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

Jeffrey D. Simpson; G. M. De Silva; J. Bland-Hawthorn; K. C. Freeman; S. L. Martell; Katharine J. Schlesinger; Sanjib Sharma; D. B. Zucker; T. Zwitter; J. Kos; Borja Anguiano; David M. Nataf; Warren Reid; Robert A. Wittenmyer

doi:10.1093/mnras/stw746

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

Jeffrey D. Simpson^*, G. M. De Silva, J. Bland-Hawthorn, K. C. Freeman, S. L. Martell, Katharine J. Schlesinger, Sanjib Sharma, D. B. Zucker, T. Zwitter, J. Kos, Borja Anguiano, David M. Nataf, Warren Reid, Robert A. Wittenmyer

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1069-1081
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	459
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stw746
Publication status	Published - 11 Jun 2016

Keywords

Instrumentation: spectrographs
Techniques: spectroscopic

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Simpson, J. D., De Silva, G. M., Bland-Hawthorn, J., Freeman, K. C., Martell, S. L., Schlesinger, K. J., Sharma, S., Zucker, D. B., Zwitter, T., Kos, J., Anguiano, B., Nataf, D. M., Reid, W., & Wittenmyer, R. 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), 1069-1081. https://doi.org/10.1093/mnras/stw746

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title = "The GALAH survey: Relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets",

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.",

keywords = "Instrumentation: spectrographs, Techniques: spectroscopic",

author = "Simpson, {Jeffrey D.} and {De Silva}, {G. M.} and J. Bland-Hawthorn and Freeman, {K. C.} and Martell, {S. L.} and Schlesinger, {Katharine J.} and Sanjib Sharma and Zucker, {D. B.} and T. Zwitter and J. Kos and Borja Anguiano and Nataf, {David M.} and Warren Reid and Wittenmyer, {Robert A.}",

year = "2016",

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doi = "10.1093/mnras/stw746",

language = "English",

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Simpson, JD, De Silva, GM, Bland-Hawthorn, J, Freeman, KC, Martell, SL, Schlesinger, KJ, Sharma, S, Zucker, DB, Zwitter, T, Kos, J, Anguiano, B, Nataf, DM, Reid, W & Wittenmyer, RA 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, vol. 459, no. 1, pp. 1069-1081. https://doi.org/10.1093/mnras/stw746

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T2 - Relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets

AU - Simpson, Jeffrey D.

AU - De Silva, G. M.

AU - Bland-Hawthorn, J.

AU - Freeman, K. C.

AU - Martell, S. L.

AU - Schlesinger, Katharine J.

AU - Sharma, Sanjib

AU - Zucker, D. B.

AU - Zwitter, T.

AU - Kos, J.

AU - Anguiano, Borja

AU - Nataf, David M.

AU - Reid, Warren

AU - Wittenmyer, Robert A.

PY - 2016/6/11

Y1 - 2016/6/11

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AB - 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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KW - Techniques: spectroscopic

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

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Keywords

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