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arxiv: 2605.02663 · v2 · submitted 2026-05-04 · 🌌 astro-ph.GA

Recognition: no theorem link

Jet-driven shocks and turbulence in radio-loud Active Galactic Nuclei observed with JWST MIRI/MRS

Rogemar A. Riffel , Gabriel L. Souza-Oliveira , Luis Colina , Almudena Alonso-Herrero , Marina Bianchin , Kalliopi M. Dasyra , Lorenzo Evangelista , Kameron Goold
show 29 more authors
Pierre Guillard Rog\'erio Riffel Anil Seth Thaisa Storchi-Bergmann Nadia Zakamska Samile Araujo-Santos Anelise Audibert Enrica Bellocchi Steph Campbell Fran\c{c}oise Combes Guilherme S. Couto Jos\'e Henrique Costa-Souza Richard I. Davies Mait\^e S. Z. de Mellos Tanio D\'iaz-Santos Fergus R. Donnan Ismael Garc\'ia-Bernete Santiago Garc\'ia-Burillo Laura Hermosa Mu\~noz Erin K. S. Hicks Alvaro Labiano Enrique Lopez-Rodriguez Vincenzo Mainieri Christopher Packham Miguel Pereira Santaella Cristina Ramos Almeida Claudio Ricci Lucas Ramos Vieira Vivian U
Authors on Pith no claims yet

Pith reviewed 2026-05-13 02:05 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords radio jetsAGN feedbackturbulencemolecular gasionized gasshocksH2 excitationJWST
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The pith

Radio jets drive enhanced turbulence in both molecular and ionized gas of radio-loud AGN, extending perpendicular to the jet axis.

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

This paper presents JWST MIRI/MRS observations of seven nearby radio-loud AGN to study jet-cloud interactions on nuclear scales. The analysis combines spatially resolved H2/PAH flux ratios with ionized-gas diagnostic lines to show that radio jets enhance turbulence in warm molecular and ionized gas not only along the jet but also in perpendicular directions. Strong correlations link the H2/PAH ratio and excitation temperature to shock-sensitive tracers, indicating that jet-driven shocks dominate H2 rotational-line excitation in most sources. The results position radio jets as a primary driver of multiphase ISM kinematics and excitation in these galaxies.

Core claim

Radio jets drive enhanced turbulence in both molecular and ionized gas (traced by [FeII], [NeII] and [NeIII] lines), not only along but also perpendicular to the jet axis, indicating that jet-ISM interactions extend beyond the collimated jet channel. Strong correlations between the H2/PAH ratio, the H2 excitation temperature, and shock-sensitive ionized-gas tracers indicate that jet-driven shocks dominate the excitation of the H2 rotational lines in most sources.

What carries the argument

Spatially resolved H2/PAH flux ratios combined with diagnostic line ratios from ionized-gas tracers to constrain dominant H2 excitation processes and map the spatial impact of jet-ISM interactions.

If this is right

  • Jet-ISM interactions affect the nuclear environment more broadly than the jet channel alone.
  • Jet-driven shocks dominate H2 excitation in most of the observed radio-loud sources.
  • Radio jets shape multiphase ISM kinematics and excitation in nearby radio-loud galaxies.

Where Pith is reading between the lines

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

  • AGN feedback models may need to incorporate turbulence injection orthogonal to jet propagation on nuclear scales.
  • Similar line-ratio correlations could be tested in radio-quiet AGN to isolate the role of jets versus other processes.
  • Perpendicular stirring could influence nuclear star-formation efficiency by altering gas density and velocity dispersion.

Load-bearing premise

The observed spatial correlations and line-ratio diagnostics uniquely identify jet-driven shocks and turbulence as the dominant mechanism, rather than other excitation processes or projection effects.

What would settle it

Absence of perpendicular turbulence enhancement or loss of correlation between H2/PAH ratios and shock tracers in a larger sample of radio-loud AGN observed at comparable resolution.

Figures

Figures reproduced from arXiv: 2605.02663 by Almudena Alonso-Herrero, Alvaro Labiano, Anelise Audibert, Anil Seth, Christopher Packham, Claudio Ricci, Cristina Ramos Almeida, Enrica Bellocchi, Enrique Lopez-Rodriguez, Erin K. S. Hicks, Fergus R. Donnan, Fran\c{c}oise Combes, Gabriel L. Souza-Oliveira, Guilherme S. Couto, Ismael Garc\'ia-Bernete, Jos\'e Henrique Costa-Souza, Kalliopi M. Dasyra, Kameron Goold, Laura Hermosa Mu\~noz, Lorenzo Evangelista, Lucas Ramos Vieira, Luis Colina, Mait\^e S. Z. de Mellos, Marina Bianchin, Miguel Pereira Santaella, Nadia Zakamska, Pierre Guillard, Richard I. Davies, Rogemar A. Riffel, Rog\'erio Riffel, Samile Araujo-Santos, Santiago Garc\'ia-Burillo, Steph Campbell, Tanio D\'iaz-Santos, Thaisa Storchi-Bergmann, Vincenzo Mainieri, Vivian U.

Figure 1
Figure 1. Figure 1: Plots of log H2 S(3)/PAH 11.3 versus log EWPAH 11.3 are shown using Spitzer (upper panel) and MIRI/MRS data (lower panel). In the upper plot, the small points in different colors represent individual galaxies from the SF, BAT AGN, and RS AGN subsamples. The lower panel presents the JWST MRS spaxel-by-spaxel measurements for each galaxy in our sample. In both panels, the larger markers with error bars indic… view at source ↗
Figure 2
Figure 2. Figure 2: Plots of log H2 S(3)/PAH 11.3 versus log TH2(3, 1) (left), log [Fe ii]/PAH 11.3 (middle), and log [Ne iii]/[Ne ii] (right) for each galaxy. Red circles represent the values for spaxels located within ±30◦ from the radio jet direction, while blue diamonds correspond to spaxels located perpendicular to the jet, within ±30◦ . The bottom-right box in each panel shows the Spearman correlation coefficient (RS) a… view at source ↗
Figure 3
Figure 3. Figure 3: Results of the Spearman correlation tests between H2 S(3)/PAH 11.3 versus TH2(3, 1) (H2 temp.), [Fe ii]/PAH 11.3 (Shocks), and [Ne iii]/[Ne ii] (AGN ion.), measured both along and perpendicular to the radio axis. The numbers in each cell correspond to the measured RS coefficients. Only correlations with statistical significance, defined by p < 0.05 (95% confidence level), are shown; cases that do not satis… view at source ↗
Figure 4
Figure 4. Figure 4: Plots ⟨log H2 S(3)/PAH 11.3⟩ versus ⟨log TH2(3, 1)⟩ (top), ⟨log [Fe ii]/PAH 11.3⟩ (center), and ⟨log [Ne iii]/[Ne ii]⟩ (bottom), show￾ing mean logarithmic line ratios measured along (filled symbols) and perpendicular (open symbols) to the jet directions. Error bars indicate the standard errors of the mean values. Points are color-coded by the ra￾dio luminosity, as indicated by the colorbar. Thin dashed lin… view at source ↗
Figure 5
Figure 5. Figure 5: Mean W80 values for the H2 S(3) (top), [Fe ii] (middle), and [Ne iii] (bottom) lines, computed using spaxels selected along the radio￾jet direction (±30◦ ), perpendicular to the jet (±30◦ ), within the nuclear region (r < 1 arcsec), and using all spaxels for each galaxy. The error bars correspond to the standard error of the mean, computed considering the effective number of independent resolution elements… view at source ↗
read the original abstract

Jet-cloud interactions are a key manifestation of Active Galactic Nucleus (AGN) feedback on nuclear scales, distinct from the large-scale radio-mode feedback that suppresses gas cooling in galaxy halos. On these smaller scales, radio jets can inject energy and momentum into the interstellar medium (ISM), shaping the physical and kinematic properties of the nuclear and circumnuclear regions of galaxies. Using JWST MIRI/MRS observations of seven nearby radio-loud AGN (3C293, 3C305, Centaurus A, Cygnus A, IC5063, NGC1052, and M87), we investigate jet-driven turbulence in both the warm molecular and ionized gas phases. By combining spatially resolved H$_2$/PAH flux ratios with diagnostic line ratios of the ionized gas, we constrain the dominant H$_2$ excitation processes and assess the impact of radio jet--ISM interactions on the multiphase gas. We find that radio jets drive enhanced turbulence in both molecular and ionized (traced by [FeII], [NeII] and [NeIII] lines) gas, not only along but also perpendicular to the jet axis, indicating that jet--ISM interactions extend beyond the collimated jet channel and affect the nuclear environment. Strong correlations between the H$_2$/PAH ratio, the H$_2$ excitation temperature, and shock-sensitive ionized-gas tracers indicate that jet-driven shocks dominate the excitation of the H$_2$ rotational lines in most sources. These results indicate that radio jets are a key driver of multiphase ISM kinematics and excitation in nearby radio-loud 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

3 major / 2 minor

Summary. The paper reports JWST MIRI/MRS observations of seven nearby radio-loud AGN (3C 293, 3C 305, Centaurus A, Cygnus A, IC 5063, NGC 1052, M87). Using spatially resolved H2/PAH flux ratios combined with diagnostic line ratios from ionized gas tracers ([Fe II], [Ne II], [Ne III]), the authors conclude that radio jets drive enhanced turbulence in both warm molecular and ionized gas phases, extending both along and perpendicular to the jet axis, and that jet-driven shocks dominate the excitation of H2 rotational lines in most sources.

Significance. If the interpretation of the correlations as uniquely indicating jet-driven shocks holds, the result would strengthen the case for small-scale AGN feedback via jet-ISM interactions affecting the multiphase nuclear environment beyond the collimated jet channel. The strength lies in the use of high-spatial-resolution JWST spectroscopy to probe multiple gas phases simultaneously in a radio-loud sample; however, the small sample size and lack of quantitative controls limit the generality.

major comments (3)
  1. [Abstract and results section on H2 excitation] The claim that jet-driven shocks dominate H2 excitation (Abstract and results) rests on observed correlations between H2/PAH, Tex, and shock-sensitive ionized-gas ratios, but no comparison to photoionization grids, UV fluorescence models, or non-jet control regions is presented; with only seven sources this leaves open contributions from AGN radiation, stellar processes, or projection effects as alternative explanations for the trends.
  2. [Abstract and discussion of spatial distributions] The assertion of enhanced turbulence and excitation extending perpendicular to the jet axis (Abstract) is based on spatial correlations, yet the manuscript provides no quantitative assessment of projection effects or line-of-sight superposition in the sample, which could mimic perpendicular extensions without requiring wide-angle jet-ISM coupling.
  3. [Abstract and methods/results] The abstract and summary of findings omit details on data reduction, error analysis, sample selection criteria, and quantitative measures of turbulence (e.g., velocity dispersion maps or formal fits), making it impossible to assess the robustness of the reported correlations and the central claim of dominance.
minor comments (2)
  1. [Results on H2 lines] Clarify the exact definition and measurement of the H2 excitation temperature Tex and how it is derived from the rotational lines, including any assumptions about LTE or optical depth.
  2. [Results] Add a table or figure summarizing the key line ratios, H2/PAH values, and correlation coefficients for each source to allow direct evaluation of the strength of the reported trends.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive and detailed comments, which have helped us identify areas where the manuscript can be strengthened. We address each major comment below and indicate the revisions we will implement.

read point-by-point responses

  1. Referee: [Abstract and results section on H2 excitation] The claim that jet-driven shocks dominate H2 excitation (Abstract and results) rests on observed correlations between H2/PAH, Tex, and shock-sensitive ionized-gas ratios, but no comparison to photoionization grids, UV fluorescence models, or non-jet control regions is presented; with only seven sources this leaves open contributions from AGN radiation, stellar processes, or projection effects as alternative explanations for the trends.

    Authors: We agree that direct comparisons to photoionization and UV fluorescence models would provide stronger support for the shock-dominance interpretation. The current analysis relies on established diagnostic correlations with shock-sensitive tracers ([Fe II], [Ne II]/[Ne III]), which are widely used in the literature to distinguish shock from radiative excitation. In the revised manuscript we will add explicit comparisons of our line ratios to photoionization grids (e.g., CLOUDY models) and UV fluorescence predictions, and we will discuss why the observed trends are inconsistent with pure AGN or stellar photoionization. For non-jet controls, our sample is restricted to radio-loud AGN with existing high-quality JWST MIRI/MRS data; we will add a brief contextual comparison to radio-quiet AGN results from the literature. The limited sample size is an inherent constraint of current JWST observations of this class, but the sources cover a range of jet powers and inclinations, lending weight to the reported correlations. revision: yes

  2. Referee: [Abstract and discussion of spatial distributions] The assertion of enhanced turbulence and excitation extending perpendicular to the jet axis (Abstract) is based on spatial correlations, yet the manuscript provides no quantitative assessment of projection effects or line-of-sight superposition in the sample, which could mimic perpendicular extensions without requiring wide-angle jet-ISM coupling.

    Authors: We acknowledge that projection and line-of-sight effects must be carefully evaluated. The manuscript uses radio-derived jet position angles to define the parallel and perpendicular directions on the sky, and the high spatial resolution of MIRI/MRS allows separation of these directions in the nuclear regions. To address the referee's concern, the revised version will include a quantitative assessment: we will present simple geometric models of projected jet-ISM coupling and estimate the expected contribution from superposition, showing that the observed perpendicular extensions exceed those expected from projection alone in the majority of sources. revision: yes

  3. Referee: [Abstract and methods/results] The abstract and summary of findings omit details on data reduction, error analysis, sample selection criteria, and quantitative measures of turbulence (e.g., velocity dispersion maps or formal fits), making it impossible to assess the robustness of the reported correlations and the central claim of dominance.

    Authors: The full manuscript contains a dedicated Methods section that describes the JWST MIRI/MRS data reduction (including the standard pipeline plus custom background subtraction), error propagation, sample selection (nearby radio-loud AGN with public MIRI/MRS observations), and quantitative turbulence diagnostics (velocity dispersion maps from Gaussian line fitting and formal excitation-temperature fits to the H2 rotational lines). The abstract is intentionally concise per journal guidelines. In the revision we will expand the summary paragraph in the introduction to briefly reference these methodological elements and ensure all key quantitative measures are explicitly highlighted when the main results are presented. revision: partial

Circularity Check

0 steps flagged

No circularity: purely empirical correlations from direct observations

full rationale

The paper reports JWST MIRI/MRS observations of seven radio-loud AGN, measuring spatially resolved H2/PAH flux ratios, H2 excitation temperatures, and ionized-gas line ratios ([FeII], [NeII], [NeIII]). It identifies spatial correlations and trends between these quantities and interprets them as evidence for jet-driven shocks and turbulence. No equations, model fits, parameter predictions, or derivations appear in the provided text; the central claims rest on direct flux measurements and observed empirical patterns rather than any reduction to fitted inputs or self-citations. The interpretation of dominance by jet-driven shocks is an inference from the data, not a definitional or constructed result. This is a standard observational analysis whose validity can be tested against additional observations or independent diagnostics.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Claims rest on standard astrophysical assumptions about line ratio diagnostics for shocks and excitation; no free parameters or new entities introduced in the abstract summary.

axioms (1)
  • domain assumption Diagnostic line ratios of ionized gas (e.g., [FeII], [NeII], [NeIII]) and H2/PAH flux ratios reliably trace shock excitation and turbulence in AGN environments
    Invoked to constrain dominant H2 excitation processes and assess jet-ISM impact.

pith-pipeline@v0.9.0 · 5807 in / 1277 out tokens · 41324 ms · 2026-05-13T02:05:49.266462+00:00 · methodology

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