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

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.

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Cited by in corpus (57)

• The LOFAR Two-metre Sky Survey Deep fields: The star formation rate - radio luminosity relation at low frequencies
• HELP: The Herschel Extragalactic Legacy Project
• Star formation and nuclear activity in luminous infrared galaxies: An infrared through radio review
• Knocking on giants' doors: I. The evolution of the dust-to-stellar mass ratio in distant dusty galaxies
• The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening
• Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
• The XMM-SERVS survey: XMM-Newton point-source catalogs for the W-CDF-S and ELAIS-S1 fields
• X-ray flux in the SED modelling: An application of X-CIGALE in the XMM-XXL field
• The relation between AGN type and host galaxy properties
• The coevolution of supermassive black holes and galaxies in luminous AGN over a wide range of redshift
• A Spitzer survey of Deep Drilling Fields to be targeted by the Vera C. Rubin Observatory Legacy Survey of Space and Time
• A new look at local ultraluminous infrared galaxies: the atlas and radiative transfer models of their complex physics
• The role of AGN and its obscuration on the position of the host galaxy relative to Main Sequence
• Radio and Far-IR Emission Associated with a Massive Star-forming Galaxy Candidate at z$\simeq$6.8: A Radio-Loud AGN in the Reionization Era?
• Star formation of X-ray AGN in COSMOS: The role of AGN activity and galaxy stellar mass
• Cosmic evolution of star-forming galaxies to $z\simeq 1.8$ in the faint low-frequency radio source population
• A Wide-area GMRT 610~MHz survey of ELAIS N1 field
• XXL-HSC: The link between AGN activity and star formation in the Early Universe ($z⩾3.5$)
• The bright end of the infrared luminosity functions and the abundance of hyperluminous infrared galaxies
• SFR estimations from z=0 to z=0.9 -- A comparison of SFR calibrators for star-forming galaxies
• S2COSMOS: Evolution of Gas Mass with Redshift Using Dust Emission
• The LOFAR Two-metre Sky Survey Deep fields: A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region
• In pursuit of giants: II. Evolution of dusty quiescent galaxies over the last six billion years from the hCOSMOS survey
• New constraints on the 1.4 GHz source number counts and luminosity functions in the Lockman Hole field
• Host Dark Matter Halos of WISE-selected Obscured & Unobscured Quasars: Evidence for Evolution
• Comparing the host galaxy ages of X-ray selected AGN in COSMOS: Obscured AGN are associated with older galaxies
• A hyperluminous obscured quasar at a redshift of z ~ 4.3
• Testing the evolutionary pathways of galaxies and their supermassive black holes and the impact of feedback from Active Galactic Nuclei via large multiwavelength datasets
• Ubiquitous radio emission in quasars: predominant AGN origin and a connection to jets, dust and winds
• A direct and robust method to observationally constrain the halo mass function via the submillimeter magnification bias: Proof of concept
• Cosmology with the submillimetre galaxies magnification bias: Proof of concept
• Radio AGN Selection and Characterization in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time
• The role of environment in galaxy evolution in the SERVS Survey I: density maps and cluster candidates
• A high redshift population of galaxies at the North Ecliptic Pole: unveiling the main sequence of dusty galaxies
• Getting ready for the LSST data -- estimating the physical properties of $z<2.5$ main sequence galaxies
• The slippery slope of dust attenuation curves: Correlation of dust attenuation laws with star-to-dust compactness up to z = 4
• Cross-correlation between $Planck$ CMB lensing potential and galaxy catalogues from HELP
• The Evolution of the Low-Frequency Radio AGN Population to $z\simeq 1.5$ in the ELAIS N1 Field
• Have we seen all the galaxies that comprise the cosmic infrared background at 250\,$\mu$m $\le \lambda \le$ 500\,$\mu$m?
• A study on the Clustering Properties of Radio-Selected sources in the Lockman Hole Region at 325 MHz
• GalaPy, the highly optimised C++/Python spectral modelling tool for galaxies -- I. Library presentation and photometric fitting
• The star-formation rates of QSOs
• Consistent analysis of the AGN LF in X-ray and MIR in the XMM-LSS field
• Probing the Mpc-scale environment of hyperluminous infrared galaxies at 2<z<4
• Constraints on galaxy formation from the cosmic-far-infrared-background\,$-$\,optical-imaging cross-correlation using \textit{Herschel} and UNIONS
• Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole
• SMART: spectral energy distributions Markov chain analysis with radiative transfer models
• The Lockman-SpReSO project. Description, target selection, observations and preliminary results
• DESHIMA 2.0: Rapid redshift surveys and multi-line spectroscopy of dusty galaxies
• MIGHTEE-\HI: Possible interactions with the galaxy NGC~895
• The incidence of X-ray AGN and non-AGN galaxies in the far-infrared: insights into host galaxy properties and AGN obscuration
• The Lockman--SpReSO project. Main properties of infrared selected star-forming galaxies
• Graph Theoretical Analysis of local ultraluminous infrared galaxies and quasars
• Reconstructing the mid-infrared spectra of galaxies using ultraviolet to submillimeter photometry and Deep Generative Networks
• A comparative study of galaxy evolution with four different active galactic nucleus torus models and two different host geometries
• Atomic hydrogen reservoirs in quiescent galaxies at z = 0.4
• Solving Inverse Problems for Spectral Energy Distributions with Deep Generative Networks