Scientific Impact of the Operating Temperature for NFIRAOS on TMT
NRC Herzberg Institute of Astrophysics,
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2 TMT Observatory, 2632 E. Washington Blvd, Pasadena, CA 91107, USA
3 Dept. of Physics and Astronomy, 6224 Agricultural Rd., UBC, Vancouver B.C., V6T 1Z1, CANADA
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We present the scientific gain enjoyed by client instruments when NFIRAOS is cooled. If NFIRAOS is cooled to -24 °C, the background contribution of NFIRAOS will not exceed 15% of the background from sky plus TMT (for a telescope build to current requirements on Mauna Kea). If cooled further to -30 °C, the K-band inter-OH background-limited exposure times could decrease by more than 7%. We evaluate these gains achieved by cooling NFIRAOS in light of increased technical risks and costs.
© Owned by the authors, published by EDP Sciences, 2010