Dominant background: zodiacal light: 0.6-1.3 e/s/pix Sensitivity: J=27 (ABmag, S/N=5) in 45 min (point src.), 1.4 hr (1” diam src.) H=26.4 53 min 1.5 hr Sensitivity: J=26 (ABmag, S/N=5) in 10 min (point src.), 18min (1” diam. src.) H=25.4 12 min 19min
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HST WFC3 IR channel: 1k x 1k HgCdTe detector, QE 80% 18 micron pixels (0.13”/pix), ~2’x2’ FOV Detector sensitivity engineered to cut off above 1.7 micron,
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HST WFC3 IR channel:
1k x 1k HgCdTe detector, QE 80%
18 micron pixels (0.13”/pix), ~2’x2’ FOV
Detector sensitivity engineered to cut off above 1.7 micron, so can operate at -128 C (6-stage thermoelectric cooler) without thermal noise from telescope and detector.