Pith Number

pith:4FAF73LD

pith:2014:4FAF73LDQ4JZMAA4M2EFGAXX2B

not attested not anchored not stored refs pending

{\it NuSTAR} Reveals an Intrinsically X-ray Weak Broad Absorption Line Quasar in the Ultraluminous Infrared Galaxy Markarian 231

A.C. Fabian (Cambridge), A. Comastri (Osservatorio Astronomico di Bologna), A.F. Ptak (GSFC), B. Luo (Penn State), B.W. Grefenstette (Caltech), C.J. Hailey (Columbia), C. Saez (PUC), D. Farrah (VA Tech), D.J. Walton (Caltech), D.M. Alexander (Durham), D.R. Wik (GSFC), D. Stern (JPL), F.A. Harrison (Caltech), F.E. Bauer (PUC), F.E. Christensen (DTU Space), F. Fiore (Osservatorio Astronomico di Roma), G. Risaliti (Osservatorio Astrofisico di Arcetri), J.R. Rigby (GSFC), K.K. Madsen (Caltech), P. Gandhi (Durham), R.C. Hickox (Dartmouth), S.E. Boggs (Berkeley), Stacy H. Teng (GSFC), S. Veilleux (UMD), W.N. Brandt (Penn State), W.W. Craig (Lawrence Livermore), W.W. Zhang (GSFC)

arxiv:1402.4811 v1 · 2014-02-19 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4FAF73LDQ4JZMAA4M2EFGAXX2B}

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	2026-05-18T01:44:36.110017Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1405fed63871396001c66885302f7d0620720ffa03b305f335cfc9cc2b726c3

Aliases

arxiv: 1402.4811 · arxiv_version: 1402.4811v1 · doi: 10.48550/arxiv.1402.4811 · pith_short_12: 4FAF73LDQ4JZ · pith_short_16: 4FAF73LDQ4JZMAA4 · pith_short_8: 4FAF73LD

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/4FAF73LDQ4JZMAA4M2EFGAXX2B \
  | 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: e1405fed63871396001c66885302f7d0620720ffa03b305f335cfc9cc2b726c3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8d1b51b3ccbc1e7c59c814d005dddf6d3b63b62cb3876d57a504edad00e4a3d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2014-02-19T21:00:22Z",
    "title_canon_sha256": "30658d0a4cdf4bd3d6e75dc4c9ea68ca9256a50952db5eed2abb3f904664b577"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1402.4811",
    "kind": "arxiv",
    "version": 1
  }
}