Pith Number

pith:IMJ6X64T

pith:2026:IMJ6X64TT2UQP3XAPGYGKMVN5K

not attested not anchored not stored refs pending

The VLBI spectrum of the persistent radio source associated with FRB 20190417A

A. Rossi, B. Zhang, E. Maiorano, E. Palazzi, G. Bruni, L. Nicastro, L. Piro, S. Savaglio, Y.-P. Yang

VLBI observations detect a compact persistent radio source for FRB 20190417A and measure its nearly flat spectrum across frequencies.

arxiv:2604.03429 v2 · 2026-04-03 · astro-ph.HE · astro-ph.SR

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\usepackage{pith}
\pithnumber{IMJ6X64TT2UQP3XAPGYGKMVN5K}

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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 detect a compact source associated with FRB 20190417A at 5 GHz with a flux density of 150±45 uJy... derive a spectral index α = -0.19 ± 0.29... The inferred luminosity places the source on the proposed Lν-|RM| relation. Including this source yields a scatter of σΔ = 0.65, corresponding to α̂|ε| = 1.5 ± 0.7, consistent with forward shocks in the free-expansion phase or young pulsar wind nebulae.

C2weakest assumption

That the VLBI-detected compact source is identical to the VLA candidate PRS and that the non-detection at 8 GHz reflects the intrinsic spectrum rather than source variability or calibration issues.

C3one line summary

VLBI confirms a compact non-thermal persistent radio source for FRB 20190417A with nearly flat spectrum α=-0.19±0.29, placing it on the Lν-|RM| relation consistent with young nebulae or forward shocks.

Cited by

1 paper in Pith

Unveiling the Local Environment of FRB 20220912A: Sub-arcsecond $4-26$ GHz Radio Continuum Mapping

Receipt and verification

First computed	2026-06-10T01:10:00.295154Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4313ebfb939ea907eee079b06532adeab97341589638c878e57571256fd62368

Aliases

arxiv: 2604.03429 · arxiv_version: 2604.03429v2 · doi: 10.48550/arxiv.2604.03429 · pith_short_12: IMJ6X64TT2UQ · pith_short_16: IMJ6X64TT2UQP3XA · pith_short_8: IMJ6X64T

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IMJ6X64TT2UQP3XAPGYGKMVN5K \
  | 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: 4313ebfb939ea907eee079b06532adeab97341589638c878e57571256fd62368

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "595130e4d44dca38174773c39c492109653ca22aa2766ee54834bd61e4fe5f47",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-04-03T19:57:14Z",
    "title_canon_sha256": "acbe435125d0fb413a258ca12522704a55b3f5dfdb3dfca92730af929fe1b471"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.03429",
    "kind": "arxiv",
    "version": 2
  }
}