SPLASH-SXDF Multi-wavelength Photometric Catalog

TL;DR

This paper introduces a comprehensive multi-wavelength photometric catalog for the SXDF, combining optical and IR data to enable detailed galaxy studies across cosmic time.

Contribution

It presents a new, homogenized catalog with photometric redshifts and stellar masses for over 1.17 million objects, verified with spectroscopic data.

Findings

Photometric redshift accuracy with a median deviation of 0.023

Catalog includes data for approximately 1.17 million objects

High-quality multi-wavelength data suitable for galaxy evolution studies

Abstract

We present a multi-wavelength catalog in the Subaru-XMM Deep Field (SXDF) as part of the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH). We include the newly acquired optical data from the Hyper-Suprime Cam Subaru Strategic Program, accompanied by IRAC coverage from the SPLASH survey. All available optical and near-infrared data is homogenized and resampled on a common astrometric reference frame. Source detection is done using a multi-wavelength detection image including the $u$-band to recover the bluest objects. We measure multi-wavelength photometry and compute photometric redshifts as well as stellar masses for $\sim$1.17 million objects over $\sim$4.2 deg$^2$ with $\sim$800,000 objects in the 2.4 deg$^2$ HSC-UltraDeep coverage. Using the available spectroscopic redshifts from various surveys over the range of $0<z<6$, we verify the performance of the photometric redshifts and we find a normalized median absolute deviation of 0.023 and outlier fraction of 3.2%. The SPLASH-SXDF catalog is a valuable, publicly available resource that is perfectly suited for studying galaxies in the early universe and tracing their evolution through cosmic time. The catalog is available for download from https://z.umn.edu/SXDF .