Pith Number

pith:XQ4CRNGW

pith:2009:XQ4CRNGWV3QXVGQZD2FQUCJV3M

not attested not anchored not stored refs pending

Chemical Evolution of High-Redshift Radio Galaxies

(2) Rome Observatory, (3) Florence University), Alessandro Marconi (3), Kenta Matsuoka (1), Roberto Maiolino (2), Tohru Nagao (1), Yoshiaki Taniguchi (1) ((1) Ehime University

arxiv:0905.1581 v1 · 2009-05-11 · 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{XQ4CRNGWV3QXVGQZD2FQUCJV3M}

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.

Cited by

1 paper in Pith

Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs

Receipt and verification

First computed	2026-05-18T02:13:45.902607Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bc3828b4d6aee17a9a191e8b0a0935db249b99b6dbaa845fe1f9c54928e79c4f

Aliases

arxiv: 0905.1581 · arxiv_version: 0905.1581v1 · doi: 10.48550/arxiv.0905.1581 · pith_short_12: XQ4CRNGWV3QX · pith_short_16: XQ4CRNGWV3QXVGQZ · pith_short_8: XQ4CRNGW

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/XQ4CRNGWV3QXVGQZD2FQUCJV3M \
  | 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: bc3828b4d6aee17a9a191e8b0a0935db249b99b6dbaa845fe1f9c54928e79c4f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "70867919301b5ea7159b43ca1da5ec2625a129037af82955a4ffdd29de2f155a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-11T09:39:08Z",
    "title_canon_sha256": "5a29980833e9fa5a0c972bd129982b551578a7df2f562f3e42cb486f997c5bfc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.1581",
    "kind": "arxiv",
    "version": 1
  }
}