Pith Number

pith:2KGXUTJ3

pith:2025:2KGXUTJ3RMHCHCNALX37MMFIEV

not attested not anchored not stored refs pending

Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. II. Measuring Geometric Distances and Black Hole Masses of Four Nearby Quasars

Chen Hu, Daryl J. Santos, Dieter Lutz, Eckhard Sturm, Feng-Na Fang, Frank Eisenhauer, Hao Zhang, Hartmut Winkler, Helmut Feuchtgruber, Hua-Rui Bai, Jes\'us Aceituno, Jian-Min Wang, Jia-Qi Feng, Jin-Ming Bai, Jinyi Shangguan, Jun-Rong Liu, Linda J. Tacconi, Luis C. Ho, Michael S. Brotherton, Natascha M. F\"orster Schreiber, Pu Du, Reinhard Genzel, Ric Davies, Romain G. Petrov, Sebastian Rabien, Shuo Zhai, Stefan Gillessen, Taro Shimizu, Thomas Ott, Yan-Rong Li, Yi-Lin Wang, Yi-Peng Zhao, Yixian Cao, Yi-Xin Fu, Yong-Jie Chen, Yu-Yang Songsheng, Yu Zhao, Zhu-Heng Yao

arxiv:2502.18856 v2 · 2025-02-26 · 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{2KGXUTJ3RMHCHCNALX37MMFIEV}

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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	2026-07-05T11:28:34.604521Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d28d7a4d3b8b0e2389a05df7f630a8255281ca5582d9d478b6bcbce9151605a2

Aliases

arxiv: 2502.18856 · arxiv_version: 2502.18856v2 · doi: 10.48550/arxiv.2502.18856 · pith_short_12: 2KGXUTJ3RMHC · pith_short_16: 2KGXUTJ3RMHCHCNA · pith_short_8: 2KGXUTJ3

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/2KGXUTJ3RMHCHCNALX37MMFIEV \
  | 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: d28d7a4d3b8b0e2389a05df7f630a8255281ca5582d9d478b6bcbce9151605a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1b00314d89f7a710781e035b086b7d6ec0c65528fd31ae31510d23992c534e27",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2025-02-26T05:54:45Z",
    "title_canon_sha256": "32ba325cd36013f08014a6e9de09bc3661a04475d3fd1bc95fcae09d5b64e213"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2502.18856",
    "kind": "arxiv",
    "version": 2
  }
}