SMOV: COS NUV External Spectroscopic Performance

Details SMOV: COS NUV External Spectroscopic Performance SMOV: COS NUV External Spectroscopic Performance

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cos..rept....8b&link_type=abstract

Instrument Science Report COS 2010-08, 20 pages

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

Scientific paper

We present the results from two COS SMOV programs (COS16 and COS17) designed to measure the spectral and spatial resolution of the COS NUV channel. The measured spectral resolution of data acquired through the PSA and BOA aperture match the requirements from the CEI specifications for COS. Observations from other SMOV programs were also utilized to increase the wavelength coverage and the number of isolated spectral lines available for analysis. The spectral resolution degradation as the target is displaced 0.25” from the center of the aperture was estimated to be around 29% and 21% for the G185M and G225M. Definitive measurements could not be made for the G285M and G230L gratings from the data. The plate scales were also determined for each grating in the dispersion and cross-dispersions. The spatial resolution for the PSA aperture was then obtained using the resulting plate scale and found to be: 0.075"± 0.004" (G185M), 0.058"± 0.002" (G225M), 0.056" ± 0.001" (G285M) and 0.081" ± 0.001" (G230L). The corresponding BOA spatial resolution is 0.29″, 0.22″, 0.24″ and 0.38″ for G185M, G225M, G285M and G230L, respectively. The aperture throughput along dispersion and perpendicular to dispersion was also determined as a function of the position of the target relative to the center of the PSA.

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