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  • Tempel, E.University of Tartu (author)

Probabilistic fibre-to-target assignment algorithm for multi-object spectroscopic surveys

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2020-03-16
  • EDP Sciences,2020

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:8b8ec6f2-5707-409d-a87e-7989b37988eb
  • https://lup.lub.lu.se/record/8b8ec6f2-5707-409d-a87e-7989b37988ebURI
  • https://doi.org/10.1051/0004-6361/201937228DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context. Several new multi-object spectrographs are currently planned or under construction that are capable of observing thousands of Galactic and extragalactic objects simultaneously. Aims. In this paper we present a probabilistic fibre-to-target assignment algorithm that takes spectrograph targeting constraints into account and is capable of dealing with multiple concurrent surveys. We present this algorithm using the 4-m Multi-Object Spectroscopic Telescope (4MOST) as an example. Methods. The key idea of the proposed algorithm is to assign probabilities to fibre-target pairs. The assignment of probabilities takes the fibre positioner's capabilities and constraints into account. Additionally, these probabilities include requirements from surveys and take the required exposure time, number density variation, and angular clustering of targets across each survey into account. The main advantage of a probabilistic approach is that it allows for accurate and easy computation of the target selection function for the different surveys, which involves determining the probability of observing a target, given an input catalogue. Results. The probabilistic fibre-to-target assignment allows us to achieve maximally uniform completeness within a single field of view. The proposed algorithm maximises the fraction of successfully observed targets whilst minimising the selection bias as a function of exposure time. In the case of several concurrent surveys, the algorithm maximally satisfies the scientific requirements of each survey and no specific survey is penalised or prioritised. Conclusions. The algorithm presented is a proposed solution for the 4MOST project that allows for an unbiased targeting of many simultaneous surveys. With some modifications, the algorithm may also be applied to other multi-object spectroscopic surveys.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Norberg, P.Durham University (author)
  • Tuvikene, T.University of Tartu (author)
  • Bensby, T.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)astr-tbe (author)
  • Chiappini, C.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Christlieb, N.Heidelberg University (author)
  • Cioni, M. R.L.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Comparat, J.Max Planck Institute for Extraterrestrial Physics (author)
  • Davies, L. J.M.University of Western Australia, Crawley (author)
  • Guiglion, G.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Koch, A.Heidelberg University (author)
  • Kordopatis, G.Côte d'Azur Observatory (author)
  • Krumpe, M.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Loveday, J.University of Sussex (author)
  • Merloni, A.Max Planck Institute for Extraterrestrial Physics (author)
  • Micheva, G.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Minchev, I.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Roukema, B. F.Claude Bernard University Lyon 1,Nicolaus Copernicus University (author)
  • Sorce, J. G.Leibniz Institute for Astrophysics Potsdam (AIP),Claude Bernard University Lyon 1 (author)
  • Starkenburg, E.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Storm, J.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • Swann, E.University of Portsmouth (author)
  • Thi, W. F.Max Planck Institute for Extraterrestrial Physics (author)
  • Traven, G.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)gr0220tr (author)
  • De Jong, R. S.Leibniz Institute for Astrophysics Potsdam (AIP) (author)
  • University of TartuDurham University (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6350004-63611432-0746

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