HELP: The Herschel Extragalactic Legacy Project

Abstract

We present the Herschel Extragalactic Legacy Project (HELP). This project collates, curates, homogenises, and creates derived data products for most of the premium multi-wavelength extragalactic data sets. The sky boundaries for the first data release cover 1270 deg2 defined by the Herschel SPIRE extragalactic survey fields; notably the Herschel Multi-tiered Extragalactic Survey (HerMES) and the Herschel Atlas survey (H-ATLAS). Here, we describe the motivation and principal elements in the design of the project. Guiding principles are transparent or "open" methodologies with care for reproducibility and identification of provenance. A key element of the design focuses around the homogenisation of calibration, meta data and the provision of information required to define the selection of the data for statistical analysis. We apply probabilistic methods that extract information directly from the images at long wavelengths, exploiting the prior information available at shorter wavelengths and providing full posterior distributions rather than maximum likelihood estimates and associated uncertainties as in traditional catalogues. With this project definition paper we provide full access to the first data release of HELP; Data Release 1 (DR1), including a monolithic map of the largest SPIRE extragalactic field at 385 deg2 and 18 million measurements of PACS and SPIRE fluxes. We also provide tools to access and analyse the full HELP database. This new data set includes far-infrared photometry, photometric redshifts, and derived physical properties estimated from modelling the spectral energy distributions.

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• Radio and Far-IR Emission Associated with a Massive Star-forming Galaxy Candidate at z$\simeq$6.8: A Radio-Loud AGN in the Reionization Era?
• XXL-HSC: The link between AGN activity and star formation in the Early Universe ($z⩾3.5$)
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• MIGHTEE-HI: The relation between the HI gas in galaxies and the cosmic web
• The LOFAR Two-metre Sky Survey Deep fields: A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region
• Host Dark Matter Halos of WISE-selected Obscured & Unobscured Quasars: Evidence for Evolution
• WEAVE-StePS. A stellar population survey using WEAVE at WHT
• Testing the evolutionary pathways of galaxies and their supermassive black holes and the impact of feedback from Active Galactic Nuclei via large multiwavelength datasets
• X-ray luminosity-star formation rate scaling relation: Constraints from the eROSITA Final Equatorial Depth Survey (eFEDS)
• Radio AGN Selection and Characterization in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time
• Modelling high-resolution ALMA observations of strongly lensed dustystar forming galaxies detected by Herschel
• Multi-wavelength properties of 850-$\mu$m selected sources from the North Ecliptic Pole SCUBA-2 survey
• Panchromatic Photometry of Low-redshift, Massive Galaxies Selected from SDSS Stripe 82
• Dust grain size evolution in local galaxies: a comparison between observations and simulations
• LADUMA: Discovery of a luminous OH megamaser at $z>0.5$
• Low frequency radio continuum imaging and SED modeling of 11 LIRGs: radio-only and FUV to radio bands
• Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
• The Subtle Effects of Mergers on Star Formation in Nearby Galaxies
• Cross-correlation between $Planck$ CMB lensing potential and galaxy catalogues from HELP
• GalaPy, the highly optimised C++/Python spectral modelling tool for galaxies -- I. Library presentation and photometric fitting
• Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues I. Methodology and first application in the COSMOS field
• Decoding the IRX-β dust attenuation relation in star-forming galaxies at intermediate redshift
• Consistent analysis of the AGN LF in X-ray and MIR in the XMM-LSS field
• MIGHTEE-HI: Discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT
• The star-formation rates of QSOs
• SMART: spectral energy distributions Markov chain analysis with radiative transfer models
• Metallicity-PAH Relation of MIR-selected Star-forming Galaxies in AKARI North Ecliptic Pole-wide Survey
• A multi-band AGN-SFG classifier for extragalactic radio surveys using machine learning
• DESHIMA 2.0: Rapid redshift surveys and multi-line spectroscopy of dusty galaxies
• MIGHTEE-\HI: Possible interactions with the galaxy NGC~895
• Searching for low-redshift faint galaxies with MMT/Hectospec
• Graph Theoretical Analysis of local ultraluminous infrared galaxies and quasars
• The incidence of X-ray AGN and non-AGN galaxies in the far-infrared: insights into host galaxy properties and AGN obscuration
• Exploring the properties of the obscured hyperluminous quasar COS-87259 at z=6.853
• The XMM-SERVS X-ray eXtended Galaxy Cluster (XVXGC) catalog
• Tracing obscured galaxy build-up at high redshift using deep radio surveys
• A comparative study of galaxy evolution with four different active galactic nucleus torus models and two different host geometries
• Reconstructing the mid-infrared spectra of galaxies using ultraviolet to submillimeter photometry and Deep Generative Networks
• Deblending the MIGHTEE-COSMOS survey with XID+: The resolved radio source counts to $S_{1.4}\approx 5\mu$Jy
• Far-infrared lines hidden in archival deep multi-wavelength surveys: Limits on [CII]-158$\mu$m at $z\sim 0.3-2.9$
• Far-infrared observations of dust in Ly$\alpha$ emitters at z=2-6
• Deep ASKAP EMU Survey of the GAMA23 field: Properties of radio sources
• Constraining the AGN tori at cosmic noon using high-resolution JWST imaging and simultaneous SED fitting