Stefanon, Mauro, Labbe, Ivo, Oesch, Pascal A, De Barros, Stephane, Gonzalez, Valentino, Bouwens, Rychard J, Franx, Marijn, Illingworth, Garth D, Holden, Brad, Magee, Dan, Smit, Renske and van Dokkum, Pieter (2021) The Spitzer/IRAC Legacy over the GOODS Fields: Full-depth 3.6, 4.5, 5.8, and 8.0 mu m Mosaics and Photometry for > 9000 Galaxies at z similar to 3.5-10 from the GOODS Reionization Era Wide-area Treasury from Spitzer (GREATS). Astrophysical Journal: Supplement Series, 257 (2). ISSN 0067-0049

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Abstract

We present the deepest Spitzer/InfraRed Array Camera (IRAC) 3.6, 4.5, 5.8, and 8.0 μm wide-area mosaics yet over the Great Observatories Origins Deep Survey (GOODS)-N and GOODS-S fields as part of the GOODS Reionization Era wide-Area Treasury from Spitzer (GREATS) project. We reduced and mosaicked in a self-consistent way observations taken by the 11 different Spitzer/IRAC programs over the two GOODS fields from 12 yr of Spitzer cryogenic and warm-mission data. The cumulative depth in the 3.6 μm and 4.5 μm bands amounts to ∼4260 hr, ∼1220 hr of which are new very deep observations from the GREATS program itself. In the deepest area, the full-depth mosaics reach ⪆200 hr over an area of ∼100 arcmin2, corresponding to a sensitivity of ∼29 AB magnitude at 3.6 μm (1σ for point sources). Archival cryogenic 5.8 μm and 8.0 μm band data (a cumulative 976 hr) are also included in the release. The mosaics are projected onto the tangential plane of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/GOODS at a 0.″3 pixel-1 scale. This paper describes the methodology enabling, and the characteristics of, the public release of the mosaic science images, the corresponding coverage maps in the four IRAC bands, and the empirical point-spread functions (PSFs). These PSFs enable mitigation of the source blending effects by taking into account the complex position-dependent variation in the IRAC images. The GREATS data products are in the Infrared Science Archive. We also release the deblended 3.6-8.0 μm photometry 9192 Lyman-break galaxies at z ∼ 3.5-10. GREATS will be the deepest mid-infrared imaging until the James Webb Space Telescope and, as such, constitutes a major resource for characterizing early galaxy assembly.

Item Type:	Article
Uncontrolled Keywords:	Science & Technology; Physical Sciences; Astronomy & Astrophysics; STELLAR MASS FUNCTIONS; STAR-FORMING GALAXIES; LOW-LUMINOSITY GALAXIES; HUBBLE FRONTIER FIELDS; ULTRA DEEP FIELD; PLUS O III; FORMATION RATES; MAIN-SEQUENCE; 1ST GALAXIES; BRIGHT END; Astronomy & Astrophysics; 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural)
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	IOP PUBLISHING LTD
SWORD Depositor:	A Symplectic
Date Deposited:	15 Nov 2022 12:12
Last Modified:	10 Dec 2022 00:50
DOI or ID number:	10.3847/1538-4365/ac2498
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18130

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