Pith Number

pith:A2NG6SDK

pith:2026:A2NG6SDK7G6OZNZKMYS726PZJK

not attested not anchored not stored refs resolved

Variability of Sagittarius A* at 3 GHz on minute-scale with MeerKAT

A. Basu, A. Brunthaler, C. K\"onig, D.J. Champion, E.D. Barr, G. Witzel, H.-R. Kl\"ockner, I. Rammala-Zitha, J.D. Wagenveld, K. Kaur, M. Hoeft, M. Kramer, M. Wielgus, O. Wucknitz, P.V. Padmanabh, R.S. Wharton, S.A. Mao, S. Buchner, S. Khan, S. Ranchod, S.S. Sridhar, V. Balakrishnan, V. Venkatraman Krishnan, Y.K. Ma

Sgr A* shows flux variations on tens-of-minute timescales at 2.79 GHz with 6.11% modulation.

arxiv:2604.22638 v1 · 2026-04-24 · astro-ph.GA · astro-ph.HE

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\usepackage{pith}
\pithnumber{A2NG6SDK7G6OZNZKMYS726PZJK}

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3 Author claim open · sign in to claim

4 Citations 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 detect flux variation on a few tens of minute timescale with a modulation index of 6.11 %, a mean flux density of (827 ± 0.1_stat ± 33_sys) mJy, and a mean spectral slope of 0.08±0.03. Furthermore, we measure the slope of the structure function of the observed light curve as 0.81 ± 0.05 with a characteristic timescale of about 120 min.

C2weakest assumption

The point-source model fitting in the uv-domain fully isolates intrinsic Sgr A* variability without significant contamination from interstellar scintillation, residual calibration errors, or nearby source confusion.

C3one line summary

Sgr A* shows 6.11% flux modulation on ~30-minute scales at 3 GHz with structure function slope 0.81 and ~120 min characteristic timescale.

References

2 extracted · 2 resolved · 0 Pith anchors

[1] 1997, in Astrophysics and Space Science Library, V ol 1997 · arXiv:1805.01242

[2] in CASA to perform a single-component model fitting to theuv- data, estimating the flux density of the source. A.4. Source Isolation and Primary Beam Correction Given the complexity of the GC environm 2021

Receipt and verification

First computed	2026-06-03T14:05:47.666151Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

069a6f486af9bcecb72a6625fd79f94aab14ca893bf6f5bae6df74e0db1aec84

Aliases

arxiv: 2604.22638 · arxiv_version: 2604.22638v1 · doi: 10.48550/arxiv.2604.22638 · pith_short_12: A2NG6SDK7G6O · pith_short_16: A2NG6SDK7G6OZNZK · pith_short_8: A2NG6SDK

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/A2NG6SDK7G6OZNZKMYS726PZJK \
  | 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: 069a6f486af9bcecb72a6625fd79f94aab14ca893bf6f5bae6df74e0db1aec84

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6602edb474f215da6be166486155f0c888aac6151f42baf3c55ebb06e0b54d20",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-24T15:13:57Z",
    "title_canon_sha256": "7d5b18c626b49948abe4efcf0a5bc8239eb90b1ade38a3c70b46b1481b317af7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.22638",
    "kind": "arxiv",
    "version": 1
  }
}