Pith Number

pith:C5OSRB2C

pith:2025:C5OSRB2CT3UNW36PBBVSFD7AJ2

not attested not anchored not stored refs resolved

Interpreting the strong clustering of ultra-diffuse galaxies by halo spin bias

Cheng Li, Houjun Mo, Qinglin Ma, Yangyao Chen

Ultra-diffuse galaxies cluster strongly because they occupy high-spin dark matter halos.

arxiv:2512.17742 v2 · 2025-12-19 · astro-ph.GA

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\usepackage{pith}
\pithnumber{C5OSRB2CT3UNW36PBBVSFD7AJ2}

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Record completeness

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4 Citations open

5 Replications open

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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

Using an empirical model implemented in SDSS-like mocks, we link the stellar surface-mass-density (Σ_*) of a galaxy to λ_a of its host halo and find an anti-correlation that more diffuse dwarfs tend to reside in higher-spin halos. The model naturally reproduces the observed strong clustering of UDGs within the standard ΛCDM framework without invoking exotic assumptions such as self-interacting dark matter.

C2weakest assumption

The empirical anti-correlation between stellar surface-mass-density Σ_* and halo spin λ_a (including unbound particles) is assumed to hold across the relevant mass range and environments; if this link is driven by the same selection effects that define the observed UDG sample, the reproduction of clustering becomes partly tautological.

C3one line summary

Strong clustering of ultra-diffuse galaxies is reproduced in ΛCDM by linking lower stellar surface density to higher host-halo spin measured with unbound particles.

References

1 extracted · 1 resolved · 0 Pith anchors

[1] V., 2016, ApJ, 824, 79 Aghanim N., et al., 2020, A&A, 641, A6 Amorisco N 2016 · doi:10.48550/arxiv.2209.07691

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T02:44:32.079572Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

175d2887429ee8db6fcf086b228fe04ea892c6023e1688fe6db960c675b0bab3

Aliases

arxiv: 2512.17742 · arxiv_version: 2512.17742v2 · doi: 10.48550/arxiv.2512.17742 · pith_short_12: C5OSRB2CT3UN · pith_short_16: C5OSRB2CT3UNW36P · pith_short_8: C5OSRB2C

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/C5OSRB2CT3UNW36PBBVSFD7AJ2 \
  | 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: 175d2887429ee8db6fcf086b228fe04ea892c6023e1688fe6db960c675b0bab3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27fd00a7035bd16a2f96e7d97f487cce09b327f8d2036e871ccad5d9a436c61e",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2025-12-19T16:19:31Z",
    "title_canon_sha256": "75f49aaf9e18bb3dbbab17169c16d735ea4f9e1efe6bcf93482281dd2d2dbefe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2512.17742",
    "kind": "arxiv",
    "version": 2
  }
}