Pith Number

pith:TYSI2P3C

pith:2026:TYSI2P3CAYMQVSCGX2CRIRO4Y7

not attested not anchored not stored refs resolved

Eclipses of Nearby Radio-Loud Galactic Nuclei by Stars in Nuclear Star Clusters

Michal Zaja\v{c}ek (Masaryk University)

Large evolved stars in nuclear star clusters can eclipse the millimeter radio cores of nearby active galactic nuclei with about 10 percent depth.

arxiv:2605.15145 v1 · 2026-05-14 · astro-ph.GA · astro-ph.HE

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\pithnumber{TYSI2P3CAYMQVSCGX2CRIRO4Y7}

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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

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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

evolved stars with stellar radii of ≳500 R_⊙ can cause eclipses with the relative depth of ∼10%. Typical recurrence timescales are at least 10 years and the eclipse durations are ∼10 days.

C2weakest assumption

The presence of sufficiently large evolved stars (radii ≳500 R_⊙) in nuclear star clusters of radio-loud AGN that survive tidal disruption long enough to produce observable eclipses, combined with the radio core being compact enough at mm wavelengths to be fully or partially occulted.

C3one line summary

Evolved stars with radii ≳500 R_⊙ in nuclear star clusters can eclipse mm radio cores of nearby radio-loud AGN with ~10% relative depth, recurrence times ≳10 years, and durations ~10 days, enabling inference of SMBH masses and NSC composition.

References

18 extracted · 18 resolved · 3 Pith anchors

[1] N., & Wolf, R 1977 · doi:10.1086/155534

[2] F., Kramer M., 2008, @doi [ ] 10.1111/j.1365-2966.2008.14045.x , https://ui.adsabs.harvard.edu/abs/2008MNRAS.391.2009K 391 2009 · doi:10.1111/j.1365-2966.2008.14377.x

[3] First m87 event horizon telescope results. i. the shadow of the supermassive black hole 2019 · doi:10.3847/2041-8213/ab0ec7

[4] First Sagittarius A* Event Horizon Telescope Results 2022 · doi:10.3847/2041-8213/ac6674

[5] 2022, A&A, 658, A172, doi: 10.1051/0004-6361/202039778 2022 · doi:10.1051/0004-6361/202039778

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T21:40:25.528566Z
Last reissued	2026-05-17T21:57:18.848571Z
Builder	pith-number-builder-2026-05-17-v1
Signature	unsigned_v0
Schema	pith-number/v1.0

Canonical hash

9e248d3f6206190ac846be851445dcc7e1d2d8b8bc274a2f03e37fad1eb0c9b5

Aliases

arxiv: 2605.15145 · arxiv_version: 2605.15145v1 · pith_short_12: TYSI2P3CAYMQ · pith_short_16: TYSI2P3CAYMQVSCG · pith_short_8: TYSI2P3C

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/TYSI2P3CAYMQVSCGX2CRIRO4Y7 \
  | 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: 9e248d3f6206190ac846be851445dcc7e1d2d8b8bc274a2f03e37fad1eb0c9b5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "24d87bf92d3452fdc9b72eba241ebcb474409ba449b8b6a72c69c7b713001e1d",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-14T17:49:20Z",
    "title_canon_sha256": "95f9f7b10e8b035b06aa7f5ed1693b682f22be5113f242c40913607d2f982d20"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.15145",
    "kind": "arxiv",
    "version": 1
  }
}