The Spitzer-HETDEX Exploratory Large Area Survey. II. The Dark Energy Camera and Spitzer/IRAC Multiwavelength Catalog
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AbstractWe present the ugriz-band Dark Energy Camera (DECam) plus 3.6 and 4.5 m IRAC catalogs for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers 24 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 region, with seven bandpasses spanning a wavelength range of 0.35 to 4.5 m. SHELA falls within the footprint of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX), which will provide spectroscopic redshifts for 200,000 Ly emitters at 1.9<z<3.5 and also for 200,000 [O ii] emitters at z<0.5. SHELAs deep, wide-area multiwavelength images, combined with HETDEXs spectroscopic information, will facilitate many extragalactic studies, including measuring the evolution of galaxy stellar mass, halo mass, and environment from 1.5<z<3.5. Here we present riz-band-selected ugriz-band DECam catalogs that reach a 5 depth of 24.5 AB mag (for point sources with an aperture that encloses 70% of the total flux) and cover 17.5 deg2 of the overall SHELA field. We validate our DECam catalog by comparison to the DECam Legacy Survey (DECaLS) DR5 and the Dark Energy Survey (DES) DR1. We perform IRAC forced photometry with The Tractor image modeling code to measure 3.6 and 4.5 m fluxes for all objects within our DECam catalog. We demonstrate the utility of our catalog by computing galaxy number counts and estimating photometric redshifts. Our photometric redshifts recover the available ight angle =0.33$?> SDSS spectroscopic redshifts with a 1 scatter in z/(1 + z) of 0.04.
