Photometric Redshifts in the W-CDF-S and ELAIS-S1 Fields Based on Forced Photometry from 0.36 -- 4.5 Microns

TL;DR

This paper presents a large catalog of photometric redshifts for nearly 1.6 million sources in two LSST Deep Drilling fields, using forced photometry across multiple wavelengths to support future astronomical research.

Contribution

The study provides the first extensive photometric redshift catalog for the W-CDF-S and ELAIS-S1 fields based on forced photometry, enhancing data availability for upcoming LSST science.

Findings

Photometric redshifts are reliable when compared with spectroscopic data.

The catalog covers approximately 8.3 square degrees with high SNR detections.

Data is publicly accessible for the scientific community.

Abstract

The W-CDF-S and ELAIS-S1 fields will be two of the LSST Deep Drilling fields, but the availability of spectroscopic redshifts within these two fields is still limited on deg^2 scales. To prepare for future science, we use EAZY to estimate photometric redshifts (photo-zs) in these two fields based on forced-photometry catalogs. Our photo-z catalog consists of ~0.8 million sources covering 4.9 deg^2 in W-CDF-S and ~0.8 million sources covering 3.4 deg^2 in ELAIS-S1, among which there are ~0.6 (W-CDF-S) and ~0.4 (ELAIS-S1) million sources having signal-to-noise-ratio (SNR) > 5 detections in more than 5 bands. By comparing photo-zs and available spectroscopic redshifts, we demonstrate the general reliability of our photo-z measurements. Our photo-z catalog is publicly available at \doi{10.5281/zenodo.4603178}.