A1 Journal article (refereed)
Euclid preparation : XVII. Cosmic Dawn Survey : Spitzer Space Telescope observations of the Euclid deep fields and calibration fields (2022)
Euclid Collaboration. (2022). Euclid preparation : XVII. Cosmic Dawn Survey : Spitzer Space Telescope observations of the Euclid deep fields and calibration fields. Astronomy and Astrophysics, 658, Article A126. https://doi.org/10.1051/0004-6361/202142361
JYU authors or editors
Publication details
All authors or editors: Euclid Collaboration
Journal or series: Astronomy and Astrophysics
ISSN: 0004-6361
eISSN: 1432-0746
Publication year: 2022
Publication date: 10/02/2022
Volume: 658
Article number: A126
Publisher: EDP Sciences
Publication country: France
Publication language: English
DOI: https://doi.org/10.1051/0004-6361/202142361
Publication open access: Openly available
Publication channel open access: Partially open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/80586
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 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.
Keywords: cosmology; galaxies; galaxy clusters; dark matter; dark energy
Free keywords: cosmology: observations; large-scale structure of Universe; dark energy; dark matter; Galaxy: formation; surveys
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2022
JUFO rating: 2
