Pith Number

pith:UAL4R7TY

pith:2009:UAL4R7TYSQA5WX7TPCI7XNFKRR

not attested not anchored not stored refs pending

Using 21cm Absorption in Small Impact Parameter Galaxy-QSO Pairs to Probe Low-Redshift Damped and Sub-Damped Lyman-alpha System

David V. Bowen, Donald G. York, Emmanuel Momjian, Joseph D. Meiring, Min S. Yun, Sanchayeeta Borthakur, Todd M. Tripp

arxiv:0912.2575 v2 · 2009-12-14 · 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{UAL4R7TYSQA5WX7TPCI7XNFKRR}

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	2026-05-18T02:33:56.676376Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a017c8fe789401db5ff37891fbb4aa8c64941ca970112c7e652e0d26b3dcd7ce

Aliases

arxiv: 0912.2575 · arxiv_version: 0912.2575v2 · doi: 10.48550/arxiv.0912.2575 · pith_short_12: UAL4R7TYSQA5 · pith_short_16: UAL4R7TYSQA5WX7T · pith_short_8: UAL4R7TY

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/UAL4R7TYSQA5WX7TPCI7XNFKRR \
  | 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: a017c8fe789401db5ff37891fbb4aa8c64941ca970112c7e652e0d26b3dcd7ce

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bd0bfe9fc57862f237ff17cab481cf3679804e0e3ed458c913feb118bd9917b0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-12-14T05:19:54Z",
    "title_canon_sha256": "2fabd5e1aecc42fc86ab631894d0fcc6df6122fc8883263281fd645d9f1cd672"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.2575",
    "kind": "arxiv",
    "version": 2
  }
}