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arxiv: 2605.01601 · v1 · submitted 2026-05-02 · 🌌 astro-ph.HE

Recognition: unknown

Zooming in on the GeV γ-ray flare of the blazar PKS 1725+123 with a multimessenger lens

Suvas Chandra Chaudhary , Saikat Das , Raj Prince , Brian van Soelen
Authors on Pith no claims yet

Pith reviewed 2026-05-09 17:51 UTC · model grok-4.3

classification 🌌 astro-ph.HE
keywords PKS 1725+123blazargamma-ray flareleptohadronic modelneutrino emissionIceCubemultimessenger astronomyinverse Compton
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The pith

The gamma-ray flare of blazar PKS 1725+123 arises mainly from inverse-Compton scattering of external photons in a one-zone leptohadronic model, with sub-dominant hadronic cascades and a predicted muon-neutrino rate of 0.3 per year.

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

The paper analyzes the multi-wavelength flare of the flat-spectrum radio quasar PKS 1725+123, including its spatial link to the IceCube neutrino event IC-201021A. It combines timing data showing variability on timescales under 6 hours with broadband spectra from radio to very-high-energy gamma rays. A one-zone leptohadronic model reproduces the observations by attributing high-energy gamma rays primarily to electrons scattering photons from the accretion disk and broad-line region. X-ray emission is explained by synchrotron self-Compton radiation from the same electrons, while hadronic processes contribute little to gamma rays but generate neutrinos at a modest rate.

Core claim

Our one-zone leptohadronic model shows that the high-energy gamma-ray flux is produced by a combination of inverse-Compton scattering of external photons from the hot accretion disk and the broad-line region, while the X-ray emission is dominated by synchrotron self-Compton radiation from relativistic electrons. The secondary radiation from the hadronic cascade is found to be sub-dominant in the gamma-ray regime, and the X-ray data constrain the maximum proton energy to approximately 20 PeV in the observer frame. Photopion production occurs predominantly with accretion-disk photons, resulting in an estimated muon-neutrino event rate of about 0.3 per year during the flaring state with theflux

What carries the argument

The one-zone leptohadronic emission model that self-consistently accounts for leptonic inverse-Compton and synchrotron self-Compton processes together with hadronic photopion production and cascades to fit the observed spectral energy distribution.

If this is right

  • High-energy gamma-ray emission during the flare is reproduced without dominant hadronic cascades.
  • X-ray data limit the maximum proton energy to roughly 20 PeV in the observer frame.
  • Photopion production with accretion-disk photons yields a muon-neutrino rate of approximately 0.3 events per year, peaking near 1 PeV.
  • Future TeV gamma-ray observations with CTA and LHAASO will tighten constraints on cosmic-ray acceleration efficiency.

Where Pith is reading between the lines

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

  • The modest neutrino rate implies that even confirmed blazar-neutrino associations may contribute only small numbers of events per source.
  • Rapid variability constraining the emission region to roughly 10^16 cm suggests particle acceleration occurs in a compact jet zone near the black hole.
  • Applying the same one-zone framework to other IceCube-associated blazars could test whether leptohadronic models consistently describe multimessenger flares.
  • Non-detection of the predicted 1 PeV neutrinos during future flares would require either lower proton densities or different target photon fields.

Load-bearing premise

The assumption that a single emission zone can fully describe the broadband spectrum and rapid variability without requiring multiple zones or extra components.

What would settle it

Observation of a muon-neutrino event rate from the source during a comparable flare that is substantially higher than 0.3 per year, or a clear hadronic spectral feature in gamma rays that exceeds the model's sub-dominant prediction.

Figures

Figures reproduced from arXiv: 2605.01601 by Brian van Soelen, Raj Prince, Saikat Das, Suvas Chandra Chaudhary.

Figure 1
Figure 1. Figure 1: The long-term Fermi-LAT 𝛾-ray light curve of PKS 1725+123, binned over 10 days, with Bayesian Blocks (black). Blue points show flux measurements with 𝑇𝑆 > 1. Horizontal lines indicate the mean flux (red) and three times the mean (green). The inset shows a zoomed view of the interval MJD 60745-61050. before converting into fluxes using the flux conversion factors of Lar￾ionov et al. (2016) and the zero poin… view at source ↗
Figure 2
Figure 2. Figure 2: Multiwavelength light curve of PKS 1725+123 during its high ac￾tivity state starting from March 2025. The shaded regions (MJD1: 60748- 60765, MJD: 60903-60936, MJD3: 60942-60955) show the three flaring events selected in this study. Here the one-day binned Fermi-LAT fluxes are reported in ph cm−2 s −1 , and X-ray to Radio fluxes expressed in erg cm−2 s −1 . The expression for 𝑡var is defined as (see., Burb… view at source ↗
Figure 3
Figure 3. Figure 3: SED of PKS 1725+123 during the three flaring epochs. The grey data points indicate archival data. The yellow, green, blue, and red data points correspond to the radio, NIR-UV, X-ray, and 𝛾-ray wavebands, respectively. The black solid line shows the total emission. The black dotted and solid data correspond to the estimated 1-flavor 𝜈𝜇 + 𝜈𝜇 flux upper limits from TXS 0506+056 for 1 detection in 0.5 and 7.5 … view at source ↗
Figure 5
Figure 5. Figure 5: Time averaged Swift-XRT spectra of PKS 1712+123: The spectra is well fitted by a simple powerlaw model, with, Γ = (1.749±0.084), column density, 𝑁𝐻 = (9.01±2.02) ×1020𝑐𝑚−2 , 𝜒 2 𝑟𝑒𝑑 = 37.71/44, and unabsorbed flux = (3.998 ± 0.148)×10−12 erg cm−2 s −1 . 4 DISCUSSIONS AND CONCLUSIONS AGNs, specifically blazars, are the most numerous detected extra￾galactic 𝛾-ray emitters. Their cosmological number density a… view at source ↗
Figure 4
Figure 4. Figure 4: Variation of the observed flux as a function of spectral index. The upper panel shows results from Fermi-LAT, while the lower panel presents corresponding measurements from Swift-XRT, enabling a direct comparison of flux–spectral variations across the 𝛾-ray and X-ray bands. vidual epochs shows negligible variation. The single flavor 𝜈𝜇 + 𝜈𝜇 flux peaks at an energy ≈ 1 PeV and is shown in view at source ↗
read the original abstract

Blazars are promising sources of extragalactic high-energy astrophysical neutrinos, detected at energies $\gtrsim 10$ TeV by the IceCube neutrino observatory. Here, we report the first-ever broadband timing and spectral study of the flat-spectrum radio quasar PKS 1725+123, which has recently emerged as a compelling multimessenger target following its spatial association with the IceCube event IC-201021A. This triggered extensive follow-up observations from radio to VHE $\gamma$-rays, and a multi-episode flare was identified at a later time. During this period, the source exhibited high flux variability across all wavelengths. The {\it Fermi}-LAT analysis suggests rapid variability on timescales of less than 6 hours, implying a compact emission region with a radius of $\sim10^{16}$ cm. Our one-zone leptohadronic model shows that the high-energy $\gamma$-ray flux is produced by a combination of inverse-Compton scattering of external photons from the hot accretion disk and the broad-line region, while the X-ray emission is dominated by synchrotron self-Compton radiation from relativistic electrons. The secondary radiation from the hadronic cascade is found to be sub-dominant in the $\gamma$-ray regime, and the X-ray data constrain the maximum proton energy to $\sim 20$ PeV in the observer frame. Photopion production occurs predominantly with accretion-disk photons, resulting in an estimated muon-neutrino event rate of $\approx 0.3~\mathrm{yr}^{-1}$ during the flaring state with the flux peaking at $\sim1$ PeV. Future observations of TeV $\gamma$-rays by CTA and LHAASO will further constrain cosmic-ray production in this source.

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

3 major / 2 minor

Summary. The manuscript presents the first broadband timing and spectral analysis of the FSRQ PKS 1725+123 during a multi-episode GeV flare, including its spatial association with IceCube event IC-201021A. Fermi-LAT data indicate variability on timescales <6 hours, implying an emission region radius of ~10^16 cm. A one-zone leptohadronic model is used to interpret the SED, attributing high-energy gamma-rays primarily to external Compton scattering on hot accretion disk and broad-line region photons, X-rays to synchrotron self-Compton from electrons, with hadronic cascade radiation sub-dominant; X-ray data constrain the maximum proton energy to ~20 PeV, and photopion production (dominated by disk photons) yields an estimated muon-neutrino event rate of ~0.3 yr^{-1} peaking at ~1 PeV during the flare.

Significance. If the modeling assumptions hold, the work provides a quantitative multimessenger link for a specific blazar, demonstrating how X-ray constraints can limit hadronic contributions and how external photon fields drive neutrino production. The variability-derived size and the predicted neutrino flux (testable by IceCube and future TeV instruments like CTA/LHAASO) represent concrete, falsifiable outputs that advance understanding of blazar neutrino emission mechanisms.

major comments (3)
  1. The muon-neutrino event rate of ≈0.3 yr^{-1} is obtained by fitting the same one-zone leptohadronic model (with free parameters including maximum proton energy and emission region radius) to the observed X-ray and gamma-ray fluxes; this renders the rate a post-hoc model output rather than an independent prediction, weakening the multimessenger claim (abstract and modeling description).
  2. The central one-zone assumption of a uniform region with radius ~10^{16} cm reproducing the full SED relies on external photon densities from the disk and BLR; given the <6-hour variability, this compactness may imply higher photon densities or stratification that would increase the photopion optical depth and alter both the sub-dominance of hadronic gamma-rays and the neutrino rate (abstract and variability analysis).
  3. The claim that X-ray data constrain E_p^max to ~20 PeV (observer frame) and that photopion production occurs predominantly with accretion-disk photons is load-bearing for the neutrino estimate, but the manuscript does not quantify the sensitivity of these results to variations in the assumed BLR photon field strength or the precise partitioning between disk and BLR targets.
minor comments (2)
  1. The abstract states the neutrino flux 'peaks at ~1 PeV' but does not specify whether this is the peak of the differential flux or the energy of maximum event rate contribution; clarify in the results section.
  2. Notation for the emission region radius (given as ~10^{16} cm) should be cross-checked against the Doppler factor and observed variability timescale to ensure consistency with the light-crossing time argument.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments, which help clarify the presentation of our multimessenger analysis. We address each major comment below and outline the revisions we will make to strengthen the manuscript.

read point-by-point responses

  1. Referee: The muon-neutrino event rate of ≈0.3 yr^{-1} is obtained by fitting the same one-zone leptohadronic model (with free parameters including maximum proton energy and emission region radius) to the observed X-ray and gamma-ray fluxes; this renders the rate a post-hoc model output rather than an independent prediction, weakening the multimessenger claim (abstract and modeling description).

    Authors: We agree that the neutrino rate is derived from the same leptohadronic model constrained by the broadband SED rather than an a priori independent forecast. This is the standard methodology in multimessenger blazar studies, where electromagnetic data (particularly the X-ray band limiting E_p^max) fix the hadronic parameters to yield a testable neutrino prediction. The resulting rate of ~0.3 yr^{-1} peaking at ~1 PeV is therefore a falsifiable output of the fit. We will revise the abstract and modeling section to explicitly describe the neutrino flux as a model-derived estimate based on the leptohadronic fit, thereby removing any ambiguity about independence while preserving the quantitative multimessenger link. revision: partial

  2. Referee: The central one-zone assumption of a uniform region with radius ~10^{16} cm reproducing the full SED relies on external photon densities from the disk and BLR; given the <6-hour variability, this compactness may imply higher photon densities or stratification that would increase the photopion optical depth and alter both the sub-dominance of hadronic gamma-rays and the neutrino rate (abstract and variability analysis).

    Authors: The emission-region radius R ≈ 10^{16} cm follows directly from the observed <6-hour variability via the light-crossing argument R < c t_var δ / (1+z). The external disk and BLR photon fields are modeled as isotropic target fields whose energy densities are set by the disk luminosity and BLR reprocessing at the blob location (typically 0.1–1 pc), independent of the blob’s internal compactness. Compactness primarily governs the internal synchrotron and SSC photon densities; external Compton and photopion interactions with external photons depend on the external radiation density, which remains unchanged. We will add a clarifying paragraph in the variability-analysis section explaining this separation and noting that possible stratification or enhanced local densities would require multi-zone modeling outside the present one-zone framework. revision: partial

  3. Referee: The claim that X-ray data constrain E_p^max to ~20 PeV (observer frame) and that photopion production occurs predominantly with accretion-disk photons is load-bearing for the neutrino estimate, but the manuscript does not quantify the sensitivity of these results to variations in the assumed BLR photon field strength or the precise partitioning between disk and BLR targets.

    Authors: We acknowledge that a quantitative sensitivity study to BLR strength and disk–BLR partitioning would improve robustness. Our fiducial FSRQ parameters place the blob such that disk photons dominate photopion production because of their higher density and better energy match to the proton spectrum. We will perform additional model runs varying the BLR energy density by factors of 2–3, include the resulting neutrino-rate variations (within a factor of ~2) in a new subsection of the modeling results, and confirm that disk dominance persists. These calculations will be reported in the revised manuscript. revision: yes

Circularity Check

1 steps flagged

Neutrino event rate is direct output of leptohadronic model fitted to X-ray and gamma-ray data

specific steps
  1. fitted input called prediction [Abstract]
    "Our one-zone leptohadronic model shows that the high-energy γ-ray flux is produced by a combination of inverse-Compton scattering of external photons from the hot accretion disk and the broad-line region, while the X-ray emission is dominated by synchrotron self-Compton radiation from relativistic electrons. The secondary radiation from the hadronic cascade is found to be sub-dominant in the γ-ray regime, and the X-ray data constrain the maximum proton energy to ∼ 20 PeV in the observer frame. Photopion production occurs predominantly with accretion-disk photons, resulting in an estimated muon"

    The model parameters are adjusted to match the observed X-ray and γ-ray fluxes (with max proton energy set by X-ray upper limits on hadronic cascade). The neutrino rate is then calculated from the identical photopion interactions and proton distribution inside the same fitted model, so the 0.3 yr^{-1} rate is a direct model output rather than an independent prediction.

full rationale

The paper's multimessenger claim rests on a single one-zone leptohadronic model whose parameters (including proton maximum energy constrained by X-ray data) are tuned to reproduce the observed SED and variability. The quoted muon-neutrino rate of ~0.3 yr^{-1} is then computed from photopion production within that same model, reducing the 'prediction' to a re-expression of the electromagnetic fit rather than an independent derivation. The derivation chain for the neutrino flux therefore collapses to the inputs by construction, though the underlying model physics and external photon fields retain some independent content.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claims rest on a standard one-zone leptohadronic framework whose free parameters are tuned to the observed light curves and spectra; no new particles or forces are introduced.

free parameters (2)
  • maximum proton energy = ~20 PeV
    Constrained to ~20 PeV by X-ray data within the model
  • emission region radius = ~10^16 cm
    Derived from <6-hour variability timescale
axioms (1)
  • domain assumption One-zone leptohadronic emission region suffices to describe the entire broadband spectrum
    Invoked to link gamma-ray, X-ray, and neutrino production

pith-pipeline@v0.9.0 · 5642 in / 1526 out tokens · 48566 ms · 2026-05-09T17:51:17.877005+00:00 · methodology

discussion (0)

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Reference graph

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