Dark Energy Spectroscopic Instrument (DESI)
Published May 22, 2025 | Version 1.0.0
Dataset Open

DESI Strong Lens Foundry III: Keck Spectroscopy for Strong Lenses Discovered Using Residual Neural Networks

Creators

  • 1. ROR icon University of Chicago
  • 2. ROR icon University of San Francisco
  • 3. ROR icon Lawrence Berkeley National Laboratory
  • 4. ROR icon National Optical Astronomy Observatory
  • 5. ROR icon Aix-Marseille Université
  • 6. ROR icon University of California, Berkeley
  • 7. ROR icon Boston University
  • 8. University of Rochester
  • 9. Imperial College London
  • 10. Newcastle University
  • 11. ROR icon University of Portsmouth
  • 12. ROR icon Fundación General
  • 13. USTHB: Faculty of Physics, University of Science and Technology Houari Boumediene (USTHB), Université des Sciences et de la Technologie Houari Boumediene
  • 14. ROR icon University of Edinburgh
  • 15. Sorbonne Université
  • 16. Universidad Nacional Autónoma de México Instituto de Física
  • 17. Institut de Física d'Altes Energies
  • 18. ROR icon Institució Catalana de Recerca i Estudis Avançats
  • 19. ROR icon Siena College
  • 20. ROR icon Universitat Politècnica de Catalunya
  • 21. ROR icon Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
  • 22. University of Michiga

Description

This dataset is supplementary material to the associated paper "DESI Strong Lens Foundry III: Keck Spectroscopy for Strong Lenses Discovered Using Residual Neural Networks" and can be used to generate paper figures 1-6. We refer readers to the README.md within the zip file provided for more information regarding the dataset contents.

Abstract:

We present spectroscopic data of strong lenses and their source galaxies using the Keck Near-Infrared Echellette Spectrometer (NIRES) and the Dark Energy Spectroscopic Instrument (DESI), providing redshifts necessary for nearly all strong-lensing applications with these systems, especially the extraction of physical parameters from lensing modeling. These strong lenses were found in the DESI Legacy Imaging Surveys using Residual Neural Networks (ResNet) and followed up by our HST program, with all systems displaying unambiguous lensed arcs. With NIRES, we target eight lensed sources at redshifts difficult to measure in the optical range and determine the source redshifts for six, between source redshifts 1.675 and 3.332. DESI observed one of the remaining source redshifts, as well as an additional source redshift within the six systems. The two systems with non-detections by NIRES were observed for a considerably shorter 600s at high airmass. Combining NIRES infrared spectroscopy with optical spectroscopy from our DESI Strong Lensing Secondary Target Program, these results provide the complete lens and source redshifts for six systems, a resource for refining automated strong lens searches in future deep- and wide-field imaging surveys and addressing a range of questions in astrophysics and cosmology.

Files

DESI-SLF-III-Data.zip

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