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Semantic Scholar Open Access 2024 5 sitasi

Euclid: High-precision imaging astrometry and photometry from Early Release Observations

M. Libralato L. Bedin M. Griggio D. Massari J. Anderson +495 lainnya
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Abstrak

The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid’s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.

Topik & Kata Kunci

Physics

Penulis (500)

M

M. Libralato

L

L. Bedin

M

M. Griggio

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D. Massari

J

J. Anderson

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E. P. F. Lausanne

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Observatoire de Sauverny

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Switzerland.

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Institut de Ci'encies del Cosmos

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U. Barcelona

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08193 Barcelona

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69622 Villeurbanne

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U. London

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Departament de F'isica

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F. Ciencias

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P. Lisboa

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U. Geneva

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08860 Castelldefels

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Format Sitasi

APA MLA BibTeX
Libralato, M., Bedin, L., Griggio, M., Massari, D., Anderson, J., Cuillandre, J. et al. (2024). Euclid: High-precision imaging astrometry and photometry from Early Release Observations. https://doi.org/10.1051/0004-6361/202452295

Akses Cepat

Lihat di Sumber doi.org/10.1051/0004-6361/202452295
Informasi Jurnal
Tahun Terbit
2024
Bahasa
en
Total Sitasi
5×
Sumber Database
Semantic Scholar
DOI
10.1051/0004-6361/202452295
Akses
Open Access ✓