Pith Number

pith:XYLSJYDP

pith:2026:XYLSJYDPLVEGSOXR3YZDQOYS5Q

not attested not anchored not stored refs resolved

Global and Local Infall in the ASHES Sample (GLASHES). II. Asymmetric Line Profiles around Dense Cores in 70 $\mu$m Dark Massive Clumps

James M. Jackson, Kaho Morii, Patricio Sanhueza, Qizhou Zhang

Blue asymmetry in molecular line profiles indicates that gravitational infall is common in dense cores of massive 70 micron-dark clumps.

arxiv:2605.12595 v1 · 2026-05-12 · astro-ph.GA

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\usepackage{pith}
\pithnumber{XYLSJYDPLVEGSOXR3YZDQOYS5Q}

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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

Accounting for geometric effects that can obscure infall signatures, our results suggest that gravitational collapse is prevalent in and around the cores. Importantly, infall signatures are detected from the prestellar stage and become more dominant as cores' evolution proceeds.

C2weakest assumption

That blue asymmetry in the chosen optically thick tracers reliably traces infall after geometric projection effects are accounted for, rather than being produced by rotation, outflows, or optical-depth variations.

C3one line summary

Blue-asymmetric spectral lines appear in 50-60% of dense cores within massive dark clumps, showing that gravitational collapse operates at core scales from prestellar stages onward and supports hierarchical star formation.

References

297 extracted · 297 resolved · 109 Pith anchors

[1] A Search for Infall Motions Toward Nearby Young Stellar Objects · doi:10.1086/304812

[2] A Simple Model of Spectral-Line Profiles from Contracting Clouds. , keywords =. doi:10.1086/310146 , adsurl = · doi:10.1086/310146

[4] Evidence for Protostellar Collapse in B335. , keywords =. doi:10.1086/172271 , adsurl = · doi:10.1086/172271

[5] Self-reversed CO profiles in collapsing molecular clouds. , keywords =. doi:10.1086/154909 , adsurl = · doi:10.1086/154909

[6] Power-law distributions in empirical data · doi:10.1137/070710111

Receipt and verification

First computed	2026-05-18T03:10:01.200696Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be1724e06f5d48693af1de32383b12ec27dfaa446ad02da7b02dfb6cc60b159a

Aliases

arxiv: 2605.12595 · arxiv_version: 2605.12595v1 · doi: 10.48550/arxiv.2605.12595 · pith_short_12: XYLSJYDPLVEG · pith_short_16: XYLSJYDPLVEGSOXR · pith_short_8: XYLSJYDP

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/XYLSJYDPLVEGSOXR3YZDQOYS5Q \
  | 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: be1724e06f5d48693af1de32383b12ec27dfaa446ad02da7b02dfb6cc60b159a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "269b1d8e8ba1e5299b5abd06df0fd228fc7eac7e2809f3f5e7f364597d5fc88f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-12T18:00:01Z",
    "title_canon_sha256": "d43f9bedbfb6ad50f01a52f1c5780d41daf87f98d4b1828d34065db48cbd9124"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.12595",
    "kind": "arxiv",
    "version": 1
  }
}