Holistic spectroscopy: complete reconstruction of a wide-field, multiobject spectroscopic image using a photonic comb
Article
Article Title | Holistic spectroscopy: complete reconstruction of a wide-field, multiobject spectroscopic image using a photonic comb |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Kos, Janez (Author), Bland-Hawthorn, Joss (Author), Betters, Christopher H. (Author), Leon-Saval, Sergio (Author), Asplund, Martin (Author), Buder, Sven (Author), Casey, Andrew R. (Author), D'Orazi, Valentina (Author), de Silva, Gayandhi (Author), Freeman, Ken (Author), Lewis, Geraint (Author), Lin, Jane (Author), Martell, Sarah L. (Author), Schlesinger, Katharine (Author), Sharma, Sanjib (Author), Simpson, Jeffrey D. (Author), Zucker, Daniel (Author), Zwitter, Tomaz (Author), Hayden, Michael (Author), Horner, Jonathan (Author), Nataf, David M. (Author) and Ting, Yuan-Sen (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 480 (4), pp. 5475-5494 |
Number of Pages | 20 |
Year | 2018 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty2175 |
Web Address (URL) | https://academic.oup.com/mnras/article/480/4/5475/5071958 |
Abstract | The primary goal of Galactic archaeology is to learn about the origin of the Milky Way from the detailed chemistry and kinematics of millions of stars. Wide-field multifibre spectrographs are increasingly used to obtain spectral information for huge samples of stars. Some surveys (e.g. GALAH) are attempting to measure up to 30 separate elements per star. Stellar abundance spectroscopy is a subtle art that requires a very high degree of spectral uniformity across each of the fibres. However, wide-field spectrographs are notoriously non-uniform due to the fast output optics necessary to image many fibre outputs on to the detector. We show that precise spectroscopy is possible with such instruments across all fibres by employing a photonic comb - a device that produces uniformly spaced spots of light on the CCD to precisely map complex aberrations. Aberrations are parametrized by a set of orthogonal moments with ̃100 independent parameters. We then reproduce the observed image by convolving high-resolution spectral templates with measured aberrations as opposed to extracting the spectra from the observed image. Such a forward modelling approach also trivializes some spectroscopic reduction problems like fibre cross-talk, and reliably extracts spectra with a resolution ̃2.3 times above the nominal resolution of the instrument. Our rigorous treatment of optical aberrations also encourages a less conservative spectrograph design in the future. |
Keywords | instrumentation; spectrographs; data analysis; image processing; spectroscopic; abundances; instrumentation and methods for astrophysics; astrophysics; solar and stellar astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Sydney |
Australian National University | |
Max Planck Society, Germany | |
Monash University | |
National Institute for Astrophysics, Italy | |
University of New South Wales | |
Australian Astronomical Observatory, Australia | |
Macquarie University | |
University of Ljubljana, Slovenia | |
School of Agricultural, Computational and Environmental Sciences | |
Johns Hopkins University, United States | |
Institute for Advanced Study, United States |
https://research.usq.edu.au/item/q518q/holistic-spectroscopy-complete-reconstruction-of-a-wide-field-multiobject-spectroscopic-image-using-a-photonic-comb
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