Pith Number

pith:RV674WKR

pith:2026:RV674WKRCDWW72VF2PEIX76UKU

not attested not anchored not stored refs resolved

Spin Demographics of Active Supermassive Black Holes: Updated Estimates from X-ray reflection and Future opportunities

Angelo Ricarte, Christopher S. Reynolds, Dominic J. Walton, James F. Steiner, James H. Matthews, Javier A. Garcia, Joanna M. Piotrowska, Julia M. Sisk-Reynes

Updated compilation of supermassive black hole spins from X-ray reflection shows no clear correlation with accretion rates.

arxiv:2605.13949 v1 · 2026-05-13 · 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{RV674WKRCDWW72VF2PEIX76UKU}

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.

Claims

C1strongest claim

No obvious apparent correlation between the Eddington-scaled accretion rate and the black hole spin is seen, noting that formal statistical tests are beyond the scope of this review.

C2weakest assumption

That the heterogeneous literature sample of spin measurements can meaningfully constrain SMBH growth models despite varying selection effects, analysis methods, and data quality across sources.

C3one line summary

An updated compilation of supermassive black hole spin measurements from X-ray reflection shows no clear link to accretion rate and highlights needs for uniform samples and next-generation observations.

References

136 extracted · 136 resolved · 2 Pith anchors

[1] The four laws of black hole mechanics.Commun 1973

[2] Floating Orbits, Superradiant Scattering and the Black-hole Bomb.Nature1972,238, 211–212

[3] Energy and angular momentum flow into a black hole.Commun 1972

[4] Disk-Accretion onto a Black Hole 1974

[5] Observational Constraints on Black Hole Spin.Annu 2021

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:13.762109Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8d7dfe595110ed6feaa5d3c88bffd4551c9cf35088424a943eba4ebe657b89ed

Aliases

arxiv: 2605.13949 · arxiv_version: 2605.13949v1 · doi: 10.48550/arxiv.2605.13949 · pith_short_12: RV674WKRCDWW · pith_short_16: RV674WKRCDWW72VF · pith_short_8: RV674WKR

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/RV674WKRCDWW72VF2PEIX76UKU \
  | 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: 8d7dfe595110ed6feaa5d3c88bffd4551c9cf35088424a943eba4ebe657b89ed

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cc06898b52b4ba525dd427eac19b1cf03bfd1ae47f8d7f5ffa86b1a8d3b14f12",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-05-13T18:00:00Z",
    "title_canon_sha256": "29d5f4dc42b1d865a86aedc1c5fb1302413f35a6aa0aeebcdae1fe4521fb29db"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13949",
    "kind": "arxiv",
    "version": 1
  }
}