Pith Number

pith:ZAXEKHC7

pith:2015:ZAXEKHC7Y4U2OLDXYJYH6F37LA

not attested not anchored not stored refs pending

Now You See It, Now You Don't: The Disappearing Central Engine of the Quasar J1011+5442

(2) Yale, 3), (3) Universidad de Concepcion, (4) U. Washington, (5) Carnegie Observatories, 6), (6) U. Illinois, (7) CfA, (8) Princeton, (9) MPE), Andrea Merloni (9), Antonis Georgakakis (9) ((1) Penn State, Donald P. Schneider (1), Eric Morganson (7), Jenny E. Greene (8), Jessie C. Runnoe (1), John J. Ruan (4), Michael Eracleous (1), Paul Green (7), Sabrina Cales (2, Scott F. Anderson (4), Stephanie LaMassa (2), Tom Dwelly (9), Yue Shen (5

arxiv:1509.03640 v1 · 2015-09-11 · astro-ph.GA · 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{ZAXEKHC7Y4U2OLDXYJYH6F37LA}

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	2026-05-18T01:33:14.964199Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c82e451c5fc729a72c77c2707f177f5804c9e0f970a82d8cadf16b057daf87bf

Aliases

arxiv: 1509.03640 · arxiv_version: 1509.03640v1 · doi: 10.48550/arxiv.1509.03640 · pith_short_12: ZAXEKHC7Y4U2 · pith_short_16: ZAXEKHC7Y4U2OLDX · pith_short_8: ZAXEKHC7

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/ZAXEKHC7Y4U2OLDXYJYH6F37LA \
  | 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: c82e451c5fc729a72c77c2707f177f5804c9e0f970a82d8cadf16b057daf87bf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ca8f7596bef5339fc1feee7ebc9c721575e251aa044a7ac08d9e86a14d316229",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-09-11T20:09:38Z",
    "title_canon_sha256": "f766f836edb4b7e478a81d97e3808deb9ace328ca4476a8cb9bedf9d875ca140"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.03640",
    "kind": "arxiv",
    "version": 1
  }
}