Pith Number

pith:LHHW35EZ

pith:2009:LHHW35EZ2EDRNLODAXT2DWJCL7

not attested not anchored not stored refs pending

High-Redshift SDSS Quasars with Weak Emission Lines

2), (2) MPIA, 3) ((1) Arizona, (3) Penn State, 4), (4) North Texas, (5) Princeton, (6) Washington, (7) NRAO, (8) Drexel, 9), (9) Tufts), Aleksandar M. Diamond-Stanic (1), Christopher L. Carilli (7), Donald P. Schneider (3), Gary D. Schmidt (1), Gordon T. Richards (8), Jason E. Young (1, J. Serena Kim (1), Linhua Jiang (1), Marianne Vestergaard (1, Michael A. Strauss (5), Ohad Shemmer (3, Paul S. Smith (1), Robert R. Gibson (3), Scott F. Anderson (6), W. N. Brandt (3), Xiaohui Fan (1, Yue Shen (5)

arxiv:0904.2181 v2 · 2009-04-14 · astro-ph.GA · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LHHW35EZ2EDRNLODAXT2DWJCL7}

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

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	2026-05-18T02:34:59.760967Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

59cf6df499d10716adc305e7a1d9225fcb00d3484f0cfb58864aa8ed86a00103

Aliases

arxiv: 0904.2181 · arxiv_version: 0904.2181v2 · doi: 10.48550/arxiv.0904.2181 · pith_short_12: LHHW35EZ2EDR · pith_short_16: LHHW35EZ2EDRNLOD · pith_short_8: LHHW35EZ

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/LHHW35EZ2EDRNLODAXT2DWJCL7 \
  | 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: 59cf6df499d10716adc305e7a1d9225fcb00d3484f0cfb58864aa8ed86a00103

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f72567d056a04d583b9c0d9492d3618f3af3d7046e4e6c33f20a1e53826034b9",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-04-14T20:00:37Z",
    "title_canon_sha256": "39d9395275fc41799fd634426c170614283918cafe0d3dc84f8f112c09bd45eb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2181",
    "kind": "arxiv",
    "version": 2
  }
}