A dataset provided by the European Space Agency

DOI https://doi.org/10.57780/esa-baoae3v
Name Herschel Extragalatic Legacy Project Data Release 1 (HELP DR1)
Mission Herschel
Portal URL http://herschel.sussex.ac.uk/data_access/
Content URL Herschel Extragalactic Legacy Project Data Access
Version 1.0

Contents of HELP DR1

The first Herschel Extragalactic Legacy Project data release (HELP DR1) was made public in October 2021. The sky boundaries for the first data release (DR1) cover 1270 deg 2 defined by the 23 Herschel SPIRE extragalactic survey fields. The set of data released comprises:

  • Global catalogue containing all the optical to the infrared photometry, the redshifts and the physical parameters derived with SED fitting for around 172 million (1.72 10^8) sources.
  • XID+ catalogues that contains the forced photometry for sources that have been deblended from confusion dominated images with the infrared extraction pipeline XID+ for a total of 18 million (1.8 10^7) objects.
  • Blind catalogues of SPIRE objects across all 1270 deg2 of HELP fields containing 1.9 (1.9 10^6) million sources
  • CIGALE physical properties catalogues with 1.7 million (1.7 10^6) sources containing dust luminosity, star formation rate, stellar mass and the AGN contribution to dust luminosity. Also values of χ2s are provided: reduced , quantifying the global quality of the SED fit for each galaxy, and and . This catalogue was estimated for all galaxies with known redshift (spectroscopic or photometric), with at least two detections in the optical range, two detections in the near-infrared range and at least two far-infrared measurements (PACS and/or SPIRE) with SNR>2.
  • The homogenised Herschel SPIRE and PACS images.
  • Supplementary catalogues and extensive tools for accessing and analysing these new data sets.
Catalogues and images are organized by field. A few catalogues are available in the database to run across the entire HELP sky.
Code used for processing: https://github.com/H-E-L-P/dmu_products/
Raw data as fits tables and images: http://hedam.lam.fr/HELP/dataproducts/
Virtual observatory server: https://herschel-vos.phys.sussex.ac.uk/
  • Shirley et al. (2021), "HELP: the Herschel Extragalactic Legacy Project, Monthly Notices of the Royal Astronomical Society; https://doi.org/10.1093/mnras/stab1526"
  • Hurley et al. (2017)," HELP: XID+, the probabilistic de-blender for Herschel SPIRE maps https://doi.org/10.1093/mnras/stw2375"; Source Software: 2017ascl.soft04012H
  • Temporal Coverage From 3 December 2009 (00:20 UTC) to 6 January 2013 (17:16 UTC)
    Mission description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and ground-based facilities.
    Creator contact ESDC Helpdesk ticketing system: https://support.cosmos.esa.int/esdc/
    Contributors Herschel Extragalactic Legacy Project (HELP)
    Publisher and Registrant European Space Agency
    Acknowledgement The Herschel Extragalactic Legacy Project, (HELP), is a European Commission Research Executive Agency funded project under the SP1-Cooperation, Collaborative project, Small or medium-scale focused research project, FP7-SPACE-2013-1 scheme, Grant Agreement Number 607254.
    Citation Guidelines European Space Agency, 2021, HELP: the Herschel Extragalactic Legacy Project, HELP DR1, Version 1.0, European Space Agency, https://doi.org/10.57780/esa-baoae3v