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Big, Dusty Galaxies in Blue Jay: Insights into the Relationship Between Morphology and Dust Attenuation at Cosmic Noon

T0 review · 4 major / 6 minor · reviewed 2026-08-16 · deepseek-v4-flash

Pith's one-line read Massive dusty galaxies at cosmic noon appear about 30 percent larger in rest-optical than rest-NIR light because central dust flattens their optical light profiles.

desk verdict A careful JWST study that makes a plausible case for dust-driven rest-optical size inflation at cosmic noon, but the load-bearing Av correlation in Fig. 11 lacks redshift control and is partly model-built. read the letter →

arxiv 2504.15346 v1 pith:C3QS3KCS submitted 2025-04-21 astro-ph.GA

classification astro-ph.GA
keywords dustattenuationgalaxymorphologycosmicnoonsize-massrelationJWSTSEDfittingBalmerdecrementrest-frameoptical/NIRsizes
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper argues that dust does more than dim galaxies: it changes how their sizes appear, and it must be included when measuring morphology at cosmic noon. Using 141 galaxies at redshifts 1.7–3.5 with JWST spectra and deep imaging, the authors find that the effective dust attenuation law varies widely with stellar mass, star formation rate, and optical extinction. The sharpest result is that massive galaxies (about $10^{10}$ solar masses and above) look roughly 30 percent larger in rest-optical light than in rest-near-infrared light, because dust concentrated in their centres flattens the optical light profile. If correct, single-band size measurements overestimate the true stellar sizes of massive dusty galaxies, and size-mass relations at cosmic noon need dust-aware corrections.

What carries the argument

The load-bearing machinery is the two-component dust attenuation model combined with flexible attenuation laws and multi-band morphological fitting. A power-law 'birth cloud' component with fixed slope $n_1=-1$ attenuates light from stars younger than 10 Myr and from nebular regions, while an ISM component with a free slope $n_2$ and a 2175 Å UV bump whose strength is tied to $n_2$ attenuates all stars, built on a flexible curve anchored to the local starburst law. The effective attenuation law for each galaxy is recovered by comparing dust-on and dust-free model spectra from the SED fit, so stellar-population, dust, and morphological effects can be separated. Half-light radii come from one-component Sérsic profile fits to NIRCam images in F150W, F356W, and F444W; the flattening of the rest-optical light profile by the fitted central attenuation is what produces the ~30 percent size excess.

What would settle it

Dust-correct the rest-optical images for the most massive galaxies (for example by dividing the F150W image by the fitted attenuation map, or by using a Balmer-decrement-based attenuation map) and re-measure half-light radii; if the ~30 percent optical-versus-NIR size excess is caused by central dust, the corrected optical/NIR size ratio should become consistent with unity.

Watch

Extended reading notes

Core claim

The central discovery is a wavelength-dependent size gradient produced by dust. For the most massive star-forming galaxies in the sample ($M_\star \gtrsim 10^{10}\,M_\odot$), the half-light radius measured in F150W—which probes rest-optical light—is on average about 30 percent larger than the half-light radius measured in F444W, which probes rest-NIR light. The excess grows with the fitted optical attenuation $A_V$, and the authors interpret it as central dust attenuating the inner regions more strongly, flattening the optical surface-brightness profile and pushing the effective radius outward. Lower-mass galaxies show a wide range of optical-to-NIR size ratios, which the authors attribute to either inside-out growth or central starbursts rather than dust. The paper also establishes that the shape and strength of the attenuation law vary systematically with stellar mass, SFR, and $A_V$; that $A_V$ correlates more tightly with stellar-mass and SFR surface densities than with global quantities; and that nebular attenuation from the Balmer decrement tracks stellar-continuum attenuation among 67 star-forming galaxies.

Load-bearing premise

The load-bearing premise is that the adopted dust model—a fixed birth-cloud slope and a UV-bump strength tied to the ISM slope—describes real attenuation laws, since a different but plausible geometry would change the fitted optical attenuation and with it the size-gradient conclusion.

Editorial extensions

If this is right

  • Size-mass relations in the rest-optical and rest-NIR differ: the rest-optical relation has a positive slope at $1.7<z<3$ that flattens at the massive end, while the rest-NIR relation is nearly flat across $1.7<z<3.5$.
  • Dust attenuation correlates more strongly with stellar-mass and SFR surface densities than with the global stellar mass and SFR, implying that the concentration of mass and star formation sets the dust column.
  • The 2175 Å UV-bump strength in the effective attenuation law is weaker than Milky Way/LMC values and cannot lie above the relation built into the model, because birth-cloud dust with no bump dilutes it; this is a modelling consequence, not a direct grain-composition measurement.
  • Nebular attenuation measured from the Balmer decrement correlates with stellar-continuum $A_V$ (Spearman rank $r\simeq0.66$), supporting a common dust geometry for stars and gas in highly star-forming systems.
  • No significant correlation is found between $A_V$ and axis ratio at $1.7<z<3.5$, consistent with clumpy star-dust geometry rather than inclination-driven attenuation at cosmic noon.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the size gradient is really produced by central dust, single-band rest-optical sizes systematically overestimate the effective radii of massive dusty galaxies; evolutionary size-mass relations built from such bands would then need dust corrections before being read as structural growth.
  • Because the fitted attenuation law enforces a fixed birth-cloud slope and a tied bump-slope relation, part of the reported correlation between attenuation-law shape and star formation rate is imposed by the model; a testable next step is to fit steeper or decoupled dust laws and see whether the ~30% size excess survives.
  • Spatially resolved dust maps (for example Balmer-decrement gradients) for a subset of these galaxies could directly confirm the central dust gradient: if it is real, the dust-corrected optical light profile should recover the flatter, more extended shape that the attenuation model predicts.
  • The wide optical-to-NIR size ratios of lower-mass galaxies, interpreted as inside-out growth or central starbursts, could be separated by measuring rest-UV/optical colour gradients; this would distinguish dust-free structural differences from the dust-driven signal seen at high mass.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 6 minor

Summary. This paper presents a study of 141 Blue Jay galaxies at 1.7<z<3.5, combining JWST/NIRSpec R~1000 spectroscopy, NIRCam photometry, and HST photometry. Stellar populations and dust attenuation are modeled with Prospector using non-parametric SFHs and a two-component dust model: a birth-cloud power-law with fixed slope n1=-1 (Eq. 1) and an ISM attenuation law with a UV-bump strength tied to the ISM slope via Eb=0.85-1.9n2 (Eq. 4). The authors derive effective attenuation laws, report correlations between attenuation parameters and stellar mass, SFR, and surface densities, and compare stellar-continuum attenuation with Balmer-decrement nebular attenuation. Morphological fits with Pysersic in F150W, F356W, and F444W yield size-mass relations and a wavelength-dependent size ratio RF150W/RF444W; the central claim is that massive galaxies (M* >~1e10 Msun) appear about 30% larger in the rest-optical than in the rest-NIR because central dust flattens the optical light profile (Section 6.4, Figure 11).

Significance. If the size-gradient result holds, it is a valuable JWST-era measurement linking dust geometry to observed morphology at cosmic noon. The paper has real strengths: the size ratios are directly measured on 87-93 galaxies, the comparison with Balmer-decrement attenuation provides an independent dust tracer, and the authors are unusually candid about which trends are imposed by the model rather than required by the data (Section 5). The attenuation-law diversity and the mass-dust relation are interesting and well-contextualized with the literature. However, the headline causal claim that dust drives the 30% size excess is not yet backed by a controlled statistical analysis, and several quantitative statements rest on correlation coefficients reported without uncertainties.

major comments (4)
  1. [Section 6.4, Figure 11] The central size-gradient claim is not supported by a controlled statistical analysis. Figure 11 pools galaxies over the full range 1.7<z<3.5, while the rest-frame coverage of F150W and F444W shifts by a factor of about 1.7 across this range: F150W probes ~0.55 micron at z=1.7 but ~0.33 micron at z=3.5, and F444W probes ~1.6 micron at z=1.7 but ~1.0 micron at z=3.5. Because dust attenuation is stronger at bluer rest-frame wavelengths, and because stellar population gradients across the Balmer/4000 A break can also produce wavelength-dependent sizes, a trend of RF150W/RF444W with Av could arise partly from redshift-dependent wavelength sampling even with no change in central dust geometry. The paper reports no Spearman coefficient, fit, or significance for Figure 11, and the '~30%' statement is based on a visual trend. Please add redshift-binned versions of Figure 11 or a partial-correlation analysis controlling for redshift, quote correlation statistics with bootstrap uncertainties, check whether the massive high-Av galaxies preferentially lie at high z, and, if possible, use the Balmer-decrement attenuation as an independent dust indicator for the 67 galaxies with reliable measurements.
  2. [Section 5, Eqs. (1) and (4)] The paper explicitly states in Section 5 that the trends of attenuation-law slope and UV-bump strength with SFR are 'by construction': the birth-cloud slope is fixed at n1=-1, and the ISM bump strength is tied to the ISM slope by Eb=0.85-1.9n2. Nevertheless, the abstract and conclusions (item i) present these as empirical findings of diversity in the attenuation law. As written, this portion of the headline result is a property of the fitting assumptions rather than an independent measurement. Please state this model-imposed nature in the abstract and conclusions, and perform a robustness check, for example leaving n1 free in a subset of galaxies or fitting the bump strength independently, to show whether the data actually require the reported variation. This matters for the derived Av values that are used in the size-gradient interpretation.
  3. [Section 6.4] The causal attribution of the size ratio trend to central dust is not unique. Stellar population gradients (old centres with young outskirts) produce the same sign of wavelength-dependent size ratio without any dust, and the paper invokes exactly this mechanism for low-mass galaxies in the same section. Since high-Av massive galaxies likely have different SFHs from low-Av systems, the observed correlation could be partly due to stellar population gradients that correlate with Av. A quantitative test would be to compare rest-optical and rest-NIR Sersic indices or to use spatially resolved SED information to separate dust from stellar population effects; at minimum, the discussion should quantify how much of the 30% effect could be explained by stellar population gradients alone.
  4. [Sections 5, 6.1, and 7] Many Spearman rank coefficients are quoted without uncertainties (e.g., r=0.532 and r=0.667 in Figure 6; the r values in Figures 7, 12, and 13), and claims such as 'the surface densities correlate more strongly than the global quantities' are based on comparing coefficients from 16-36 galaxies per bin without error bars. Please provide bootstrap or posterior uncertainties for all quoted correlation coefficients and temper comparative statements unless the difference is statistically significant. This is partly a presentation issue, but it affects the quantitative conclusions about which galaxy properties best predict dust attenuation.
minor comments (6)
  1. [Section 3.2] In the description of the Drude profile, 'Delta lambda is is the FWHM' contains a duplicated 'is'.
  2. [Figure 1 caption] The caption appears to print 'n1 = 1' and 'n2 = 0.7' without the minus signs that the text and the panel labels use (n1=-1, n2=-0.7). Please correct the caption typography.
  3. [Abstract] The phrase 'star dust geometry' should be 'star-dust geometry' for consistency with the main text.
  4. [Section 7] The word 'anomolous' is a typo for 'anomalous'.
  5. [Figure 3] The SFR-bin labels in Figure 3 are garbled in the text version (e.g., '10 2.3<SFR [yr 1]<100.6'); please ensure the rendered labels display the intended powers of ten.
  6. [Sections 2 and 3.5] The sample-flow numbers (141 total, 137 with attenuation laws, 104/98 with morphological fits, 93/87 star-forming with morphology, 67 with Balmer decrements) are scattered across the text; a single sample-selection table or flowchart would make the analysis much easier to follow.

Circularity Check

2 steps flagged · score 6.0 of 10

Slope/bump vs SFR trends are model-imposed by construction; the size-gradient and Balmer-decrement results remain independent observational correlations.

  1. self definitional [Section 5, Figure 6 and accompanying text; Eqs. (1), (4), (5)]
    "This relationship is by construction, since the birth cloud dust is modelled to have a fixed, shallow slope. When the birth cloud dust contributes significantly to the attenuation law (namely in highly star-forming galaxies), the overall attenuation law will have a shallow slope."

    The effective attenuation law is defined by Eq. (5) as a luminosity-weighted sum of a birth-cloud law with fixed slope n1=-1 (Eq. 1) and an ISM law whose bump strength is locked to its slope by Eb=0.85-1.9n2 (Eq. 4). High-SFR galaxies have a large young-star flux fraction f_L(<10 Myr), so the algebra forces the combined law toward the fixed shallow, bump-free birth-cloud component. Hence the paper's 'finding' that high-SFR galaxies have shallower UV-optical slopes is a restatement of the model construction, not an independent empirical discovery. The paper is transparent about this, but the abstract and conclusions still present the SFR dependence of attenuation-law shape as a principal result.

  2. self definitional [Section 4.3, Figure 5 discussion; Eqs. (4) and (5)]
    "Therefore, by construction, no galaxy can lie above the purple curve since the ISM dust would put it exactly on the purple curve, and the birth cloud dust will pull it down further to weaker bump strengths. Because of this, our dust attenuation laws are typically unable to reach bump strengths as strong as the MW or the LMC."

    The observed weakness of the 2175 Å bump is a necessary consequence of the adopted parameterization: the ISM component is constrained to lie on the Kriek & Conroy (2013) bump-slope relation by Eq. (4), and the birth-cloud component is modelled with no bump at all. Therefore the distribution of measured bump strengths below the purple curve, and the statement that strong Milky-Way-like bumps are unattainable, follow from the model's definitions rather than from the data being able to explore alternative attenuation laws. This is an openly acknowledged model limitation, but it is still listed as an empirical property of the sample's attenuation laws.

full rationale

The paper is unusually explicit about two places where its headline attenuation-law trends are dictated by the model rather than measured independently. In Section 5 it states that the SFR-vs-slope relation is 'by construction' because the birth-cloud slope is fixed to n1=-1, and in Section 4.3 it states that no galaxy can lie above the Kriek & Conroy (2013) bump-slope relation 'by construction' because Eb is tied to n2 and the birth cloud has no bump. These are genuine self-definitional constraints: Eq. (5) combines a fixed-shape birth-cloud law with an ISM law whose bump is locked to its slope, so the SFR trends and the weak-bump distribution are algebraic consequences of the adopted dust model. The abstract and conclusions nevertheless present the SFR dependence of attenuation-law shape as a finding, so part of the central attenuation-law claim reduces by construction. The size-gradient result in Section 6.4 is not circular: the ratio R_F150W/R_F444W comes from imaging, Av comes from SED fitting, and no equation ties the two together; it is an empirical correlation, although the reviewer's redshift-wavelength concern is a legitimate confound for the causal attribution. The Balmer-decrement comparison provides an independent nebular check because the emission lines were marginalized during SED fitting, and the size-mass relations are compared with external literature. Self-citations (Park et al. 2024, Bugiani et al. 2024) are data provenance rather than load-bearing circular arguments. Overall, the partial circularity lies in the model-imposed attenuation-law-shape correlations, while the independent size-gradient core prevents a higher score.

Assumptions & free parameters 3 free parameters · 6 assumptions · 0 invented entities

The central claims rest on the adopted dust model family and SED fitting choices. The paper is explicit about the by-construction nature of several attenuation-law trends, but readers cannot recover the galaxy parameters without the Blue Jay data and Prospector configuration.

free parameters (3)
  • Birth cloud attenuation law slope n1 = -1 (fixed by hand)
    Fixed in Section 3.2; sets the birth cloud dust law to a shallow power law, which forces the overall attenuation law to flatten as the young-star fraction rises.
  • ISM UV-bump slope coupling coefficients (0.85, -1.9) = 0.85 and -1.9 (fixed from Kriek & Conroy 2013)
    Equation 4 ties the 2175 Angstrom bump strength to the ISM slope n2, limiting the measured bump strength and coupling slope and bump by construction.
  • Per-galaxy dust parameters tau_1, tau_2, n2 = Per-galaxy posteriors (not tabulated in paper)
    These are fit to each galaxy's SED in Prospector; the paper's attenuation laws and Av values are derived from them, so the correlations with mass and SFR are partly correlations between fitted parameters.
assumptions (6)
  • domain assumption Two-component Charlot & Fall (2000) dust geometry: birth clouds attenuate stars younger than 10 Myr and nebular emission; diffuse ISM attenuates all stars.
    Adopted in Section 3.2, Eq. 5; the effective attenuation law and its variations are defined through this split.
  • domain assumption Noll et al. (2009) parameterization of the ISM attenuation law, including the fixed Drude profile for the 2175 Angstrom bump and the Eb-n2 coupling (Eqs. 2-4).
    This shape family restricts the attenuation laws the fit can produce, and the paper's bump-strength analysis is bounded by it.
  • domain assumption Dust absorption and re-emission are in energy balance in Prospector.
    Section 3.1; this couples the dust attenuation to infrared re-emission, which is not observed here.
  • domain assumption Case B recombination with T = 10^4 K and ne = 10^2 cm^-3 gives the intrinsic Balmer decrement of 2.86.
    Section 3.3; used to interpret H-alpha/H-beta as nebular attenuation.
  • domain assumption A single Sersic profile describes the surface brightness of galaxies retained in the morphological sample.
    Section 3.4; complex, merging, AGN, and low-S/N systems are visually discarded, so the size measurements assume the one-component model applies to the kept galaxies.
  • domain assumption Stellar population synthesis models (FSPS, MIST, C3K) and the Chabrier IMF describe the stellar emission.
    Section 3.1; all stellar mass and SFR estimates inherit these model assumptions.

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Pith. "Pith review of Big, Dusty Galaxies in Blue Jay: Insights into the Relationship Between Morphology and Dust Attenuation at Cosmic Noon." pith.science (2026). https://pith.science/paper/C3QS3KCS

@misc{pith2026250415346,
  author       = {Pith},
  title        = {Pith review of: Big, Dusty Galaxies in Blue Jay: Insights into the Relationship Between Morphology and Dust Attenuation at Cosmic Noon},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/C3QS3KCS}},
  note         = {Machine review of arXiv:2504.15346}
}
abstract

The dust attenuation of galaxies is highly diverse and closely linked to stellar population properties and the star dust geometry, yet its relationship to galaxy morphology remains poorly understood. We present a study of 141 galaxies ($9<\log(\rm M_{\star}/\rm M_{\odot})<11.5$) at $1.7<z<3.5$ from the Blue Jay survey combining deep JWST/NIRCam imaging and $R\sim1000$ JWST/NIRSpec spectra. Using \texttt{Prospector} to perform a joint analysis of these data with non-parametric star-formation histories and a two-component dust model with flexible attenuation laws, we constrain stellar and nebular properties. We find that the shape and strength of the attenuation law vary systematically with optical dust attenuation ($A_V$), stellar mass, and star formation rate (SFR). $A_V$ correlates strongly with stellar mass for starbursts, star-forming galaxies and quiescent galaxies. The inclusion of morphological information tightens these correlations: attenuation correlates more strongly with stellar mass and SFR surface densities than with the global quantities. The Balmer decrement-derived nebular attenuation for 67 of these galaxies shows consistent trends with the stellar continuum attenuation. We detect a wavelength-dependent size gradient: massive galaxies ($\rm M_{\star}\gtrsim 10^{10}~M_{\odot}$) appear $\sim30\%$ larger in the rest-optical than in the rest-NIR, driven by central dust attenuation that flattens optical light profiles. Lower-mass systems exhibit more diverse size ratios, consistent with either inside-out growth or central starbursts. These results demonstrate that dust attenuation significantly alters observed galaxy structure and highlight the necessity of flexible attenuation models for accurate physical and morphological inference at cosmic noon.

Figures

Figures reproduced from arXiv: 2504.15346 by the authors.

Figure 1
Figure 1. The effective attenuation law of a toy model galaxy varying (left to right) the birth cloud optical depth, 𝜏1; the ISM optical depth, 𝜏2; the ISM dust attenuation law slope, 𝑛2, and the mass fraction of young stars (< 10 Myr), 𝑓10. As one parameter varies, all other parameters remain fixed to the fiducial values. In the first panel, as 𝜏1 increases, the slope of the overall attenuation law decreases towards the slop… view at source ↗
Figure 2
Figure 2. The observed and best-fit spectra and photometry for the galaxy with ID= 11142. The observed spectrum is fit over the range 4000 < 𝜆rest < 6700 Å and the residual of this fit is shown in the inset figure. The observed and model photometry are in good agreement. The dust-free spectrum is shown in blue, and the attenuation law for this galaxy is shown in green. an Affine Invariant Markov Chain Monte Carlo (MCMC) ensem… view at source ↗
Figure 3
Figure 3. The attenuation law, normalised by 𝐴V, for our sample of galaxies in bins of 𝐴V, stellar mass (M★) and star formation rate (SFR), from left to right. Dispersion of the attenuation laws is shown as the shaded regions. The attenuation law of local starbursts (Calzetti et al. 2000) and the Milky Way extinction law (Cardelli et al. 1989) are plotted as the black dashed-dot and green dashed lines, respectively. Large var… view at source ↗
Figures from the paper (9 more)
Figure 5
Figure 5. Figure 5: The 2175 Å UV-bump strength plotted against the UV-optical slope (𝐴UV/𝐴V) of the dust attenuation laws for our galaxies, colour-coded by the sSFR. The values of the slope and bump strength for the MW (Cardelli et al. 1989), LMC and SMC (Gordon et al. 2003) and Calzetti…
Figure 6
Figure 6. Figure 6: The dust attenuation law parameters plotted against the stellar mass (M★) and star formation rate (SFR), all colour-coded by the sSFR. The Spearman rank coefficient 𝑟 is given in each panel, quantifying the strength of the correlation between the X and Y parameters. In…
Figure 7
Figure 7. Figure 7: The optical dust attenuation, 𝐴V, plotted against the surface density of stellar mass, ΣM★ in the top panel, and the surface density of SFR, ΣSFR in the bottome panel, in bins of redshift, colour coded by the sSFR. The sizes are measured in the F356W filter. The Spearm…
Figure 8
Figure 8. Figure 8: The optical dust attenuation, 𝐴V, plotted against the axis ratios measured in the F356W filter, b/aF356W, in bins of redshift, colour-coded by the stellar mass. There is negligible correlation between 𝐴V and the axis ratio except in the highest redshift bin, which is l…
Figure 9
Figure 9. Figure 9: Size-mass relations for our sample of galaxies in the F150W and F444W filters, colour-coded by the sSFR. The F150W filter covers the rest￾frame optical, and the F444W filter covers the rest-frame NIR. Overplotted is the linear best fit of the size-mass relation as the …
Figure 10
Figure 10. Figure 10: Size-mass relations for our sample of galaxies measured in the rest-optical with the F150W filter (top panel) and measured in the rest-NIR with the F444W filter (bottom panel), in bins of redshift, colour coded by 𝐴V. The linear best fit is plotted in purple in each p…
Figure 11
Figure 11. Figure 11: Ratio of the effective radius measured in the F150W filter (RF150W) to that measured in the F444W filter (RF444W), plotted against the stellar mass, colour-coded by 𝐴V. The F150W filter measures the rest-frame optical here, and the F444W the rest-frame NIR, so RF150W/…
Figure 12
Figure 12. Figure 12: The Balmer decrement (H𝛼/H𝛽), tracing the nebular attenuation, is plotted against the stellar mass (M★) and SFR in the top panel, colour-coded by the sSFR. The optical dust attenuation 𝐴V, probing the attenuation of the stellar continuum from SED fitting, is plotted a…
Figure 13
Figure 13. Figure 13: The Balmer decrement (H𝛼/H𝛽), measuring the nebular dust attenuation, plotted against the optical dust attenuation (AV) from SED fitting, measuring the attenuation of the stellar continuum, colour coded by the sSFR. The Spearman rank coefficient is written on the figu…

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Forward citations

Cited by 2 Pith papers

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  1. The Thesan-Zoom project: bursty star formation is incompatible with prolonged dust survival

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    In Thesan-Zoom, bursty star formation prevents prolonged survival of large dust reservoirs (M_dust/M_star ≳ 10^{-3}), so it can explain z≳10 UV-bright galaxies only if it settles by z∼8.

  2. Even redder than we knew: color and $A_{\mathrm{V}}$ evolution up to $z=2.5$ from JWST/NIRCam photometry

    astro-ph.GA 2025-06 conditional novelty 6.0 of 10

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Reference graph

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Pith tools

Reviewed August 16, 2026 · model on record in the stance chip above.