Pith Number

pith:F73DAGHW

pith:2009:F73DAGHWL7TAZXGI24C3OSIDT3

not attested not anchored not stored refs pending

What controls the Fe II strength in active galactic nuclei?

1), 2), (2) Carnegie Observatories, (3) Yunnan Observatory, (4) Steward Observatory, (5) National Astronomical Observatories, China, China), Hongyan Zhou (1), Huiyuan Wang (1), Jianguo Wang (3, Luis C. Ho (2), Tinggui Wang (1), Weimin Yuan (5) ((1) Univ. of Sci. & Tech. of China, Xiaobo Dong (1, Xiaohui Fan (4)

arxiv:0903.5020 v3 · 2009-03-29 · astro-ph.GA · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{F73DAGHWL7TAZXGI24C3OSIDT3}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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.

Receipt and verification

First computed	2026-05-18T04:17:04.683902Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2ff63018f65fe60cdcc8d705b749039ecb24186e77785e2948cc4eedd3694343

Aliases

arxiv: 0903.5020 · arxiv_version: 0903.5020v3 · doi: 10.48550/arxiv.0903.5020 · pith_short_12: F73DAGHWL7TA · pith_short_16: F73DAGHWL7TAZXGI · pith_short_8: F73DAGHW

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/F73DAGHWL7TAZXGI24C3OSIDT3 \
  | 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: 2ff63018f65fe60cdcc8d705b749039ecb24186e77785e2948cc4eedd3694343

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c11ef5391bbd6a6a6ef15175cbaea20d119d4b40a27b7910610f6998fcad3bf3",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-03-29T16:19:57Z",
    "title_canon_sha256": "ad6798d1b16ea05ec8afff28d5e12b892fe7ba16d5c7f3a1757109dd60cd2e4b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.5020",
    "kind": "arxiv",
    "version": 3
  }
}