Pith Number

pith:XPMLXOVF

pith:2006:XPMLXOVFDVUJH5N7KXQMLQRS3N

not attested not anchored not stored refs pending

A Compact Supermassive Binary Black Hole System

2), (2) Universidad Simon Bolivar, 3), (3) National Radio Astronomy Observatory, (4) United States Naval Observatory, (5) Harvard-Smithsonian CfA, (6) University of California at Santa Cruz, (7) Stanford University), A. B. Peck (5), C. Rodriguez (1, G. B. Taylor (1, L. K. Pollack (6), R. T. Zavala (4), & R. W. Romani (7) ((1) University of New Mexico, SMA project

arxiv:astro-ph/0604042 v1 · 2006-04-03 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XPMLXOVFDVUJH5N7KXQMLQRS3N}

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

2 papers in Pith

Dual AGN and Multiple SMBH Systems in the Era of SKAO

Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211

Receipt and verification

First computed	2026-07-04T16:58:33.198804Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bbd8bbbaa51d6893f5bf55e0c5c232db57a7685b94a74bcb5b1b2323e6c74dbb

Aliases

arxiv: astro-ph/0604042 · arxiv_version: astro-ph/0604042v1 · doi: 10.48550/arxiv.astro-ph/0604042 · pith_short_12: XPMLXOVFDVUJ · pith_short_16: XPMLXOVFDVUJH5N7 · pith_short_8: XPMLXOVF

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/XPMLXOVFDVUJH5N7KXQMLQRS3N \
  | 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: bbd8bbbaa51d6893f5bf55e0c5c232db57a7685b94a74bcb5b1b2323e6c74dbb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2fab4d8797ae6efb52ef5fd4ee7e6e650fe1d3b599340d0b386156612e789ce2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2006-04-03T20:33:32Z",
    "title_canon_sha256": "608ba2974235409638eb72691f7f72f01eb1c0c97e6ab7c1691d1f6a63e48c81"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0604042",
    "kind": "arxiv",
    "version": 1
  }
}