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arxiv: 2605.15986 · v1 · pith:HCZ7F4BLnew · submitted 2026-05-15 · 🌌 astro-ph.HE

Temporal evolution of the periodic GeV signal from 4FGL J1913.2+0512 and analysis of the SS 433 / W50 lobes

\"Omer Faruk \c{C}oban , Diego F. Torres , Jian Li , Daniela Hadasch , Agnibha De Sarkar , Matthew Kerr This is my paper

Pith reviewed 2026-05-20 16:21 UTC · model grok-4.3

classification 🌌 astro-ph.HE
keywords SS 433microquasargamma raysFermi LATperiodic modulationprecessiontemporal evolutionW50
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The pith

The 162-day GeV periodicity from 4FGL J1913.2+0512 fades after the first decade of Fermi observations.

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

This paper examines 16 years of Fermi Large Area Telescope data on the SS 433 microquasar and its W50 nebula. It detects a GeV source with a power-law spectrum and identifies a modulation at the 162-day precession period of the jets. The modulation is clear in the early mission data but weakens or vanishes in later years. This suggests that the processes producing gamma rays in the SS 433 environment change over multi-year timescales, which matters because it shows these systems are dynamic rather than static.

Core claim

Using pulsar gating to reduce contamination from a nearby pulsar, the study finds the source 4FGL J1913.2+0512 with test statistic 45 and photon index 2.61. Exposure-corrected periodograms and phase-folded curves reveal a ~162-day signal prominent from 2008-2018 but not after, with flux concentrated in precessional phases 0.0-0.5. The full dataset shows reduced significance due to the later non-modulated period. These results indicate that the efficiency and/or geometry of gamma-ray production evolves on multi-year timescales.

What carries the argument

The time-dependent 162-day periodic modulation in the GeV light curve of 4FGL J1913.2+0512, analyzed through Lomb-Scargle periodograms and precessional phase folding.

If this is right

  • The modulation is tied to the precession but only in the early epoch.
  • Later data dilutes the overall signal.
  • Gamma-ray production geometry or efficiency changes over years.
  • Similar time evolution may occur in other jet systems.

Where Pith is reading between the lines

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

  • If the change is real, it could reflect varying particle acceleration efficiency as the jets interact with the nebula.
  • Multi-wavelength follow-up might reveal if radio or X-ray emissions show related long-term changes.
  • Models of microquasar emission need to incorporate time-variable parameters rather than assuming steady state.

Load-bearing premise

The detected periodicity is assumed to be genuinely linked to the SS 433 jet precession and not an artifact from incomplete removal of the nearby pulsar's signal or background fluctuations.

What would settle it

Continued Fermi observations over the next 5 years that show a return of the strong 162-day modulation with the same phase preference would contradict the claimed evolution toward a non-modulated state.

Figures

Figures reproduced from arXiv: 2605.15986 by Agnibha De Sarkar, Daniela Hadasch, Diego F. Torres, Jian Li, Matthew Kerr, \"Omer Faruk \c{C}oban.

Figure 1
Figure 1. Figure 1: a) Counts map of the Fermi-LAT field around the SS 433 region, constructed from events between 0.1 − 300 GeV. White and green crosses indicate gamma-ray sources in the region, and dashed circles mark the regions used to produce pulse profiles. b) Pulse profile of events within 0.6◦of PSR J1907+0602 above 300 MeV. Two rotational pulse periods are shown with 100 phase bins per period. The off-peak interval i… view at source ↗
Figure 2
Figure 2. Figure 2: Fermi-LAT residual TS map of the SS 433 region during the off-peak phase of PSR J1907+0602 in the 0.3 − 300 GeV band. All 4FGL-DR4 sources are modelled and subtracted, except for the main source of interest, 4FGL J1913.2+0512, which is excluded from the model to highlight its unmodelled emission. The 95% confidence level localization regions of 4FGL J1913.2+0512 and the Western Excess are indicated with gr… view at source ↗
Figure 3
Figure 3. Figure 3: Spectral energy distributions (SEDs) of (a) 4FGL J1913.2+0512, (b) West Excess, and (c) Fermi J1909.6+0552 in the 0.3 − 300 GeV energy range. The black points represent the Fermi-LAT measurements with 1𝜎 statistical uncertainties, while the downward arrows indicate 95% confidence level upper limits for energy bins with TS < 4. The dashed lines show the best-fitting power-law models [PITH_FULL_IMAGE:figure… view at source ↗
Figure 4
Figure 4. Figure 4: Exposure-corrected Lomb-Scargle periodograms constructed from the 1 − 300 GeV weighted light curve of 4FGL J1913.2+0512 over different time intervals: (a) 5 years, (b) 5 − 10 years, (c) 10 − 16 years, (d) 10 years, and (e) 16 years. The blue curve represents the normalized power, while the red dashed lines indicate the 1% and 5% false-alarm significance levels computed over the 145–175 day range, accountin… view at source ↗
Figure 5
Figure 5. Figure 5: a) Phase-folded TS Maps of the SS 433 region in the 1 − 300 GeV band in the precessional phases 0.0 − 0.5 (left) and 0.5 − 1.0 (right), computed with 4FGL J1913.2+0512 excluded in the model and a test-source photon index Γ = 2.0. The East Excess is produced by only three photons; see the text for further discussion. b) Same as panel a, but using Γts = 3.2, corresponding to the best-fit photon index of 4FGL… view at source ↗
Figure 6
Figure 6. Figure 6: TS evolution of 4FGL J1913.2+0512 in the 1 − 300 GeV band for precessional phases 0.0 − 0.5 (green) and 0.5 − 1.0 (purple). radiation field parameters at the position of the west lobe there￾fore are 𝑇CMB = 2.73 K, 𝜖CMB = 0.26 eV cm−3 , 𝑇FIR = 50 K, 𝜖FIR = 5.3 eV cm−3 , 𝑇NIR = 5000 K, and 𝜖NIR = 12 eV cm−3 , re￾spectively. Assuming the same source distance and age, we let the free parameters 𝛼e, 𝐿e and 𝐵 va… view at source ↗
Figure 7
Figure 7. Figure 7: Multiwavelength spectral energy distribution (SED) of the West Excess obtained with Fermi-LAT (this work), H.E.S.S. (Aharonian et al. 2024), and LHAASO (Cao et al. 2025). Vertical bars represent 1𝜎 uncertainties, while downward arrows indicate 95% confidence level upper limits. Model curves from Fang et al. (2020), Aharonian et al. (2024), and Sudoh et al. (2020) are shown for reference. The middle and rig… view at source ↗
read the original abstract

SS 433 is a microquasar whose relativistic jets precess every ~162 days, providing a laboratory for jet-interstellar medium interactions. We present a comprehensive analysis of 16 years of Fermi Large Area Telescope data (August 2008-September 2024) of the SS 433/W50 field, using events in the 0.3-300 GeV range and employing pulsar gating to mitigate contamination from the bright nearby pulsar PSR J1907+0602. We detect the GeV source 4FGL J1913.2+0512 (TS = 45, where TS denotes the likelihood-ratio Test Statistic) with a power-law spectrum (photon index 2.61 +- 0.08) and confirm a GeV excess at the western lobe (TS = 17). The eastern lobe of SS 433 is hinted at with lower significance. One additional GeV excess, Fermi J1909.6+0552 (TS = 20; TS = 28 over 0.1-300 GeV), located outside the SS 433 / W50 system, is revealed after gating. Exposure-corrected Lomb-Scargle periodograms and precessional phase-folded light curves show a ~162-day modulation in 4FGL J1913.2+0512. This periodicity is prominent during the first 10 years of the mission (2008-2018) but disappears thereafter, with the phase-folded flux concentrated in precessional phases 0.0-0.5. Over the full 16-year dataset, the modulation remains detectable but with reduced significance, consistent with dilution by the later non-modulated epoch. These results indicate that the efficiency and/or geometry of gamma-ray production in the SS 433 environment evolves on multi-year timescales.

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 analyzes 16 years of Fermi LAT data (0.3-300 GeV) on the SS 433/W50 field, applying pulsar gating to mitigate contamination from PSR J1907+0602. It reports a detection of 4FGL J1913.2+0512 (TS=45, power-law index 2.61±0.08) and a GeV excess at the western lobe (TS=17), with a hint at the eastern lobe. Exposure-corrected Lomb-Scargle periodograms and precessional phase-folding reveal a ~162-day modulation in 4FGL J1913.2+0512 that is prominent in 2008-2018 but disappears thereafter, with flux concentrated in phases 0.0-0.5; over the full dataset the modulation is weaker but still detectable. The authors conclude that the efficiency and/or geometry of gamma-ray production in the SS 433 environment evolves on multi-year timescales.

Significance. If the association of the 162-day signal with SS 433 precession and the physical nature of the post-2018 dilution are robust, the result would be significant for high-energy astrophysics. It would provide direct evidence for long-term changes in gamma-ray production within a well-studied microquasar system, with implications for jet-ISM interaction models. The analysis uses public Fermi data and standard, reproducible tools (exposure-corrected Lomb-Scargle periodograms and phase-folding) together with quantitative TS values, which strengthens the observational basis.

major comments (2)
  1. [Abstract] The central claim of multi-year evolution in gamma-ray production efficiency/geometry rests on the 162-day modulation being physically tied to SS 433 precession rather than residual pulsar contamination or background effects. The abstract reports the signal is prominent 2008-2018 but diluted later, yet provides no quantitative test (e.g., TS or amplitude comparison with/without gating in the post-2018 epoch) that would rule out a time-dependent analysis artifact.
  2. [Data Analysis] The analysis assumes pulsar gating successfully removes contamination from PSR J1907+0602 without introducing artifacts that could dilute the modulation after ~2018. No explicit check for gating performance across mission epochs or cross-check against the pulsar's own timing properties is described, which is load-bearing for interpreting the temporal change as physical.
minor comments (2)
  1. The abstract lacks details on background modeling, systematic uncertainties, and exact data selection criteria, which would improve clarity and allow readers to assess robustness.
  2. Consider adding a table or figure panel that directly compares modulation significance (TS or amplitude) across the 2008-2018 and post-2018 epochs to make the temporal evolution more quantitative.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. We address each major comment below and indicate where revisions will be made to strengthen the presentation and address the concerns raised.

read point-by-point responses

  1. Referee: [Abstract] The central claim of multi-year evolution in gamma-ray production efficiency/geometry rests on the 162-day modulation being physically tied to SS 433 precession rather than residual pulsar contamination or background effects. The abstract reports the signal is prominent 2008-2018 but diluted later, yet provides no quantitative test (e.g., TS or amplitude comparison with/without gating in the post-2018 epoch) that would rule out a time-dependent analysis artifact.

    Authors: We agree that including a quantitative comparison of the post-2018 epoch with and without gating would make the argument more robust. In the revised manuscript we will add a table (or supplementary figure) that reports the TS values and modulation amplitudes for 2019–2024 both with and without pulsar gating applied. This will explicitly demonstrate that the dilution of the 162-day signal is not introduced by the gating procedure itself. The existing phase-folded light curves already show flux concentration in phases 0.0–0.5 during the earlier epoch, which is difficult to attribute to a time-dependent background artifact. revision: yes

  2. Referee: [Data Analysis] The analysis assumes pulsar gating successfully removes contamination from PSR J1907+0602 without introducing artifacts that could dilute the modulation after ~2018. No explicit check for gating performance across mission epochs or cross-check against the pulsar's own timing properties is described, which is load-bearing for interpreting the temporal change as physical.

    Authors: The gating is performed with the publicly available ephemeris for PSR J1907+0602, which is stable over the Fermi mission. Nevertheless, we acknowledge that an explicit verification of gating performance across epochs would be helpful. In the revision we will add a short subsection (or appendix) that (i) compares the pulsed flux of PSR J1907+0602 in the two epochs to confirm no secular change in the pulsar itself, and (ii) shows that the off-pulse residual maps remain consistent before and after 2018. These checks will support the interpretation that the observed change in the 162-day modulation is astrophysical rather than an analysis artifact. revision: yes

Circularity Check

0 steps flagged

No significant circularity in direct observational analysis

full rationale

The paper performs standard Fermi LAT data analysis on public observations: pulsar gating to reduce contamination, likelihood source detection yielding TS values, power-law spectral fits, exposure-corrected Lomb-Scargle periodograms, and precessional phase-folding of light curves. The central claim of multi-year evolution in gamma-ray production follows directly from splitting the 16-year dataset into epochs (2008-2018 vs post-2018) and comparing modulation significance and amplitude in each; this is a data-driven comparison with no mathematical derivation, no fitted parameter renamed as a prediction, and no load-bearing self-citation chain. The analysis chain is self-contained against external benchmarks such as standard periodicity tools and does not reduce any result to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This observational study relies on established Fermi LAT analysis pipelines and public data rather than new theoretical constructs; standard background and instrument assumptions are invoked without explicit deviation.

axioms (1)
  • domain assumption Standard Fermi LAT background emission models and instrument response functions are adequate for the SS 433 field after pulsar gating.
    The analysis employs established tools without reporting custom modifications to background or response models.

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Reference graph

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