Pith Number

pith:YA25Z7QT

pith:2009:YA25Z7QTUFOGFKXG6XFQTQZ2ID

not attested not anchored not stored refs pending

Estimating Black Hole Masses in Active Galactic Nuclei Using the MgII 2800 Emission Line

2), (2) Univ. of Sci., (3) Carnegie Observatories), China, Hongyan Zhou (2) ((1) Yunnan Observatory, Huiyuan Wang (2), Jian-Guo Wang (1, Kai Zhang (2), Luis C. Ho (3), Shaohua Zhang (2), Tech. of China, Ting-Gui Wang (2), Weimin Yuan (1), Xiao-Bo Dong (2)

arxiv:0910.2848 v2 · 2009-10-15 · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YA25Z7QTUFOGFKXG6XFQTQZ2ID}

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	2026-05-18T02:34:18.720729Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c035dcfe13a15c62aae6f5cb09c33a40cc4efe60f640c014a93e856cd66e41c5

Aliases

arxiv: 0910.2848 · arxiv_version: 0910.2848v2 · doi: 10.48550/arxiv.0910.2848 · pith_short_12: YA25Z7QTUFOG · pith_short_16: YA25Z7QTUFOGFKXG · pith_short_8: YA25Z7QT

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/YA25Z7QTUFOGFKXG6XFQTQZ2ID \
  | 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: c035dcfe13a15c62aae6f5cb09c33a40cc4efe60f640c014a93e856cd66e41c5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8a934ccff34dfa623850faaadcf95517ad07ded012e718ab51a05ab726cb4a08",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-10-15T11:51:10Z",
    "title_canon_sha256": "facfda4ea26102c0b75f914fbfa3c0fb5f835ab05b0dd551517b6617a5989a84"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.2848",
    "kind": "arxiv",
    "version": 2
  }
}