Pith Number

pith:V6RP2ZQU

pith:2026:V6RP2ZQU5BON4UFDTDJWA32P5S

not attested not anchored not stored refs resolved

The Metallicity Distribution of the Ultra-Faint Dwarf Galaxy Segue 1

Alexander P. Ji, Alice M. Luna, Anirudh Chiti, Anna Frebel, Daisy Bissonette, Joshua D. Simon, Joss Bland-Hawthorn, Marla Geha, Ting S. Li

Segue 1's 40-star metallicity sample shows a single continuous star-formation episode before reionization.

arxiv:2605.12810 v1 · 2026-05-12 · astro-ph.GA

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\usepackage{pith}
\pithnumber{V6RP2ZQU5BON4UFDTDJWA32P5S}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The resulting MDF has an average [Fe/H] = -2.52 ± 0.10 dex and a dispersion of σ = 0.59 ± 0.06 dex, with no evidence for distinct subpopulations. This is consistent with a continuous, short-duration (≲ 1 Gyr) episode of star formation and chemical enrichment prior to reionization.

C2weakest assumption

The Ca II K absorption feature provides accurate [Fe/H] measurements without large systematic offsets for both red giant branch and main-sequence turnoff stars at these low metallicities, and the 40-star sample is representative of Segue 1's full stellar population without significant selection biases.

C3one line summary

Segue 1 has a metallicity distribution with mean [Fe/H] = -2.52 dex and dispersion 0.59 dex showing no subpopulations, consistent with continuous star formation lasting less than 1 Gyr before reionization.

References

68 extracted · 68 resolved · 1 Pith anchors

[1] A new look at the statistical model identification 1974 · doi:10.1109/tac.1974.1100705

[2] Beers, T. C., Rossi, S., Norris, J. E., Ryan, S. G., & Shefler, T. 1999, The Astronomical Journal, 117, 981, doi:10.1086/300727 1999 · doi:10.1086/300727

[3] B., Evans , N 2007 · doi:10.1086/509718

[4] 2011, Annual Review of Astronomy and Astrophysics, 49, 373, doi: 10.1146/annurev-astro-081710-102608 2011 · doi:10.1146/annurev-astro-081710-102608

[5] M., Tumlinson, J., Geha, M., et al.\ 2014, , 796, 91 2014 · doi:10.1088/0004-637x/796/2/91

Receipt and verification

First computed	2026-05-18T03:09:12.502116Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

afa2fd6614e85cde50a398d3606f4feca7fcc454fd8887a5f28cc1bb63e4c633

Aliases

arxiv: 2605.12810 · arxiv_version: 2605.12810v1 · doi: 10.48550/arxiv.2605.12810 · pith_short_12: V6RP2ZQU5BON · pith_short_16: V6RP2ZQU5BON4UFD · pith_short_8: V6RP2ZQU

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/V6RP2ZQU5BON4UFDTDJWA32P5S \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: afa2fd6614e85cde50a398d3606f4feca7fcc454fd8887a5f28cc1bb63e4c633

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4c75b9fb93c184810223e4de8f1ebe2ef53d1f658c0ff032c485f60bd0246750",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-12T23:11:00Z",
    "title_canon_sha256": "5fc54459c2d45b3fa81e9b6d0228c1d1b7d8fbb53fabd22ea17ace609b3cf7a4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.12810",
    "kind": "arxiv",
    "version": 1
  }
}