Guiding JWST: Assessing The Transformations Of GSC-II Into The NIR With CFHT WIRCam Observations

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Fine Guidance Sensor (FGS) is an infrared camera that will be used for fine pointing the James Webb Space Telescope (JWST). The source for selecting guide stars will be the Guide Star Catalog-II (GSC-II), which is the deepest and most complete all-sky survey used for space missions. Given that the FGS is an infrared camera and that the GSC-II is an optical survey, we developed a set of equations for transforming the GSC-II optical magnitudes to the FGS bandpass for Galactic latitudes above the plane. In order to test our transformations and to characterize the near-infrared (NIR) sky down to the magnitudes that the FGS will observe, we obtained J band observations above the Galactic plane with the Wide-Field Infrared Camera (WIRCam) instrument down to a magnitude of about 22 over an area of approximately one square degree.
PC is a Canadian representative to the JWST project supported by CSA and HIA under a PWGSC contract.

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