Cosmic Dawn is a new infrared survey covering the three Euclid deep fields and four other Euclid calibration fields using Spitzer's Infrared Array
Camera (IRAC). These new observations are combined 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 mission time. The resulting mosaics cover
a total of approximately 71.5 deg^2 in the 3.6 and 4.5 micron bands, and approximately 21.8 deg^2 in the 5.8 and 8 micron bands. They reach at least 24 AB
magnitude in the 3.6 micron 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.
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.
If you use Cosmic Dawn data, please cite the journal article Moneti et
al. (2021).
Jump to documentation.
|
Cosmic Dawn Survey Data Access
Cosmic Dawn Survey Cutouts