Pith Number

pith:EX74RWKP

pith:2026:EX74RWKPAMM7EYYD3RYOWKG3B4

not attested not anchored not stored refs pending

Galactic Archaeology with the Subaru `\=Onohi`ula Prime Focus Spectrograph Strategic Program

Alexander S. Szalay, Ana L. Chies-Santos, Andrew P. Cooper, Carrie Filion, Chiaki Kobayashi, Dafa Wardana, Elisa G. M. Ferreira, Evan N. Kirby, Federico Sestito, Gang Zhao, Itsuki Ogami, Ivanna Escala, Jihye Hong, Jingkun Zhao, Judith G. Cohen, Keyi Ding, Kohei Hayashi, Kyosuke Sato, L\'aszl\'o Dobos, Lauren Henderson, Magda Arnaboldi, Masashi Chiba, Miho N. Ishigaki, Mohammad K. Mardini, Nicolas Martin, Nicole L. Klock-Miranda, Ortwin Gerhard, Pete B. Kuzma, Rin Miyazaki Sakurako Okamoto, Rohan Pattnaik, Roman Gerasimov, Rosemary F. G. Wyse, Ryo Ishikawa, Ryota Ikeda, Shunichi Horigome, Souradeep Bhattacharya, Takanobu Kirihara, Tam\'as Budav\'ari, Viska Wei, Wenbo Wu, Xiangwei Zhang, Xianhao Ye, Xiaosheng Zhao, Xinfeng Xu, Yohei Miki, Yoshihisa Suzuki, Yutaka Hirai, Yutaka Komiyama, Zhenyu Wu, Zhuohan Li

A Subaru PFS survey will model density profiles of six dwarf galaxies using 18,000 stars to test if they show cold dark matter cusps or alternative cores.

arxiv:2604.09875 v3 · 2026-04-10 · astro-ph.GA · astro-ph.SR

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\pithnumber{EX74RWKPAMM7EYYD3RYOWKG3B4}

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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

We will determine whether the mass density profiles of dwarf galaxies are consistent with cusps, as expected for cold dark matter, or cores, as expected from alternative dark matter theories or baryonic feedback.

C2weakest assumption

That the planned samples of 18,000 dwarf galaxy members and 30,000 M31 halo stars will be sufficient to reliably model full line-of-sight velocity and abundance distributions beyond tidal radii without significant contamination or selection biases.

C3one line summary

The PFS Galactic Archaeology survey will observe thousands of stars in Local Group systems to measure density profiles in dwarfs and compare assembly histories of M31 and the Milky Way.

Cited by

1 paper in Pith

The Merger-Driven Origin of the Vast Extended Stellar Disc Around the Andromeda Galaxy

Receipt and verification

First computed	2026-07-01T00:17:11.390600Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

25ffc8d94f0319f26303dc70eb28db0f0a0cad72788ae98cced7e254beb66f1e

Aliases

arxiv: 2604.09875 · arxiv_version: 2604.09875v3 · doi: 10.48550/arxiv.2604.09875 · pith_short_12: EX74RWKPAMM7 · pith_short_16: EX74RWKPAMM7EYYD · pith_short_8: EX74RWKP

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/EX74RWKPAMM7EYYD3RYOWKG3B4 \
  | 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: 25ffc8d94f0319f26303dc70eb28db0f0a0cad72788ae98cced7e254beb66f1e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "79c0ecdb19cce9f28eac654d31f6f05d30ddfe9a67b18687e5278dcc6f3cb9bc",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-10T20:04:44Z",
    "title_canon_sha256": "c2bb3ba8dd43095dce870e040e5cf1a7c2f09bb4d08532fba409234f663702b1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.09875",
    "kind": "arxiv",
    "version": 3
  }
}