Analysis of the HST Thermal Background as Seen by NICMOS + NCS

Details Analysis of the HST Thermal Background as Seen by NICMOS + NCS Analysis of the HST Thermal Background as Seen by NICMOS + NCS

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nicm.rept....7s&link_type=abstract

Instrument Science Report NICMOS 2003-007, 26 pages

Physics

Optics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

This report describes the results from the SMOV3b and Cycle 11 thermal background calibration programs for NICMOS. The HST aft shroud is warmer due to ongoing degradation of the external MLI and increased power of the instruments installed during SM3B (ACS and the Nicmos Cooling System (NCS)). This warms the NICMOS fore-optics, affecting the thermal background in long wavelength camera 2 and camera 3 filters by approximately 20% beyond the increase due to DQE alone. This should be taken into account when planning observations with these cameras in filters longward of 1.9 microns, or in especially broad filters such as F175W in camera 3. Since camera 1 has no filters with a central wavelength longward of 1.9 microns, thermal emission effects in this camera are not an issue, and have not been studied.

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