Euclid preparation : XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields

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Euclid Collaboration , Moneti , A , McCracken , H J , Gozaliasl , G , Keihänen , E , Kirkpatrick , C C , Kurki-Suonio , H , Lindholm , V & Väliviita , J 2022 , ' Euclid preparation : XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields ' , Astronomy & Astrophysics , vol. 658 , A126 . https://doi.org/10.1051/0004-6361/202142361

Title: Euclid preparation : XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields
Author: Euclid Collaboration; Moneti, A.; McCracken, H. J.; Gozaliasl, G.; Keihänen, E.; Kirkpatrick , C. C.; Kurki-Suonio, H.; Lindholm, Valtteri; Väliviita, J.
Contributor organization: Department of Physics
Research Program in Systems Oncology
Helsinki Institute of Physics
Date: 2022-02-10
Language: eng
Number of pages: 15
Belongs to series: Astronomy & Astrophysics
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202142361
URI: http://hdl.handle.net/10138/342463
Abstract: 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 deg(2) in the 3.6 and 4.5 mu m bands, and approximately 21.8 deg(2) in the 5.8 and 8 mu m bands. They reach at least 24 AB magnitude (measured to 5 sigma, in a 2 ''.5 aperture) in the 3.6 mu m band and up to similar 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 less than or similar to 0 ''.15. The photometric calibration is in excellent agreement with previous WISE measurements. We extracted source number counts from the 3.6 mu m 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.
Subject: 115 Astronomy, Space science
cosmology: observations
large-scale structure of Universe
dark energy
dark matter
Galaxy: formation
surveys
LEGACY SURVEY
DATA RELEASE
GALAXIES
EVOLUTION
SAMPLE
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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