Published December 1, 2023 | Version v1
Poster Open

ALMA Lensing Cluster Survey: Full SED Analysis of z=0.5-6 Lensed Galaxies Detected by Millimeter Observations

Authors/Creators

  • 1. ROR icon Kyoto University
  • 2. ROR icon The University of Tokyo
  • 3. ROR icon National Astronomical Observatory of Japan
  • 4. ROR icon Institute of Astronomy and Astrophysics, Academia Sinica
  • 5. ROR icon Ehime University
  • 6. ROR icon RIKEN
  • 7. Durham University
  • 8. ROR icon Nagoya University
  • 9. ROR icon The University of Texas at Austin
  • 10. Cosmic Dawn Center
  • 11. ROR icon University of Copenhagen
  • 12. University of Tokyo
  • 13. ROR icon Purple Mountain Observatory
  • 14. ROR icon Pontificia Universidad Católica de Chile
  • 15. ROR icon Millennium Institute of Astrophysics
  • 16. ROR icon Space Science Institute
  • 17. Københavns Universitet
  • 18. ROR icon University of Geneva
  • 19. University of Granada
  • 20. 自然科学研究機構国立天文台/National Astronomical Observatory of Japan
  • 21. ROR icon Max Planck Institute for Extraterrestrial Physics
  • 22. ROR icon Space Telescope Science Institute
  • 23. Technical University of Denmark
  • 24. Danmarks Tekniske Universitet
  • 25. Københavns Universitet Niels Bohr Instituttet
  • 26. ROR icon Chiba University
  • 27. ROR icon University of Arizona

Description

Sub/millimeter galaxies are a key population for the study of galaxy evolution because the majority of star formation at high redshifts occurred in galaxies deeply embedded in dust. To search for this population, we have performed an extensive survey with ALMA, called the ALMA Lensing Cluster Survey (ALCS). This survey covers 133 arcmin2 area and securely detects 180 sources at z~0.5–6 with a flux limit of ~0.2 mJy at 1.2 mm (Fujimoto et al. 2023). Here we report the results of multi-wavelength spectral energy distribution (SED) analysis of the whole ALCS sample, utilizing the observed-frame UV to millimeter photometry. We find that the majority of the ALCS sources lie on the star-forming main sequence, with a smaller fraction showing intense starburst activities. The ALCS sample contains high infrared-excess sources (IRX=log (Ldust/LUV)>1), including two extremely dust-obscured galaxies (IRX>5). We also confirm that the ALCS sample probes a broader range in lower dust mass than conventional SMG samples in the same redshift range. We identify six heavily obscured AGN candidates that are not detected in the archival Chandra data in addition to the three X-ray AGNs reported by (Uematsu et al. 2023). The inferred AGN luminosity density shows a possible excess at z=2–3 compared with that determined from X-ray surveys below 10 keV.

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ALMA2023_Poster_Uematsu.pdf

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