SMOV: COS NUV Imaging Performance

Details SMOV: COS NUV Imaging Performance SMOV: COS NUV Imaging Performance

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cos..rept...10g&link_type=abstract

Instrument Science Report COS 2010-10(v1), 17 pages

Computer Science

Performance

Hubble Space Telescope, Hst, Space Telescope Science Institute, Cos, Cosmic Origins Spectrograph

Scientific paper

We describe the COS NUV imaging performance as derived from SMOV4 data. This includes photometric growth curves using data taken with the two available MIRROR settings (MIRRORA and MIRRORB) and the PSA and BOA apertures, throughput and image quality as function of spatial offset from the center of the COS aperture, and a description of the imaging-mode point spread function (PSF). The model PSF compares very well with the observed one, except for two minor ghosts located about 20 pixels away from the PSF center. A comparison of imaging observations of a cool and a hot flux standard star reveals a significantly higher red sensitivity of the COS imaging modes than that predicted from ground calibration data. New MIRROR throughput curves were therefore derived and delivered to SYNPHOT. These throughput curves are used in the COS imaging and imaging target acquisition exposure time calculators since October 7, 2009. Image drift during 5 HST orbits was determined from centroids of WCA exposures. The drift is dominated by movement in the X direction. The drift amplitude is significant: ~3.5 pixels with an e-folding time of ~50 min. With this in mind, observers taking images with exposure times longer than ~200 s are urged to use the TIME-TAG operating mode with the FLASH optional parameter.

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