Computer Science – Performance
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21641507f&link_type=abstract
American Astronomical Society, AAS Meeting #216, #415.07; Bulletin of the American Astronomical Society, Vol. 41, p.825
Computer Science
Performance
Scientific paper
Recently, in November 2008 the WIYN High-resolution InfraRed Camera (WHIRC), mounted on the WIYN 3.5m telescope, was accepted as a general-use instrument supported by the Kitt Peak National Observatory and the WIYN collaboration. WHIRC provides near-IR coverage from 0.9-2.5 microns, resting on the WIYN Tip-Tilt Module (WTTM) port, boasting a strategic field of view (3.3'×3.3') covering most of the WTTM corrected field. Currently, the list of supported near-IR filters include three broad band filters: J, H, Ks, and 10 narrow bands: Low Airglow, He I, Pa β, Pa β ( 4500 km/s), [Fe II], [Fe II] ( 4500 km/s), H2 S(1), Br γ, Br γ ( 4500 km/s), CO. WHIRC has frequently demonstrated seeing-limited performance of approximately 0.5-0.6" FWHM, and as good as 0.3" during exceptional nights. With the full tip-tilt first-order corrections possible with WTTM, WHIRC should typically deliver images with approximately 0.3" FWHM and near-diffraction-limited images (0.20"). An easy to use operational interface has been implemented with the installation of the camera; yet, until now no consistent data reduction scheme has been universally available. We present the first ever stand-alone WHIRC data reduction pipeline written in the publicly available STScI Python (2.5). The pipeline as presented here carries out on-the-fly calibrations, sky-subtraction, flat-fielding, and filter-dependent distortion corrections. An additional alignment algorithm can be implemented for the mosaic combination of dithered images if the user chooses to do so. This pipeline corrects and replaces previous calibration software for the WHIRC instrument: namely the header and WCS correction device, "wprep.cl".
Beck Terry
Ferguson Brian A.
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