An optimized tiling pattern for multiobject spectroscopic surveys: application to the 4MOST survey

Autor: Johan Comparat, Edward N. Taylor, Mirko Krumpe, E. Swann, Norbert Christlieb, C. J. Walcher, Radu S. Stoica, Georges Kordopatis, Sofia Feltzing, Andreas Koch, Peder Norberg, Cristina Chiappini, Jesper Storm, Boudewijn F. Roukema, T. Tuvikene, Jonathan Loveday, Maria-Rosa L. Cioni, Isobel Hook, Elmo Tempel, Jenny G. Sorce, R. S. de Jong, Thomas Bensby, Gregor Traven, Ivan Minchev, Moorits Mihkel Muru
Přispěvatelé: Institut Élie Cartan de Lorraine (IECL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
media_common.quotation_subject
FOS: Physical sciences
Probability density function
Field of view
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
law.invention
Telescope
010104 statistics & probability
surveys
law
Sky brightness
0103 physical sciences
Fraction (mathematics)
Marked point process
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
0101 mathematics
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Astrophysics::Galaxy Astrophysics
media_common
Physics
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Space and Planetary Science
Sky
techniques: miscellaneous
Astrophysics of Galaxies (astro-ph.GA)
methods: miscellaneous
Simulated annealing
Astrophysics - Instrumentation and Methods for Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Algorithm
Astrophysics - Cosmology and Nongalactic Astrophysics
Zdroj: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2020, 497 (4), pp.4626-4643. ⟨10.1093/mnras/staa2285⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 497 (4), pp.4626-4643. ⟨10.1093/mnras/staa2285⟩
Monthly notices of the Royal Astronomical Society, 2020, Vol.497(4), pp.4626-4643 [Peer Reviewed Journal]
ISSN: 0035-8711
1365-2966
Popis: Large multi-object spectroscopic surveys require automated algorithms to optimise their observing strategy. One of the most ambitious upcoming spectroscopic surveys is the 4MOST survey. The 4MOST survey facility is a fibre-fed spectroscopic instrument on the VISTA telescope with a large enough field of view to survey a large fraction of the southern sky within a few years. Several Galactic and extragalactic surveys will be carried out simultaneously, so the combined target density will strongly vary. In this paper, we describe a new tiling algorithm that can naturally deal with the large target density variations on the sky and which automatically handles the different exposure times of targets. The tiling pattern is modelled as a marked point process, which is characterised by a probability density that integrates the requirements imposed by the 4MOST survey. The optimal tilling pattern with respect to the defined model is estimated by the tiles configuration that maximises the proposed probability density. In order to achieve this maximisation a simulated annealing algorithm is implemented. The algorithm automatically finds an optimal tiling pattern and assigns a tentative sky brightness condition and exposure time for each tile, while minimising the total execution time that is needed to observe the list of targets in the combined input catalogue of all surveys. Hence, the algorithm maximises the long-term observing efficiency and provides an optimal tiling solution for the survey. While designed for the 4MOST survey, the algorithm is flexible and can with simple modifications be applied to any other multi-object spectroscopic survey.
Comment: 20 pages, 11 figures, submitted to MNRAS
Databáze: OpenAIRE
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