(LLNL), Livermore, CA (United States) Sponsoring Org.: USDOE National Nuclear Security Administration (NNSA) French National Research Agency (ANR) National Science Foundation (NSF) OSTI Identifier: 1836922 Report Number(s): LLNL-JRNL-829712 Journal ID: ISSN 0035-8711 1045544 Grant/Contract Number: AC52-07NA27344 ANR-13-PDOC-0006-01 AST-1102791 Resource Type: Journal Article: Accepted Manuscript Journal Name: Monthly Notices of the Royal Astronomical Society Additional Journal Information: Journal Volume: 445 Journal Issue: 1 Journal ID: ISSN 0035-8711 Publisher: Royal Astronomical Society Country of Publication: United States Language: English Subject: 79 ASTRONOMY AND ASTROPHYSICS instrumentation: adaptive optics instrumentation: high angular resolution methods: observational = ∼25.6 mag (AB) for compact sources. Publication Date: Mon Sep 29 00:00: Research Org.: Lawrence Livermore National Lab. Australian National Univ., Weston, ACT (Australia).Laboratoire d’Astrophysique de Marseille (LAM) Gemini Observatory, La Serena (Chile) Aix-Marseille Univ., Marseille (France).This systematic multi-epoch error is the dominant error term in the GeMS/GSAOI astrometric error budget, and it is thought to be due to time-variable distortion more » induced by gravity flexure. We show however that such performance is not reproducible for multi-epoch observations, and an additional systematic error of ~0.4 mas is evidenced. In this work, we find that for single-epoch, undithered data, an astrometric error below 0.2 mas can be achieved for exposure times exceeding 1 min, provided enough stars are available to remove high-order distortions. In particular, we analyse deep, mono-epoch images, multi-epoch data and distortion calibration. In this paper, we assess the astrometric performance and limitations of GeMS/GSAOI. Potential astrometric science cases cover a broad range of topics including exoplanets, star formation, stellar evolution, star clusters, nearby galaxies, black holes and neutron stars, and the Galactic Centre. Together with the Gemini South Adaptive Optics Imager (GSAOI), a near-infrared wide-field camera, GeMS/GSAOI's combination of high spatial resolution and a large field of view will make it a premier facility for precision astrometry. It delivers uniform, near-diffraction-limited image quality at near-infrared wavelengths over a 2 arcmin field of view. The Gemini multiconjugate adaptive optics system (GeMS) is a facility instrument for the Gemini South telescope.
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