{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-09-16-018",
    "source_story_id": "tmp-sidebar-popiii-hetdex-candidates",
    "edition_id": "mp-2026-09-16-morning-0069",
    "edition_url": "https://themachinepress.com/edition/2026-09-16",
    "position": 20,
    "story_type": "ticker",
    "section": "research",
    "editorial_classification": "editorial",
    "headline": "Eight Galaxies Kept Helium but Hid Their Metals",
    "slug": "eight-galaxies-kept-helium-but-hid-their-metals",
    "dek": "A search of 109,545 emitters found eight tentative Population III-like candidates near redshift two.",
    "summary": "A search of 109,545 emitters found eight tentative Population III-like candidates near redshift two.",
    "body_text": "Researchers searched 109,545 high-confidence HETDEX Lyman-alpha emitters for strong narrow helium emission without detected ultraviolet metal lines. Eight candidates produced a stacked helium equivalent width of 28.7 ± 6.7 angstroms and no significant nitrogen, carbon or oxygen features at the reported limits. The combination is difficult to reproduce with several enriched-star, active-galaxy and shock alternatives. The authors call them very metal-poor or Population III-like candidates; deeper individual ultraviolet and optical spectra are required for confirmation.",
    "why_it_matters": "A search of 109,545 emitters found eight tentative Population III-like candidates near redshift two.",
    "limitations": [],
    "importance": 8,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-16-018/eight-galaxies-kept-helium-but-hid-their-metals",
    "json_url": "https://themachinepress.com/story/mp-2026-09-16-018.json",
    "first_published_at": "2026-09-16T09:00:00.000-04:00",
    "modified_at": "2026-09-16T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-09-16-018-001",
        "text": "A search of 109,545 emitters found eight tentative Population III-like candidates near redshift two.",
        "source_ids": [
          "source-2026-09-16-020"
        ],
        "qualification": null
      }
    ],
    "source_ids": [
      "source-2026-09-16-020"
    ],
    "tags": [
      "Population III",
      "HETDEX",
      "galaxy spectra"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-16-020",
      "title": "arXiv preprint 2609.16134",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.16134",
      "canonical_url": "https://arxiv.org/abs/2609.16134",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-14T20:00:00.000-04:00",
      "accessed_at": "2026-09-16T08:18:00.000-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-09-16-018-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "Eight Galaxies Kept Helium but Hid Their Metals",
    "publisher": "The Machine Press",
    "published_at": "2026-09-16T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-16-018/eight-galaxies-kept-helium-but-hid-their-metals"
  }
}