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Duringtheexpected5+yearsofoperation,theSpitzerSpaceTelescopeisandwillcontinuetoproduceoutstand- inginfraredimagesandspectra,andgreatlyfurtherscientiflcunderstandingofouruniverse. TheSpitzerSpace Telescope's instruments are cryogenically cooled to achieve low dark current and low noise. After the cryogens are exhausted, the Spitzer Space Telescope will only be cooled by passively radiating into space. The detector arrays in the IRAC instrument are expected to equilibrate at approximately 30K. The two shortest wavelength channels(3.6 and4.5 micron)employ InSbdetectorarraysandareexpectedtofunction andperformwith only amodestdegradationinsensitivity. Thus,anextendedmissionispossibleforSpitzer. Wepresentthepredicted dark current, noise, quantum e-ciency and image residuals for the 3.6 and 4.5 micron IRAC channels in the post-cryogen era.

Spitzer space telescope: dark current and total noise prediction for InSb detector arrays in the infrared array camera (IRAC) for the post-cryogen era