A Multi-Band Forced-Photometry Catalog in the ELAIS-S1 Field

TL;DR

This paper presents a comprehensive multi-band forced-photometry catalog for the ELAIS-S1 field, integrating data from multiple surveys to enhance source detection, deblending, and photometric redshift estimation.

Contribution

The study introduces a new forced-photometry catalog using The Tractor that combines high-resolution and low-resolution survey data for improved analysis.

Findings

Catalog contains over 0.8 million sources.

Enhanced photometric redshift accuracy.

Extended detection to fainter magnitudes.

Abstract

The ELAIS-S1 field will be an LSST Deep Drilling field, and it also has extensive multiwavelength coverage. To improve the utility of the existing data, we use The Tractor to perform forced-photometry measurements in this field. We compile data in 16 bands from the DeepDrill, VIDEO, DES, ESIS, and VOICE surveys. Using a priori information from the high-resolution fiducial images in VIDEO, we model the images in other bands and generate a forced-photometry catalog. This technique enables consistency throughout different surveys, deblends sources from low-resolution images, extends photometric measurements to a fainter magnitude regime, and improves photometric-redshift estimates. Our catalog contains over 0.8 million sources covering a 3.4 deg2 area in the VIDEO footprint and is available at 10.5281/zenodo.4540178.