Euclid preparation: XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields
Entity
UAM. Departamento de Física TeóricaPublisher
EDP SciencesDate
2021-11-21Citation
10.1051/0004-6361/202142361
Astronomy and Astrophysics 658 (2022): A126
ISSN
0004-6361 (print); 1432-0746 (online)DOI
10.1051/0004-6361/202142361Editor's Version
https://doi.org/10.1051/0004-6361/202142361Subjects
Cosmology: observations; Dark energy; Dark matter; Galaxy: formation; Large-scale structure of Universe; Surveys; FísicaNote
Artículo escrito por un elevado núnmero de autores, sólo se referencian el qque aparece en primer lugar, los autores pertenecientes a la UAM y el nombre del grupo de colaboración, si lo hubiereRights
© Euclid Collaboration 2022Abstract
We present a new infrared survey covering the three Euclid deep fields and four other Euclid calibration fields using Spitzer Space Telescope's Infrared Array Camera (IRAC). We combined these new observations with all relevant IRAC archival data of these fields in order to produce the deepest possible mosaics of these regions. In total, these observations represent nearly 11 % of the total Spitzer Space Telescope mission time. The resulting mosaics cover a total of approximately 71.5 deg2 in the 3.6 and 4.5 μm bands, and approximately 21.8 deg2 in the 5.8 and 8 μm bands. They reach at least 24 AB magnitude (measured to 5σ, in a 2″.5 aperture) in the 3.6 μm band and up to ∼5 mag deeper in the deepest regions. The astrometry is tied to the Gaia astrometric reference system, and the typical astrometric uncertainty for sources with 16 "< "[3.6]< 19 is ≲ 0″.15. The photometric calibration is in excellent agreement with previous WISE measurements. We extracted source number counts from the 3.6 μm band mosaics, and they are in excellent agreement with previous measurements. Given that the Spitzer Space Telescope has now been decommissioned, these mosaics are likely to be the definitive reduction of these IRAC data. This survey therefore represents an essential first step in assembling multi-wavelength data on the Euclid deep fields, which are set to become some of the premier fields for extragalactic astronomy in the 2020s
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Google Scholar:Moneti, A.
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García-Bellido Capdevila, Juan
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Martinelli, Matteo
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Euclid Collaboration
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