Published March 2020
| Version v1
Journal article
Probabilistic fibre-to-target assignment algorithm for multi-object spectroscopic surveys
Creators
- Tempel, E.
- Norberg, P.
- Tuvikene, T.
- Bensby, T.
- Chiappini, C.
- Christlieb, N.
- Cioni, M.-R
- Comparat, J.
- Davies, L
- Guiglion, G.
- Koch, A.
- Kordopatis, G.
- Krumpe, M.
- Loveday, J.
- Merloni, A.
- Micheva, G.
- Minchev, I.
- Roukema, Boudewijn
- Sorce, Jenny
- Starkenburg, E.
- Storm, J.
- Swann, E.
- Thi, W
- Traven, G.
- de Jong, R
Contributors
Others:
- Institute for Computational Cosmology (ICC) ; Durham University
- Tartu University Hospital
- Lund Observatory ; Lund University
- Leibniz-Institut für Astrophysik Potsdam (AIP)
- Zentrum für Astronomie der Universität Heidelberg (ZAH) ; Universität Heidelberg [Heidelberg] = Heidelberg University
- European Southern Observatory (ESO)
- Max-Planck-Institut für Extraterrestrische Physik (MPE)
- University of Oxford
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)
- Max Planck Institute for Extraterrestrial Physics (MPE) ; Max-Planck-Gesellschaft
- Centre de Recherche Astrophysique de Lyon (CRAL) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Kapteyn Astronomical Institute [Groningen] ; University of Groningen [Groningen]
- Institute of Cosmology and Gravitation [Portsmouth] (ICG) ; University of Portsmouth
- Institut für Physik und Astrophysik [Potsdam] ; University of Potsdam = Universität Potsdam
Description
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.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.science/hal-05025143
- URN
- urn:oai:HAL:hal-05025143v1
Origin repository
- Origin repository
- UNICA