The GALAH survey: relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets

Simpson, Jeffrey D. and de Silva, G. M. and Bland-Hawthorn, J. and Freeman, K. C. and Martell, S. L. and Schlesinger, Katharine J. and Sharma, Sanjib and Zucker, D. B. and Zwitter, T. and Kos, J. and Anguiano, Borja and Nataf, David M. and Reid, Warren and Wittenmyer, Robert A. (2016) The GALAH survey: relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets. Monthly Notices of the Royal Astronomical Society, 459 (1). pp. 1069-1081. ISSN 0035-8711

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 20 Mar 2017 01:04
Last Modified: 15 Feb 2019 01:31
Uncontrolled Keywords: spectroscopic techniques
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stw746

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