HELP: A catalogue of 170 million objects, selected at 0.36-4.5 $\mu$m, from 1270 deg.$^{2}$ of prime extragalactic fields

TL;DR

This paper introduces a comprehensive optical to near-infrared catalogue of 170 million objects across 1270 deg², combining data from 23 extragalactic survey fields for advanced astrophysical analyses.

Contribution

It systematically integrates data from multiple surveys into a standardized, high-resolution catalogue with derived quantities, enabling improved photometric redshift estimation and spectral modeling.

Findings

Catalogue covers 1270 deg² with 170 million objects.

Provides standardized fluxes, magnitudes, and astrometry corrections.

Includes depth and completeness statistics for various bands.

Abstract

We present an optical to near-infrared selected astronomical catalogue covering 1270 deg.$^2$. This is the first attempt to systematically combine data from 23 of the premier extragalactic survey fields - the product of a vast investment of telescope time. The fields are those imaged by the Herschel Space Observatory which form the Herschel Extragalactic Legacy Project (HELP). Our catalogue of 170 million objects is constructed by a positional cross match of 51 public surveys. This high resolution optical, near-infrared, and mid-infrared catalogue is designed for photometric redshift estimation, extraction of fluxes in lower resolution far-infrared maps, and spectral energy distribution modelling. It collates, standardises, and provides value added derived quantities including corrected aperture magnitudes and astrometry correction over the Herschel extragalactic wide fields for the first time. $grizy$ fluxes are available on all fields with $g$ band data reaching $5\sigma$ point-source depths in a 2 arcsec aperture of 23.5, 24.4, and 24.6 (AB) mag at the 25th, 50th, and 75th percentiles, by area covered, across all HELP fields. It has $K$ or $K_s$ coverage over 1146 deg.$^2$ with depth percentiles of 20.2, 20.4, and 21.0 mag respectively. The IRAC Ch 1 band is available over 273 deg.$^2$ with depth percentiles of 17.7, 21.4, and 22.2 mag respectively. This paper defines the "masterlist" objects for the first data release (DR1) of HELP. This large sample of standardised total and corrected aperture fluxes, uniform quality flags, and completeness measures provides large well understood statistical samples over the full Herschel extragalactic sky.