HELP: The Herschel Extragalactic Legacy Project

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dc.contributor.authorJarvis, M.J.
dc.contributor.authorShirley, R
dc.contributor.authorDuncan, K
dc.contributor.authorCampos Varillas, M.C.
dc.contributor.authorHurley, P.D.
dc.contributor.authorMalek, K
dc.contributor.authorRoehlly, Y
dc.contributor.authorOliver, S.J.
dc.date.accessioned2021-09-28T09:38:14Z
dc.date.available2021-09-28T09:38:14Z
dc.date.issued2021
dc.descriptionThe research leading to these results has received funding from the European Union Seventh Framework Programme FP7/2007-2013/under grant agreement No. 607254 (The Herschel Extragalactic Legacy Project). This publication reflects only the authors' view and the European Union is not responsible for any use that may be made of the information contained therein. SO acknowledges support from the Science and Technology Facilities Council (grant number ST/L000652/1) KM has been supported by the Polish National Science Centre (UMO-2018/30/E/ST9/00082).en_US
dc.description.abstractWe present the Herschel Extragalactic Legacy Project (HELP). This project collates, curates, homogenizes and creates derived data products for most of the premium multiwavelength 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 on the homogenization of calibration, metadata, 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 modeling the spectral energy distributions over the full HELP sky. All the software and data presented are publicly available. © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.en_US
dc.description.sponsorshipPolish National Science Centre: UMO-2018/30/E/ST9/00082; Science and Technology Facilities Council (STFC): ST/L000652/1; European Commission (EC): n/a; and, Seventh Framework Programme (FP7): 607254en_US
dc.identifier.citationShirley, R., Duncan, K., Campos Varillas, M. C., Hurley, P. D., Małek, K., Roehlly, Y., . . . Oliver, S. J. (2021). HELP: The herschel extragalactic legacy project. Monthly Notices of the Royal Astronomical Society, 507(1), 129-155. doi:10.1093/mnras/stab1526en_US
dc.identifier.issn00358711
dc.identifier.uri10.1093/mnras/stab1526
dc.identifier.urihttp://hdl.handle.net/10566/6831
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectAstronomical databasesen_US
dc.subjectCataloguesen_US
dc.subjectGalaxiesen_US
dc.subjectEvolutionen_US
dc.subjectInfrared: galaxiesen_US
dc.subjectGalaxies: evolutionen_US
dc.subjectSubmillimetre: galaxiesen_US
dc.subjectSurveysen_US
dc.subjectTechniques: photometricen_US
dc.subjectHerschel Extragalactic Legacy Project (HELP)en_US
dc.subjectHELPen_US
dc.subjectHerschel Multi-tiered Extragalactic Surveyen_US
dc.subjectHerMESen_US
dc.subjectHerschel Atlas surveyen_US
dc.subjectH-ATLASen_US
dc.subjectHomogenization of calibrationen_US
dc.subjectMetadataen_US
dc.titleHELP: The Herschel Extragalactic Legacy Projecten_US
dc.typeArticleen_US

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