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arxiv: 2605.22336 · v1 · pith:HFMNYDYQnew · submitted 2026-05-21 · 🌌 astro-ph.HE

Seyfert galaxy targets for KM3NeT neutrino telescope

A.Neronov , D.Savchenko , M.Poleshchuk This is my paper

Pith reviewed 2026-05-22 04:07 UTC · model grok-4.3

classification 🌌 astro-ph.HE
keywords Seyfert galaxiesneutrino telescopesKM3NeTIceCubeNGC 1068high-energy neutrinosactive galactic nuclei
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The pith

Four Seyfert galaxies are predicted detectable by KM3NeT if their neutrino luminosity scales with hard X-ray output.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper sets out to identify a short list of Seyfert galaxies that KM3NeT could detect as individual neutrino sources. It uses the scaling of neutrino luminosity with intrinsic hard X-ray luminosity to convert existing X-ray observations into expected neutrino fluxes for southern-sky targets. A sympathetic reader would care because this gives a concrete way to test the IceCube population detection with a second telescope whose sensitivity reaches different parts of the sky. The work focuses on four sources whose predicted signals stand out when spectra are taken from the NGC 1068 or NGC 4151 templates measured by IceCube.

Core claim

The authors construct a catalog of Seyfert galaxies whose neutrino fluxes are estimated by scaling their intrinsic hard X-ray luminosities and adopting the spectral shapes reported by IceCube for NGC 1068 and NGC 4151. Under this procedure NGC 1068, NGC 4151, NGC 4945 and the Circinus galaxy emerge as the only sources expected to produce detectable signals in KM3NeT. The resulting four-object list is proposed as a low-trial-factor target set for analyses that aim to confirm the Seyfert-galaxy neutrino population independently of IceCube.

What carries the argument

The scaling relation between neutrino luminosity and intrinsic hard X-ray luminosity of Seyfert galaxies, applied together with IceCube-derived spectral templates.

If this is right

  • KM3NeT observations of the four sources can provide an independent check of the IceCube Seyfert neutrino signal in the Southern Hemisphere.
  • The limited catalog reduces the number of trials in statistical searches for point sources.
  • Flux predictions for the three Compton-thick sources carry extra uncertainty because of possible absorption effects on the X-ray measurements.
  • The same scaling can be used to rank additional Seyfert galaxies for future deeper observations.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the scaling is verified, it supplies a practical way to forecast neutrino output for the much larger population of X-ray-selected Seyferts.
  • Detection or non-detection of the listed sources would help distinguish whether the neutrino emission is tied to the same coronal region that produces the hard X-rays.
  • The approach offers a template for target selection in other neutrino telescopes that may come online later.

Load-bearing premise

Neutrino luminosity of Seyfert galaxies scales directly with their intrinsic hard X-ray luminosity.

What would settle it

Absence of neutrino events from these four galaxies in several years of KM3NeT data would indicate that the scaling relation does not hold or that the spectra deviate strongly from the adopted templates.

Figures

Figures reproduced from arXiv: 2605.22336 by A.Neronov, D.Savchenko, M.Poleshchuk.

Figure 1
Figure 1. Figure 1: Expected neutrino flux from Seyfert galaxies in 0 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Left: cumulative source counts for NGC 1068 ( [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
read the original abstract

Neutrino signal from a population of Seyfert galaxies has been detected by IceCube neutrino telescope in the muon neutrino channel that has sensitivity mostly to the Northern Hemisphere sources. This detection can be verified by KM3NeT telescope that has sensitivity also in the Southern Hemisphere. We define a catalog of Seyfert galaxies that are expected to be detectable with KM3NeT, assuming that the neutrino luminosity scales with the intrinsic hard X-ray luminosity of the sources. We find that four sources: NGC 1068, NGC 4151, NGC 4945 and Circinus galaxy, are detectable by KM3NeT, if their spectra follow either NGC 1068 or NGC 4151 spectral template based on IceCube data. We discuss uncertainties of the neutrino flux estimate, considering the Compton-thick nature of three of the four detectable sources: NGC 1068, NGC 4945 and Circinus. The limited catalog of the four sources can be used in KM3NeT source search to reduce the trial factor of analysis aimed at independent verification of the neutrino signal from Seyfert galaxies.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript proposes a catalog of Seyfert galaxies expected to be detectable by KM3NeT, under the assumption that neutrino luminosity scales with intrinsic hard X-ray luminosity. Using IceCube-derived spectral templates for NGC 1068 and NGC 4151, it identifies four sources (NGC 1068, NGC 4151, NGC 4945, and Circinus galaxy) as detectable and discusses uncertainties for the three Compton-thick objects. The limited catalog is suggested to reduce trial factors in KM3NeT searches aimed at verifying the IceCube neutrino signal from Seyfert galaxies.

Significance. If the scaling relation holds, the work provides a focused target list that could enable efficient verification of the IceCube Seyfert neutrino signal with KM3NeT's southern-sky sensitivity, contributing to multi-messenger studies of AGN. The explicit discussion of Compton-thick uncertainties is a strength, but the overall significance depends on validating the extrapolation from only two IceCube sources.

major comments (2)
  1. [Abstract] Abstract: The detectability claim for NGC 4945 and Circinus rests on extrapolating the neutrino-to-hard-X-ray luminosity scaling from the two IceCube sources (NGC 1068, NGC 4151); no functional form, scatter, or independent correlation test is supplied to support this for the additional targets.
  2. [Uncertainties discussion] Uncertainties section: Systematic uncertainties in de-absorbed L_X for the Compton-thick sources are noted, but the manuscript does not propagate these (or plausible variations in the L_ν/L_X ratio by factors of 2–3) into quantitative KM3NeT event-rate predictions, leaving unclear whether the sources remain above the stated detection threshold.
minor comments (2)
  1. [Abstract] The abstract would benefit from briefly stating the initial sample size or explicit selection criteria used to narrow to the four sources.
  2. Consider adding a table summarizing the predicted fluxes or event rates for each of the four sources under both spectral templates to improve clarity.

Circularity Check

0 steps flagged

No significant circularity; derivation relies on explicit external assumption and IceCube data

full rationale

The paper explicitly frames the neutrino-to-X-ray luminosity scaling as an input assumption and applies IceCube-derived spectral templates for NGC 1068 and NGC 4151 to select four targets. No step reduces by construction to a fitted parameter renamed as prediction, nor does any load-bearing premise collapse to a self-citation chain. The catalog definition is a direct extrapolation from stated assumptions plus external observations, remaining self-contained against IceCube benchmarks. This matches the default expectation of no circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim depends on one domain assumption (neutrino-X-ray luminosity scaling) that is not derived within the paper and whose validity is not independently tested here.

axioms (1)
  • domain assumption Neutrino luminosity scales proportionally with intrinsic hard X-ray luminosity of Seyfert galaxies
    This relation is invoked to convert observed X-ray fluxes into predicted neutrino fluxes for KM3NeT detectability.

pith-pipeline@v0.9.0 · 5724 in / 1209 out tokens · 40230 ms · 2026-05-22T04:07:03.336585+00:00 · methodology

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Reference graph

Works this paper leans on

4 extracted references · 4 canonical work pages · 3 internal anchors

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    work page internal anchor Pith review Pith/arXiv arXiv doi:10.1051/0004-6361/201015644 2026

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    Application of Clumpy Torus Model to Broadband X- Ray Spectra of Two Seyfert 1 Galaxies: IC 4329A and NGC

    work page

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    Application of Clumpy Torus Model to Broadband X-ray Spectra of Two Seyfert 1 Galaxies: IC 4329A and NGC 7469

    Ap.J. 875, 115. doi:10.3847/1538-4357/ab0e08, arXiv:1903.11606. Oh, K., Koss, M., Markwardt, C.B., Schawinski, K., Baum- gartner, W.H., Barthelmy, S.D., Cenko, S.B., Gehrels, N., Mushotzky, R., Petulante, A., Ricci, C., Lien, A., Trakhten- brot, B., 2018. The 105-Month Swift-BAT All-sky Hard X- Ray Survey. Ap.J.Supp. 235, 4. doi:10.3847/1538-4365/ aaa7fd,...

    work page internal anchor Pith review Pith/arXiv arXiv doi:10.3847/1538-4357/ab0e08 1903

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    The Variable Hard X-Ray Emission of NGC 4945 as Observed by NuSTAR. Ap.J. 793, 26. doi:10.1088/ 0004-637X/793/1/26,arXiv:1407.3974. Tully, R.B., Rizzi, L., Shaya, E.J., Courtois, H.M., Makarov, D.I., Jacobs, B.A., 2009. The Extragalactic Distance Database. Astronomical Journal 138, 323–331. doi:10. 1088/0004-6256/138/2/323. Yaqoob, T., 2012. The nature of...

    work page internal anchor Pith review Pith/arXiv arXiv 2009