Pith Number

pith:HFCJ4PTA

pith:2015:HFCJ4PTASIQVQEDHVSWGHCC7J7

not attested not anchored not stored refs pending

Towards an Understanding of Changing-Look Quasars: An Archival Spectroscopic Search in SDSS

Andrea Merloni, Antonis Georgakakis, Donald P. Schneider, Eric Morganson, Jenny E. Greene, Jessie C. Runnoe, John J. Ruan, Michael Eracleous, Michael R. Blanton, Paul J. Green, Sabrina L. Cales, Scott F. Anderson, Stephanie M. LaMassa, Tessa D. Wilkinson, Tom Dwelly, Yue Shen

arxiv:1509.03634 v2 · 2015-09-11 · astro-ph.HE · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HFCJ4PTASIQVQEDHVSWGHCC7J7}

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

1 paper in Pith

Exploring the Transitional Parameter Space of Blazars using Gamma-ray and X-ray Population Diagnostics

Receipt and verification

First computed	2026-05-18T01:08:43.387936Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39449e3e609221581067acac63885f4fe85fd74459917ba00c09c23f968b07ce

Aliases

arxiv: 1509.03634 · arxiv_version: 1509.03634v2 · doi: 10.48550/arxiv.1509.03634 · pith_short_12: HFCJ4PTASIQV · pith_short_16: HFCJ4PTASIQVQEDH · pith_short_8: HFCJ4PTA

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/HFCJ4PTASIQVQEDHVSWGHCC7J7 \
  | 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: 39449e3e609221581067acac63885f4fe85fd74459917ba00c09c23f968b07ce

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f4d3b2c013a62a963d0c92f9bd080ae972dd7ab2211930eb5169bbb6b241d3b7",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2015-09-11T20:03:27Z",
    "title_canon_sha256": "70c26cfa3160147cc85393bdc7336d7ad4d4d07b9d6af98d84d56c3b13fa4357"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.03634",
    "kind": "arxiv",
    "version": 2
  }
}