{
  "abstract": "We develop fCAMIRA (forced-mode CAMIRA), a tool for optical cluster confirmation, and apply it to a sample of 129 weak-lensing (WL) shear-selected galaxy clusters identified in aperture-mass maps obtained from the Hyper Suprime-Cam Subaru Strategic Program Three-Year (HSC-SSP Y3) weak-lensing data. fCAMIRA is built upon the CAMIRA cluster-finding algorithm and relies on a red-sequence (RS) galaxy model that is calibrated in a data-driven way. The RS model adopts the metallicity-luminosity relation measured in this work using X-ray-selected clusters up to redshift $z\\approx1.3$, followed by the calibration of color offsets using large spectroscopic samples. With the RS model, we build two types of galaxy richness maps, one obtained with a spatial filter matched to a typical cluster size of $R=0.8\\,h^{-1}\\,\\mathrm{Mpc}$ and the other obtained with a fixed angular-size filter identical to that used in constructing the WL aperture-mass maps. The fCAMIRA algorithm utilizes these two richness maps, identifies all optical counterpart candidates along the line of sight of each shear-selected cluster, and measures the cluster photometric redshift from the highest-ranked counterpart. The ranking is determined by the fractional lensing contribution $f_{\\mathrm{lens}}$ of each candidate. Using available spectroscopic cluster redshifts, we quantify the mean bias and scatter in the cluster photometric redshifts at levels of approximately 0.005 and 0.008, respectively, demonstrating excellent photometric-redshift performance. We compare the fCAMIRA photometric redshifts with estimates from direct positional cross-matching and find that approximately 8% of the total sample exhibits redshift discrepancies greater than 0.15. This outlier fraction is primarily attributed to projection effects, leading to the misidentification of the optical counterparts. (abridged)",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.02755",
  "author_total": 12,
  "authors": [
    {
      "name": "I-Non Chiu"
    },
    {
      "name": "Kai-Feng Chen"
    },
    {
      "name": "Masamune Oguri"
    },
    {
      "name": "Satoshi Miyazaki"
    },
    {
      "name": "Surhud More"
    },
    {
      "name": "Atsushi J. Nishizawa"
    },
    {
      "name": "Nobuhiro Okabe"
    },
    {
      "name": "Ken Osato"
    },
    {
      "name": "Naomi Ota"
    },
    {
      "name": "Tomomi Sunayama"
    },
    {
      "name": "Sut-Ieng Tam"
    },
    {
      "name": "Keiichi Umetsu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9yr6t0ffkb7a7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.02755",
  "fulltext_url": null,
  "id": "9yr6t0ffkb7a7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.02755",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.02755",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9yr6t0ffkb7a7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2608.02755",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.02755"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Weak-lensing Shear-Selected Galaxy Clusters from the Hyper Suprime-Cam Subaru Strategic Program: III. A precision cosmological sample enabled by optical confirmation",
  "title_text": "Weak-lensing Shear-Selected Galaxy Clusters from the Hyper Suprime-Cam Subaru Strategic Program: III. A precision cosmological sample enabled by optical confirmation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/9yr6t0ffkb7a7",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.33232/001c.171016",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}