CaltechAUTHORS
Published November 2022 | Version public
Journal Article Metadata-only

Candidate cosmic filament in the GJ526 field, mapped with the NIKA2 camera

Creators

  • 1. ROR icon Sorbonne University
  • 2. ROR icon Institut de Planétologie et d'Astrophysique de Grenoble
  • 3. ROR icon Aix-Marseille University
  • 4. ROR icon École Polytechnique
  • 5. ROR icon Cardiff University
  • 6. ROR icon Astrophysique, Instrumentation et Modélisation
  • 7. ROR icon Grenoble Institute of Technology
  • 8. ROR icon Institut Néel
  • 9. ROR icon International Research Institute for Radio Astronomy
  • 10. ROR icon Sapienza University of Rome
  • 11. ROR icon Centro de Astrobiología
  • 12. ROR icon Argonne National Laboratory
  • 13. ROR icon Instituto de Radioastronomía Milimétrica
  • 14. ROR icon Arizona State University
  • 15. ROR icon Laboratoire de Physique de l'ENS de Lyon
  • 16. ROR icon Osservatorio Astronomico di Cagliari
  • 17. ROR icon University of Pennsylvania
  • 18. ROR icon Institut d'Astrophysique de Paris
  • 19. ROR icon University of Lyon System
  • 20. ROR icon California Institute of Technology

Abstract

Distinctive large-scale structures have been identified in the spatial distribution of optical galaxies up to redshift z ∼ 1. In the more distant universe, the relationship between the dust-obscured population of star-forming galaxies observed at millimetre wavelengths and the network of cosmic filaments of dark matter apparent in all cosmological hydrodynamical simulations is still under study. Using the NIKA2 dual-band millimetre camera, we mapped a field of ∼90 arcmin² in the direction of the star GJ526 simultaneously in its 1.15-mm and 2.0-mm continuum wavebands to investigate the nature of the quasi-alignment of five sources found ten years earlier with the MAMBO camera at 1.2 mm. We find that these sources are not clumps of a circumstellar debris disc around this star as initially hypothesized. Rather, they must be dust-obscured star-forming galaxies, or sub-millimetre galaxies (SMGs), in the distant background. The new NIKA2 map at 1.15 mm reveals a total of seven SMGs distributed in projection on the sky along a filament-like structure crossing the whole observed field. Furthermore, we show that the NIKA2 and supplemental Herschel photometric data are compatible with a model of the spectral energy distributions (SEDs) of these sources when a common redshift of 2.5 and typical values of the dust parameters for SMGs are adopted. Hence, we speculate that these SMGs might be located in a filament of the distant 'cosmic web'. The length of this candidate cosmic filament crossing the whole map is at least 4 cMpc (comoving), and the separations between sources are between 0.25 cMpc and 1.25 cMpc at this redshift, in line with expectations from cosmological simulations. Nonetheless, further observations to determine the precise spectroscopic redshifts of these sources are required to definitively support this hypothesis of SMGs embedded in a cosmic filament of dark matter.

Additional Information

This work is based on observations carried out under project number 133-17 with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). We would like to thank the IRAM staff for their support during the campaigns. The NIKA2 dilution cryostat has been designed and built at the Institut Néel. In particular, we acknowledge the crucial contribution of the Cryogenics Group, and in particular Gregory Garde, Henri Rodenas, Jean Paul Leggeri, Philippe Camus. This work has been partially funded by the Foundation Nanoscience Grenoble and the LabEx FOCUS ANR-11-LABX-0013. This work is supported by the French National Research Agency under the contracts "MKIDS", "NIKA" and ANR-15-CE31-0017 and in the framework of the "Investissements d'avenir" program (ANR-15-IDEX-02). This work has benefited from the support of the European Research Council Advanced Grant ORISTARS under the European Union's Seventh Framework Program (Grant Agreement no. 291294). This research has made use of Herschel data; Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

Additional details

Identifiers

Eprint ID
118245
Resolver ID
CaltechAUTHORS:20221205-666301600.22

Funding

Institut national des sciences de l'Univers (INSU)
Centre National de la Recherche Scientifique (CNRS)
Max-Planck-Gesellschaft
Instituto Geográfico Nacional (IGN)
Foundation Nanoscience Grenoble
Agence Nationale pour la Recherche (ANR)
ANR-11-LABX-0013
Agence Nationale pour la Recherche (ANR)
ANR-15-CE31-0017
Agence Nationale pour la Recherche (ANR)
ANR-15-IDEX-02
European Research Council (ERC)
291294
NASA/JPL/Caltech

Dates

Created
2023-01-06
Created from EPrint's datestamp field
Updated
2023-01-06
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)