The GALAH Survey: Relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets
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Simpson, Jeffrey D.
De Silva, G. M.
Bland-Hawthorn, J.
Freeman, K. C.
Martell, S. L.
Schlesinger, Katharine J.
Sharma, Sanjib
Zucker, D. B.
Zwitter, T.
Kos, J.
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Oxford University Press
Abstract
We present an analysis of the relative throughputs of the 3.9-metre
Anglo-Australian Telescope's 2dF/HERMES system, based upon spectra acquired
during the first two years of the GALAH 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 & 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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Monthly Notices of the Royal Astronomical Society
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