COS Near-UV Flat Fields and High S/N Determination from SMOV Data

Details COS Near-UV Flat Fields and High S/N Determination from SMOV Data COS Near-UV Flat Fields and High S/N Determination from SMOV Data

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cos..rept....3a&link_type=abstract

COS Instrument Science Report 2010-03(v1), 12 pages

Computer Science

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

Scientific paper

We describe the data taken with the internal flat-field lamp during the Servicing Mission Observatory Verification (SMOV) phase of COS to produce a high-quality near-UV (NUV) flat-field image. These data were compared to the flat-field image created during thermalvacuum (TV) testing to examine the latter's applicability for pipeline processing. The alignment between the on-orbit and ground flats is estimated to be better than one pixel, allowing the SMOV and TV data to be combined into a superflat reference file. This file also was updated to include a vignetting correction needed for external observations. We show that the use of flat fielding and FP-POS splitting can produce spectra with signal-tonoise greater than 100:1 in all NUV spectroscopic modes.

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