Journal article
The GALAH survey: relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets
Monthly notices of the Royal Astronomical Society, Vol.459(1), pp.1069-1081
06/11/2016
DOI: 10.1093/mnras/stw746
Abstract
We present an analysis of the relative throughputs of the 3.9-m Anglo-Australian Telescope's 2dF/HERMES (High Efficiency and Resolution Multi-Element Spectrograph) system, based upon spectra acquired during the first two years of the Galactic Archaeology with HERMES survey. Averaged spectral fluxes of stars were compared to their photometry to determine the relative throughputs of fibres for a range of fibre position and atmospheric conditions. We find that overall the throughputs of the 771 usable fibres have been stable over the first two years of its operation. About 2.5 per cent of fibres have throughputs much lower than the average. There are also a number of yet unexplained variations between the HERMES bandpasses, and mechanically and optically linked fibre groups known as retractors or slitlets related to regions of the focal plane. These findings do not impact the science that HERMES will produce.
Details
- Title: Subtitle
- The GALAH survey: relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets
- Creators
- Jeffrey Simpson - Australian Astronomical ObservatoryG DeSilvaJ Bland-HawthornK Freeman - Australian National UniversityS Martell - UNSW SydneyKatharine Schlesinger - Australian National UniversitySanjib Sharma - University of SydneyD Zucker - Macquarie UniversityT Zwitter - University of LjubljanaJ KosBorja Anguiano - Macquarie UniversityDavid Nataf - Australian National UniversityWarren Reid - Macquarie UniversityRobert Wittenmyer - UNSW Sydney
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.459(1), pp.1069-1081
- Publisher
- Oxford University Press
- DOI
- 10.1093/mnras/stw746
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Language
- English
- Date published
- 06/11/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701832802771
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