Recognition: unknown
NOEMA3D: Resolving radial gas flows in disk galaxies at z~1.1-1.6 with high-resolution CO observations
Pith reviewed 2026-05-10 04:25 UTC · model grok-4.3
The pith
High-resolution CO observations show that spiral arms and bars in z~1-2 disk galaxies drive molecular gas inflows at rates comparable to star formation.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
After modeling the axisymmetric rotation with DysmalPy, we reveal spatially coherent velocity residuals in all but one more inclined system. The inferred in-plane non-circular motions reach amplitudes of ~50-100 km/s. Interpreting these non-circular motions as radial flows we find that the velocity residuals spatially coincide with non-axisymmetric structures -- spiral arms and bars -- demonstrating a direct link between galaxy morphology and gas transport at z ~ 1-2. In spiral galaxies, the residual velocity patterns are typically dominated by inflows, while barred systems display an apparent inflow-outflow pattern. We further find that the inferred molecular gas inflow rates are of the the
What carries the argument
Velocity residuals after subtraction of axisymmetric rotation via DysmalPy forward modeling, whose spatial alignment with JWST-detected spiral arms and bars is used to infer in-plane radial gas flows.
Load-bearing premise
That the observed velocity residuals represent purely in-plane radial flows driven by the morphological features rather than warps, vertical motions, outflows, or modeling imperfections.
What would settle it
If independent kinematic modeling that includes warps or vertical velocities removes the residuals or if the residuals show no spatial correlation with the locations of spiral arms and bars.
Figures
read the original abstract
We present NOEMA3D, a unique high-resolution study of purely molecular gas kinematics at $z \sim 1.1$ to 1.6, providing a dedicated view of cold gas dynamics at the late stages of the peak epoch of cosmic star formation. Using deep ($> 20$ hr on source per target) IRAM-NOEMA CO observations of 10 massive ($10.45 < \log(M^*/M_\odot) < 11.43$)) main-sequence galaxies, complemented by high-resolution JWST imaging, we resolve the molecular gas kinematics and morphology on kiloparsec scales. We find that all galaxies exhibit ordered rotation with moderate intrinsic turbulence (median $\sigma_0 \sim 32 \pm 10$ km/s, median $V_c/\sigma_0 \sim 8.6 \pm 2.9$), consistent with dynamically turbulent disks at late cosmic noon. After modeling the axisymmetric rotation with the forward-modeling code DysmalPy, we reveal spatially coherent velocity residuals in all but one more inclined system. The inferred in-plane non circular motions reach amplitudes of $\sim 50$-100 km/s, significantly larger than typically observed in local disk galaxies. Interpreting these non-circular motions as radial flows we find that the velocity residuals spatially coincide with non-axisymmetric structures -- spiral arms and bars -- demonstrating a direct link between galaxy morphology and gas transport at $z \sim 1$-2. In spiral galaxies, the residual velocity patterns are typically dominated by inflows, while barred systems display an apparent inflow-outflow pattern, characteristic of in-plane bar-driven gas motions. We further find that the inferred molecular gas inflow rates are substantial, with a typical net inflow rate of the order of the star formation rate ($\dot M \sim -50 M_\odot$/yr). This implies that spiral arms and bars at cosmic noon are highly efficient at funneling cold gas toward galaxy centers, perhaps driving the buildup of bulges and feeding central star forming regions and supermassive black holes.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper reports deep NOEMA CO(2-1) observations of 10 massive main-sequence galaxies at z~1.1-1.6, combined with JWST imaging. Forward modeling with DysmalPy decomposes the molecular gas kinematics into axisymmetric rotation plus turbulence (median Vc/σ0 ~8.6), revealing coherent velocity residuals of 50-100 km/s in 9/10 systems. These residuals are interpreted as in-plane radial flows that align spatially with spiral arms and bars, yielding net molecular inflow rates ~50 M⊙ yr⁻¹ comparable to the SFR and implying efficient morphology-driven gas transport at cosmic noon.
Significance. If the residuals are shown to be radial inflows, the work supplies rare kpc-scale constraints on cold-gas dynamics at the end of cosmic noon and links non-axisymmetric structures to central gas delivery. The depth of the NOEMA data, the use of forward modeling, and the joint kinematic-morphological analysis are clear strengths that would advance models of bulge growth and AGN fueling if the interpretation holds.
major comments (3)
- [§4] §4 (Kinematic modeling): The DysmalPy fits adopt a thin-disk geometry containing only circular rotation and isotropic turbulence. No alternative models that include warps, vertical motions, or residual beam-smearing are presented to test whether they can reproduce the observed 50-100 km/s coherent residuals. The single inclined galaxy that lacks residuals already suggests possible projection or geometric dependence that should be quantified.
- [§5.1] §5.1 (Non-circular motions): The statement that velocity residuals 'spatially coincide with non-axisymmetric structures—spiral arms and bars—demonstrating a direct link' rests on visual comparison. No quantitative measure of spatial overlap, correlation, or statistical significance is reported, weakening the causal claim between morphology and gas transport.
- [§5.2] §5.2 (Inflow rates): The conversion of residual velocities into net inflow rates (Ṁ ~ -50 M⊙ yr⁻¹) assumes a specific deprojection, gas surface-density distribution, and radial integration range. The manuscript does not detail how these quantities are derived, how beam-smearing affects the residuals, or how uncertainties are propagated, making it difficult to assess whether the rates are robustly comparable to the SFR.
minor comments (2)
- [Figures 3-4] Figure 3 and 4: Overplotting JWST morphological contours on the residual velocity maps would make the claimed spatial alignment more transparent to the reader.
- [Table 2] Table 2: The reported median values for Vc/σ0 and σ0 should include the full sample statistics and any inclination-dependent trends to allow direct comparison with the text.
Simulated Author's Rebuttal
We thank the referee for their constructive and positive report on our manuscript. Their comments have identified areas where we can strengthen the presentation and robustness of our analysis. We address each major comment point-by-point below and have revised the manuscript accordingly.
read point-by-point responses
-
Referee: [§4] §4 (Kinematic modeling): The DysmalPy fits adopt a thin-disk geometry containing only circular rotation and isotropic turbulence. No alternative models that include warps, vertical motions, or residual beam-smearing are presented to test whether they can reproduce the observed 50-100 km/s coherent residuals. The single inclined galaxy that lacks residuals already suggests possible projection or geometric dependence that should be quantified.
Authors: We thank the referee for this important suggestion. The thin-disk model with isotropic turbulence is well-motivated by the observed high Vc/σ0 ratios (median ~8.6), which indicate dynamically cold disks, and DysmalPy explicitly forward-models beam-smearing. Nevertheless, we agree that explicit tests of alternatives would increase confidence in the residuals. In the revised manuscript we will add a new subsection in §4 presenting results from models that include mild warps and vertical motions; these show that such geometries do not reproduce the observed coherent 50-100 km/s residuals as effectively as the in-plane radial-flow interpretation. For the single more inclined galaxy lacking residuals, we interpret this as a projection effect (in-plane flows become harder to detect at higher inclinations) and will quantify this expectation using mock observations in the revision. revision: yes
-
Referee: [§5.1] §5.1 (Non-circular motions): The statement that velocity residuals 'spatially coincide with non-axisymmetric structures—spiral arms and bars—demonstrating a direct link' rests on visual comparison. No quantitative measure of spatial overlap, correlation, or statistical significance is reported, weakening the causal claim between morphology and gas transport.
Authors: We acknowledge that the current link relies on visual alignment. To address this, the revised manuscript will include a quantitative analysis of the spatial correspondence between the velocity-residual maps and the non-axisymmetric morphological features extracted from the JWST imaging. We will compute overlap fractions and Pearson correlation coefficients between the residual velocity fields and masks of spiral arms and bars, together with statistical significance assessed via Monte-Carlo randomization of the residual maps. revision: yes
-
Referee: [§5.2] §5.2 (Inflow rates): The conversion of residual velocities into net inflow rates (Ṁ ~ -50 M⊙ yr⁻¹) assumes a specific deprojection, gas surface-density distribution, and radial integration range. The manuscript does not detail how these quantities are derived, how beam-smearing affects the residuals, or how uncertainties are propagated, making it difficult to assess whether the rates are robustly comparable to the SFR.
Authors: We agree that additional methodological detail is needed. In the revised §5.2 we will expand the description of the inflow-rate calculation to include: (i) the exact deprojection formula applied to the residual velocities, (ii) the adopted molecular-gas surface-density profiles derived from the NOEMA CO maps, (iii) the radial integration limits used, and (iv) the full uncertainty budget that propagates errors from velocity residuals, density, inclination, and distance. We will also explicitly discuss the residual impact of beam-smearing (already mitigated by the DysmalPy forward modeling) and present sensitivity tests varying the integration range and density assumptions. revision: yes
Circularity Check
Minor self-citation in modeling tool but derivation self-contained from new observations
full rationale
The paper applies DysmalPy to fit axisymmetric rotation to new high-resolution NOEMA CO data, then interprets residuals as radial flows via spatial coincidence with JWST morphology and computes inflow rates as an inference step. No step reduces by construction to its inputs, no fitted parameter is relabeled as prediction, and no load-bearing uniqueness theorem or ansatz is imported solely via self-citation. The central morphology-transport link and ~50 M⊙/yr inflow claim rest on independent data and standard decomposition rather than definitional equivalence, consistent with a low circularity score.
Axiom & Free-Parameter Ledger
free parameters (1)
- DysmalPy model parameters (inclination, position angle, turbulence)
axioms (1)
- domain assumption The molecular gas distribution can be described by an axisymmetric rotating disk with moderate intrinsic turbulence that DysmalPy can forward-model accurately.
Forward citations
Cited by 2 Pith papers
-
Peering down the barrel with DESI DR2: 10 000+ inflows at $z$ < 0.6 reveal how galaxies accrete cold gas
A large DESI sample reveals thousands of infalling cold gas absorbers at low redshift, with velocity distributions indicating multiple accretion pathways including radial inflows and satellite accretion.
-
NOEMA3D: Spatially resolved dust, CO, and [C I] in massive star-forming main sequence galaxies at cosmic noon
Spatially resolved NOEMA observations reveal extended molecular gas disks in main-sequence galaxies at z=1.1-1.6, supporting steady accretion via spirals or bars instead of merger-driven starbursts.
Reference graph
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discussion (0)
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