Pith Number

pith:FDF7ZCGT

pith:2026:FDF7ZCGTN3H35HQBJO4WAFEQQF

not attested not anchored not stored refs resolved

Population synthesis of active galactic nuclei based on the radiation-regulated unification model

C. Ricci, D. Gerolymatou, S. Paltani, T. T. Ananna

Simulations of active galactic nuclei using a radiation-regulated model match the cosmic X-ray background with a 40 percent Compton-thick fraction.

arxiv:2605.17547 v1 · 2026-05-17 · astro-ph.HE · astro-ph.GA

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\usepackage{pith}
\pithnumber{FDF7ZCGTN3H35HQBJO4WAFEQQF}

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Record completeness

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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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

We derive an intrinsic Compton-thick fraction of 40±3%, and find that a simple evolutionary prescription controlling the active fraction of supermassive black holes is sufficient for our synthetic population to reproduce the CXB.

C2weakest assumption

The radiation-regulated unification model provides an accurate description of the circumnuclear geometry and emission spectra, so that RefleX ray-tracing simulations self-consistently reproduce observed X-ray absorption properties when the torus size, density, and evolutionary parameters are adjusted.

C3one line summary

Using ray-tracing simulations and simulation-based inference, the authors construct an AGN population that reproduces the cosmic X-ray background, number counts, and absorption properties, deriving an intrinsic Compton-thick fraction of 40±3%.

References

182 extracted · 182 resolved · 60 Pith anchors

[1] The Accretion History of AGN I: Supermassive Black Hole Population Synthesis Model · doi:10.3847/1538-4357/aafb77

[2] The close environments of accreting massive black holes are shaped by radiative feedback · doi:10.1038/nature23906

[3] RefleX: X-ray absorption and reflection in active galactic nuclei for arbitrary geometries 1906 · doi:10.1051/0004-6361/201629623

[4] Cosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background · doi:10.1086/378940

[5] Unified models for active galactic nuclei and quasars. , keywords =. doi:10.1146/annurev.aa.31.090193.002353 , adsurl = · doi:10.1146/annurev.aa.31.090193.002353

Receipt and verification

First computed	2026-05-20T00:04:45.169943Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

28cbfc88d36ecfbe9e014bb96014908176521ad5c097caac8f93191e500d742e

Aliases

arxiv: 2605.17547 · arxiv_version: 2605.17547v1 · doi: 10.48550/arxiv.2605.17547 · pith_short_12: FDF7ZCGTN3H3 · pith_short_16: FDF7ZCGTN3H35HQB · pith_short_8: FDF7ZCGT

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/FDF7ZCGTN3H35HQBJO4WAFEQQF \
  | 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: 28cbfc88d36ecfbe9e014bb96014908176521ad5c097caac8f93191e500d742e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3c8026e73dfe60781ea6c364ecd19d351db90406f76e550d4783aa6a183b38ab",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-05-17T17:01:24Z",
    "title_canon_sha256": "77fb86cc95eb8ef8737f848eb100a7312b53880f52abb8cdc6b494ebb005e76b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.17547",
    "kind": "arxiv",
    "version": 1
  }
}