The Spitzer-HETDEX Exploratory Large Area Survey. IV. Model-Based Multi-wavelength Photometric Catalog

Abstract

We present a 0.3--4.5 $\hat{I}¼$m 16-band photometric catalog for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers a $\sim 27$ deg${}^2$ field within the footprint of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). Here we present new DECam imaging and a $riz{K}_s$-band-selected catalog of four million sources extracted using a fully model-based approach. We validate our photometry by comparing with the model-based DECam Legacy Survey. We analyze the differences between model-based and aperture photometry by comparing with the previous SHELA catalog, finding that our model-based photometry can measure point sources to fainter fluxes and better capture the full emission of resolved sources. The catalog is $80\%$ ($50\%$) complete at $riz\sim 24.7$ ($25.1$) AB mag, and the optical photometry reaches a $5\ddot{I}ƒ$ depth of $\sim 25.5$ AB mag. We measure photometric redshifts and achieve $1\ddot{I}ƒ$ scatter of $\hat{I}”z/(1+z)$ of 0.04 with available spectroscopic redshifts at $0\le z\le 1$. This large area, multi-wavelength photometric catalog, combined with spectroscopic information from HETDEX, will enable a wide range of extragalactic science investigations.

22 pages, 12 figures, submitted to ApJ