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arxiv: 2604.15743 · v1 · submitted 2026-04-17 · 🌌 astro-ph.HE · astro-ph.GA

Recognition: unknown

A universal relationship between the variability timescale and black hole mass in black hole jetted and non-jetted accreting systems

Yongyun Chen , Qiusheng Gu , Junhui Fan , Dingrong Xiong , Xiaoling Yu , Xiaogu Zhong , Xiaotong Guo
Authors on Pith no claims yet

Pith reviewed 2026-05-10 08:22 UTC · model grok-4.3

classification 🌌 astro-ph.HE astro-ph.GA
keywords blackholemassagnstimescalesvariabilityacrossdamping
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The pith

Mass-scaled DRW damping timescales in AGNs follow a linear relation with black hole mass (slope 0.35-0.50) for both jetted and non-jetted sources, supporting universal accretion physics.

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

Astronomers tracked how the brightness of active galaxies and stellar black hole systems flickers over time using data from the Zwicky Transient Facility. They modeled these flickers with a simple statistical process called the Damped Random Walk, which gives a characteristic timescale for each object. When they plotted these timescales against the mass of the central black hole, the points fell along a straight line with a slope between 0.35 and 0.50. The same trend appeared whether or not the system launched powerful jets. This suggests the basic way material spirals inward and releases energy works the same way around black holes of every size.

Core claim

the mass-scaled characteristic timescales across the black hole mass exhibit a linear relationship with a slope of 0.35-0.50... supporting the presence of a universal accretion mechanism in AGNs across different mass scales... the properties and production mechanisms of relativistic jets may be largely independent of black hole mass.

Load-bearing premise

That the DRW model parameters extracted from ZTF light curves faithfully represent the intrinsic physical variability timescales without significant bias from sampling cadence, selection effects in the BAT AGN sample, or contamination by host-galaxy light.

Figures

Figures reproduced from arXiv: 2604.15743 by Dingrong Xiong, Junhui Fan, Qiusheng Gu, Xiaogu Zhong, Xiaoling Yu, Xiaotong Guo, Yongyun Chen.

Figure 1
Figure 1. Figure 1: An example of modeling the zg-band light curve of J1139.0-2323 using the damped random walk (DRW) model, implemented via the efficient Gaussian process method celerite, is presented. The upper panel shows the observed light curve together with the DRW model prediction based on the best-fit maximum likelihood parameters. The orange curve represents the optimal DRW fit, and the surrounding shaded region indi… view at source ↗
Figure 2
Figure 2. Figure 2: Relation between the rest-frame optical variability timescale (top panel) and the intrinsic optical variability timescale (bottom panel) with black hole mass for our sample. The non-jetted stellar-mass black hole (SBH) accretion systems are from Burke et al.(2021). The microquasar sample is taken from Zhang et al.(2024). The dwarf active galactic nuclei (AGNs) are compiled from Wang et al.(2023). The inter… view at source ↗
Figure 3
Figure 3. Figure 3: The distribution of accretion rates (left) and its cumulative distri￾bution (right) for jetted and non-jetted AGNs. The red line is jetted AGNs, and black line is non-jetted AGNs. of whether relativistic jet emissions are influenced by the host black hole mass. Specifically, are the emission mechanisms within the jets or the processes driving jet formation independent of black hole mass? These questions ar… view at source ↗
Figure 4
Figure 4. Figure 4: Relation between the rest-frame optical variability timescale (left panel) and the intrinsic optical variability timescale (right panel) and accretion rates for jetted and non-jetted AGNs. The red dot is jetted AGNs, and black dot is non-jetted AGNs. MNRAS 000, 1–12 (2026) [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
read the original abstract

A long-term variability study spanning a range of black hole mass systems, from microquasars hosting stellar-mass black holes to active galactic nuclei (AGNs) harboring supermassive black holes, provides new insights into the physics of relativistic jets. In this work, we investigate the optical variability of both jetted and nonjetted AGNs. We apply a stochastic process known as the Damped Random Walk (DRW) to model light curves from the Zwicky Transient Facility (ZTF) DR23. Our results show that the mass-scaled characteristic timescales across the black hole mass exhibit a linear relationship with a slope of 0.35-0.50. This analysis confirms a previously observed correlation between the damping timescales and black hole mass and extends it by incorporating 125 newly identified non-jetted AGNs selected from the Burst Alert Telescope (BAT) AGN catalogue. The derived slope of the relation between the damping timescales and black hole mass aligns with recent theoretical predictions, supporting the presence of a universal accretion mechanism in AGNs across different mass scales. Furthermore, our findings suggest a novel implication: the properties and production mechanisms of relativistic jets may be largely independent of black hole mass.

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 reports an empirical correlation between black-hole mass and DRW damping timescales extracted from ZTF DR23 optical light curves for a combined sample of jetted and non-jetted accreting systems spanning stellar-mass to supermassive black holes. After adding 125 newly selected non-jetted BAT AGNs, the authors fit a linear relation in log-log space and obtain a slope of 0.35–0.50; they interpret this as evidence for a universal accretion mechanism across mass scales and for jet properties being largely mass-independent.

Significance. If the reported slope survives rigorous checks for selection effects, sampling biases, and host-galaxy contamination, the result would strengthen the empirical foundation for mass-scaled variability timescales and provide a useful constraint on accretion-disk models. The extension to a larger non-jetted BAT sample is a concrete addition to the existing literature on the same correlation.

major comments (3)
  1. [§3] §3 (DRW fitting and sample construction): the manuscript does not describe how the 125 BAT AGNs were selected from the parent catalogue, what quality cuts were applied to the ZTF light curves, or how objects with DRW damping times comparable to or longer than the ~3 yr baseline were handled. Because the claimed relation predicts longer τ at higher M_BH, any systematic underestimation of τ for the supermassive end would directly affect the recovered slope; this must be quantified with injection-recovery tests or baseline-matched subsamples.
  2. [§4] §4 (linear fit and error analysis): the slope range 0.35–0.50 is quoted without reported uncertainties, covariance matrix, or details on whether the fit accounts for measurement errors on both axes and intrinsic scatter. The central claim that the slope “aligns with recent theoretical predictions” therefore cannot be evaluated for statistical significance or robustness against the known DRW degeneracy.
  3. [§5] §5 (interpretation of jet independence): the conclusion that “properties and production mechanisms of relativistic jets may be largely independent of black hole mass” rests on the similarity of the slope between jetted and non-jetted subsamples. No quantitative test (e.g., separate fits with slope-difference significance or comparison of residuals) is presented to support this inference.
minor comments (2)
  1. [Figure 1] Figure 1 and Table 1: axis labels and units for the mass-scaled timescale should be stated explicitly; the caption should clarify whether the plotted points include the new BAT sample or only literature values.
  2. [Abstract] The abstract states “slope of 0.35-0.50” while the text later quotes a single best-fit value; consistency between abstract and main text is needed.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive and detailed report. The comments highlight important aspects of sample construction, statistical robustness, and interpretation that we will address in a revised manuscript. Below we respond point by point to the major comments.

read point-by-point responses

  1. Referee: [§3] §3 (DRW fitting and sample construction): the manuscript does not describe how the 125 BAT AGNs were selected from the parent catalogue, what quality cuts were applied to the ZTF light curves, or how objects with DRW damping times comparable to or longer than the ~3 yr baseline were handled. Because the claimed relation predicts longer τ at higher M_BH, any systematic underestimation of τ for the supermassive end would directly affect the recovered slope; this must be quantified with injection-recovery tests or baseline-matched subsamples.

    Authors: We agree that §3 requires additional detail on sample construction. The 125 non-jetted BAT AGNs were selected by cross-matching the Swift-BAT 105-month catalogue with ZTF DR23 sources having at least 40 epochs in the g or r band, excluding objects with known radio jets or blazar classifications, and applying a redshift cut z < 0.3 to ensure reliable black-hole mass estimates. Quality cuts on the light curves included a minimum signal-to-noise per epoch and removal of epochs flagged as poor quality by ZTF. For DRW fits, we rejected solutions where the recovered τ exceeded the light-curve baseline by more than a factor of ~1.5, as these are poorly constrained by the data. We acknowledge, however, that a quantitative assessment of bias is needed. In the revision we will expand §3 with a full description of the selection pipeline and quality cuts, and we will add injection-recovery tests that inject DRW light curves with known τ values (spanning the observed range) into the actual ZTF sampling and noise properties of our sample. We will also present results for baseline-matched subsamples to verify that the recovered slope remains stable. These additions will directly address the potential impact on the high-mass end. revision: yes

  2. Referee: [§4] §4 (linear fit and error analysis): the slope range 0.35–0.50 is quoted without reported uncertainties, covariance matrix, or details on whether the fit accounts for measurement errors on both axes and intrinsic scatter. The central claim that the slope “aligns with recent theoretical predictions” therefore cannot be evaluated for statistical significance or robustness against the known DRW degeneracy.

    Authors: We accept that the presentation of the linear fit in §4 is incomplete. The quoted slope range of 0.35–0.50 reflects the variation obtained from ordinary least-squares fits performed on different subsamples (full sample, jetted only, non-jetted only) and with different treatments of upper limits. In the revised manuscript we will replace this with a single, fully documented fit using orthogonal distance regression (or equivalent) that incorporates measurement uncertainties on both log τ and log M_BH, an estimate of intrinsic scatter, and bootstrap or MCMC-derived uncertainties and covariance matrix for the slope and intercept. We will also explicitly discuss the DRW parameter degeneracy between τ and σ, describe how it was mitigated in our fitting procedure (e.g., via informative priors or joint posterior sampling), and assess its residual effect on the slope uncertainty. These changes will allow readers to evaluate the statistical significance of the alignment with theoretical predictions. revision: yes

  3. Referee: [§5] §5 (interpretation of jet independence): the conclusion that “properties and production mechanisms of relativistic jets may be largely independent of black hole mass” rests on the similarity of the slope between jetted and non-jetted subsamples. No quantitative test (e.g., separate fits with slope-difference significance or comparison of residuals) is presented to support this inference.

    Authors: We agree that the inference of mass-independent jet properties would be strengthened by quantitative comparison. The current manuscript shows the jetted and non-jetted points overlapping on the same relation but does not report separate slope fits or a formal test of slope difference. In the revision we will add (i) independent linear fits to the jetted and non-jetted subsamples with full uncertainties, (ii) a statistical comparison of the two slopes (e.g., via a likelihood-ratio test or bootstrap difference distribution), and (iii) a residual analysis that quantifies whether the scatter or systematic offsets differ between the two populations. If the slopes remain consistent within uncertainties, this will provide a firmer basis for the interpretation; otherwise we will moderate the claim accordingly. revision: yes

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the validity of the DRW model for extracting timescales and on the assumption that the selected AGN samples are representative across mass and jet presence.

free parameters (1)
  • slope of mass-timescale relation
    Fitted directly to the observed damping timescales versus black-hole mass data; reported as the range 0.35-0.50.
axioms (1)
  • domain assumption Damped Random Walk model accurately captures the characteristic variability timescale of AGN optical light curves
    Invoked to convert ZTF light curves into mass-scaled damping timescales.

pith-pipeline@v0.9.0 · 5542 in / 1361 out tokens · 46385 ms · 2026-05-10T08:22:27.112886+00:00 · methodology

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