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2012MNRAS.425.1682E - Mon. Not. R. Astron. Soc., 425, 1682-1695 (2012/September-3)
Suppression of the near-infrared OH night-sky lines with fibre bragg gratings – first results.
ELLIS S.C., BLAND-HAWTHORN J., LAWRENCE J., HORTON A.J., TRINH C., LEON-SAVAL S.G., SHORTRIDGE K., BRYANT J., CASE S., COLLESS M., COUCH W., FREEMAN K., GERS L., GLAZEBROOK K., HAYNES R., LEE S., LOHMANNSROBEN H.-G., O'BYRNE J., MIZIARSKI S., ROTH M., SCHMIDT B., TINNEY C.G. and ZHENG J.
Abstract (from CDS):
The GNOSIS background is dominated by detector dark current below 1.67 µm and by thermal emission above 1.67 µm. After subtracting these, we detect an unidentified residual interline component of ≈ 860±210 photons/s/m2/arcsec2/µm, comparable to previous measurements. This component is equally bright in the suppressed and control spectra. We have investigated the possible source of the interline component, but were unable to discriminate between a possible instrumental artefact and intrinsic atmospheric emission. Resolving the source of this emission is crucial for the design of fully optimized OH suppression spectrographs. The next-generation OH suppression spectrograph will be focused on resolving the source of the interline component, taking advantage of better optimization for a fibre Bragg grating feed incorporating refinements of design based on our findings from GNOSIS. We quantify the necessary improvements for an optimal OH suppressing fibre spectrograph design.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s): atmospheric effects - instrumentation: miscellaneous - infrared: general
Simbad objects: 6
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