Pith Number

pith:M4IVJ3YY

pith:2009:M4IVJ3YYJTZZZMRCC6UXJ7EOX5

not attested not anchored not stored refs pending

XMM-Newton Observations of a Complete Sample of Optically Selected Type 2 Seyfert Galaxies

Andrew A. Ptak (JHU), Ann Hornschemeier (NASA Goddard Space Flight Center), Christy Tremonti (MPIA), Lucimara Martins (NAT - Universidade Cruzeiro do Sul), Paule Sonnentrucker (JHU), Stephanie M. LaMassa, Timothy M. Heckman

arxiv:0909.3044 v1 · 2009-09-16 · 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{M4IVJ3YYJTZZZMRCC6UXJ7EOX5}

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	2026-05-18T02:34:29.853176Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

671154ef184cf39cb22217a974fc8ebf5c96e32cfc1a53a0c76483dcc17afb9c

Aliases

arxiv: 0909.3044 · arxiv_version: 0909.3044v1 · doi: 10.48550/arxiv.0909.3044 · pith_short_12: M4IVJ3YYJTZZ · pith_short_16: M4IVJ3YYJTZZZMRC · pith_short_8: M4IVJ3YY

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/M4IVJ3YYJTZZZMRCC6UXJ7EOX5 \
  | 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: 671154ef184cf39cb22217a974fc8ebf5c96e32cfc1a53a0c76483dcc17afb9c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9cb0938187a13f443497098151c37238f94e74fc84f61e2292804b4c1fd9eae7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-16T15:31:02Z",
    "title_canon_sha256": "1ac8652802bf5da1b64f1e20e78bdecacb2a25637b80398cbf2a885e7db04469"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.3044",
    "kind": "arxiv",
    "version": 1
  }
}