REVIEW 3 major objections 5 minor 109 references
Why do some Ultra Diffuse Galaxies have Rich Globular Cluster Systems?
T0 review · 3 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash
Pith's one-line read Cluster-rich ultra diffuse galaxies are best explained as failed galaxies whose globular clusters formed with extremely high efficiency — at least 40–80 percent of field-star formation — followed by modest cluster destruction, a…
desk verdict A clean two-parameter model for GC-rich UDGs, but the adopted destruction fraction is likely too high for UDGs, so the claim of very high formation efficiency is not yet supported. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing object is a two-parameter identity, equation 6: $M_{\rm GC}/M_* = (1-d)/(1/c+d)$, derived from the assumptions that the galaxy quenches early, that the only field-star growth is through disrupted globular clusters, and that the initial cluster mass is $c$ times the initial field-star mass. A companion expression, equation 7, gives the fraction of the final stellar mass that came from disrupted clusters, $d/(1/c+d)$, and this is what the paper uses to weight the expected stellar-population shift from dwarf-like to globular-cluster-like as the cluster-mass fraction increases. The machinery's work is to turn the observed spread in $M_{\rm GC}/M_*$ — from about 0 percent for puffy-dwarf UDGs to about 10 percent for failed-galaxy candidates — into a constraint on the combination of formation and destruction that produced it.
What would settle it
Measure the integrated stellar metallicity of a robust, spectroscopically confirmed UDG with $M_{\rm GC}/M_*$ near 10 percent: the model predicts field stars there must be strongly metal-poor and GC-like because disrupted clusters dominate the field by equation 7, so finding such a galaxy with normal dwarf-like metallicity for its stellar mass would falsify the claim that high cluster efficiency drives these systems.
Extended reading notes
Core claim
The central claim is that the extreme globular-cluster richness of some UDGs is set at formation, not by survival. From equation 6, the present-day ratio $M_{\rm GC}/M_* = (1-d)/(1/c+d)$, where $c$ is the initial ratio of globular-cluster mass to field-star mass and $d$ is the fraction of globular-cluster mass destroyed through mass loss and tidal disruption. Reaching $M_{\rm GC}/M_* \sim 10\%$ today requires $c \ge 0.4$ if $d = 0.7$, $c \ge 0.8$ if $d = 0.8$, and $c > 1$ if $d = 0.9$. Since destruction fractions of 0.9 would demand impossibly high formation efficiencies, the authors conclude that cluster-rich UDGs most plausibly formed with very high GC formation efficiencies — consistent with JWST detections of high-redshift lensed galaxies in which bound clusters hold 30–70 percent of the stellar mass — and with only modest subsequent destruction. The model also predicts, and the current data loosely show, that as $M_{\rm GC}/M_*$ rises the stellar populations of UDGs become more metal-poor and slightly older, approaching the properties of old metal-poor globular clusters.
Load-bearing premise
The model's conclusions rest on assuming that ultra diffuse galaxies destroy 70–90 percent of their globular clusters, a destruction fraction taken from simulations of ordinary dwarf galaxies, even though the cluster-rich UDGs are thought to have unusually heavy dark matter halos compared with their stellar mass.
Editorial extensions
If this is right
- Cluster-rich UDGs with $M_{\rm GC}/M_* \sim 10\%$ are most likely failed galaxies: they formed in massive halos, produced globular clusters with very high efficiency, and quenched before forming most of their field stars.
- The field stars of the most cluster-rich UDGs should resemble old, metal-poor, alpha-enhanced globular-cluster populations; NGC5846_UDG1, with $M_{\rm GC}/M_* = 9.8\%$, matches this prediction.
- The model predicts a continuous trend of decreasing metallicity and slightly increasing age with rising $M_{\rm GC}/M_*$, rather than a sharp division between puffy dwarfs and failed galaxies; current data loosely follow this trend.
- High-redshift lensed galaxies seen by JWST, with 30–70 percent of their stellar mass in bound clusters, may be the formation phase of today's cluster-rich UDGs.
- If $d = 0.9$, no plausible $c$ can reproduce the observed 10 percent upper limit, so the data favor destruction fractions near 0.7–0.8 rather than higher ones.
Reading between the lines
- A sharper test of the $c$–$d$ degeneracy would be to measure the fraction of GC-like stars in UDG fields: equation 7 shows that at fixed $M_{\rm GC}/M_*$, a higher disrupted-cluster fraction means a more metal-poor, older field, so abundance patterns could break the degeneracy that a single ratio leaves open.
- If future simulations tailored to low-surface-density, cored-halo UDGs yield destruction fractions below 0.7, the required formation efficiency drops, and cluster-rich UDGs could be ordinary dwarfs with unusually high cluster formation rather than fundamentally failed galaxies; the paper's conclusion would then weaken but its framework would still hold.
- The model implies that the 'failed galaxy' label is better viewed as a continuum index — the fraction of stars contributed by disrupted globular clusters — rather than a binary classification; this index is measurable from integrated stellar abundances.
- Because the JWST cluster-mass fractions are lower limits (fainter clusters are undetected), deeper imaging of the same lensed galaxies could push $c$ toward or above 1, which would make the failed-galaxy scenario even more extreme and would predict that field stars in these galaxies should be almost entirely GC-like.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper addresses the origin of ultra diffuse galaxies (UDGs) with unusually massive globular cluster (GC) systems. It constructs a simple two-parameter model in which the present-day GC-to-stellar mass ratio, M_GC/M_*, depends on an initial GC formation efficiency c and a destruction fraction d (Eq. 6). The model assumes early quenching and that disrupted GCs contribute their stars to the host galaxy. Using GC destruction fractions d = 0.7–0.9 from the Moreno-Hilario et al. (2024) simulations and formation efficiencies suggested by recent JWST observations of lensed galaxies, the authors conclude that UDGs with M_GC/M_* ≈ 10% require very high formation efficiencies (≥40%) combined with modest destruction. They further compare stellar population properties ([M/H], age, [Mg/Fe]) of a small UDG sample with model tracks and report a loose trend toward more GC-like populations with increasing M_GC/M_*.
Significance. If the central inference holds, the paper offers a compact, physically motivated framework for connecting GC richness to the integrated stellar populations of UDGs, and it usefully highlights the role of GC destruction in shaping present-day ratios. The model is transparent and falsifiable, and the authors are commendably explicit about the limitations of their sample and assumptions. The use of JWST lensed-galaxy cluster mass fractions as empirical anchors for c is a strength. However, the quantitative conclusion is currently weakly constrained because it hinges on a destruction fraction that is borrowed from classical dwarf simulations, and the empirical comparison is affected by small sample size, selection biases, and a model zero point defined from the same data. These issues leave the main claim defensible but not yet firmly established.
major comments (3)
- [Section 5, Eq. (6)] The adopted destruction fraction d = 0.7–0.9 is load-bearing for the paper's main quantitative claim, yet it is taken directly from Moreno-Hilario et al. (2024), whose simulated galaxies follow the standard stellar mass–halo mass relation by the authors' own admission. Section 4 states that this same simulation finds lower disruption rates in lower-mass, lower-density galaxies, which is used to explain why UDGs have high M_GC/M_* today. Applying the classical dwarf range d = 0.7–0.9 to UDGs is therefore inconsistent with the cited trend. The sensitivity of Eq. (6) is large: for M_GC/M_* = 10%, d = 0.7 requires c ≈ 0.43, d = 0.5 requires c ≈ 0.22, and d = 0.3 requires c ≈ 0.15. If the true UDG destruction fraction is lower, the claim that 'very high GC formation efficiencies (≥40%)' are required is no longer supported; c would fall in the range already inferred from JWST lensed galaxies. The authors should either justify a UDG-specific d range or present the inferred c as a function of d across a wider interval.
- [Section 6, zero point and Fig. 2] The model tracks in Fig. 2 are anchored by defining the M_GC/M_* = 0 stellar population as the average of the five sample UDGs with M_GC/M_* < 1.5%, with the high-ratio endpoint set to the assumed mean stellar population of old, metal-poor GCs. Because the low-ratio zero point comes from the same sample that is then compared with the model, the predicted trend toward more GC-like populations with increasing M_GC/M_* is partly built into the model construction rather than emerging as an independent test. This is acknowledged as a limitation ('This can be improved in the future...'), but it should be stated more prominently, and an external zero point based on classical dwarf stellar populations should be explored to see whether the trend survives.
- [Table 1 and Section 6] The empirical support for the claimed trends is weak. The sample contains only 12 UDGs, mostly in high-density environments, with heterogeneous GC count and stellar population measurements, and the catalogue itself is biased against GC-poor UDGs (as stated in Section 6). The claimed metallicity decrease of ~0.45 ± 0.1 dex and the weak age trend are not quantified by any fit or rank correlation; inspection of Table 1 shows substantial scatter (e.g., DF17 at M_GC/M_* = 2.1% has [M/H] = –0.83 while DF44 at 4.9% has [M/H] = –1.33, yet PUDG-R84 at 3.9% has [M/H] = –1.48). The [Mg/Fe] panel shows no clear trend. The statement that 'the current data loosely follow the model' would be more convincing with a quantitative significance estimate and an explicit discussion of how selection biases affect the comparison.
minor comments (5)
- [Section 2] For NGVSUDG-20, '11 GC candidates with a large uncertainty of ±8.6' should specify whether this is a Poisson uncertainty, a total uncertainty, or a confidence interval, and the sign convention should be clarified.
- [Fig. 1 caption] The caption would benefit from stating the range of c shown and from marking the specific c values at which the curves intersect the 10% dashed line, since those intersections carry the paper's main quantitative message.
- [Fig. 2 caption] The long-dashed blue line representing a constant GC-like stellar population is not defined by an equation or by explicit assumptions in the text; please state how this limiting case is constructed.
- [Section 6, Fig. 2] The top axis showing approximate S_N values is not introduced in the text; define the conversion from M_GC/M_* to S_N and state the assumed mass-to-light ratio and GC mean mass used for this axis.
- [Section 7] For Eridanus II, the statement that M_GC/M_* ≈ 4% 'from its only GC' should clarify that this assumes the universal mean GC mass of 2 × 10^5 M_sun; the dependence on this assumption is worth stating.
Circularity Check
No significant circularity: the M_GC/M* model is an algebraic consequence of independently adopted c and d inputs, and the stellar-population comparison has independent content at intermediate and high ratios.
full rationale
The paper's central equation (6) is derived from the definitions c = M_GC,i/M_*,i and d = 1 - M_GC,f/M_GC,i, together with the assumption that disrupted GC stars join the field population. The inference that M_GC/M* ~ 10% requires c >= 0.4 for d = 0.7 is algebra following from these definitions, not an empirical prediction fitted to the UDG data. The adopted ranges for c (roughly 30-70%) and d (0.7-0.9) come from external sources: JWST lensed-galaxy cluster mass fractions and the Moreno-Hilario et al. (2024) dwarf-galaxy simulation, respectively. The paper does not fit c or d to the UDG sample used for comparison. The stellar-population tracks in Fig. 2 are anchored at M_GC/M* = 0 to the average of five low-ratio UDGs in the sample, but the paper explicitly labels this a zero point, acknowledges it can be improved with more GC-poor UDG data, and does not present it as a prediction. The high-ratio endpoint uses an independent Milky Way GC compilation, and intermediate/high-ratio UDGs such as NGC5846_UDG1 are not used to set the track, so the comparison retains independent content. Self-citations such as Forbes & Gannon (2024) and Burkert & Forbes (2020) provide context on halo masses and GC richness but are not load-bearing for the algebraic model. The choice of d = 0.7-0.9 for UDGs may be debatable given the same simulation's trend toward lower disruption at lower density, but that is an assumption sensitivity, not circularity. No step reduces the conclusion to its input by construction.
Assumptions & free parameters
free parameters (6)
- GC formation efficiency c =
varied; 0.4 to 1.0 used to reach 10% ratio
- GC destruction fraction d =
assumed 0.7 to 0.9
- Mean GC mass =
2e5 solar masses
- Puffy dwarf zero point metallicity [M/H] =
-1.03 dex
- Puffy dwarf zero point age =
9.5 Gyr
- Puffy dwarf zero point [Mg/Fe] =
0.58 dex
assumptions (4)
- domain assumption The current field star mass equals the initial field star mass plus the mass of stars from disrupted GCs, with no loss or gain of field stars via tidal stripping or accretion (Equation 3).
- domain assumption The galaxy is quenched early with no ongoing star formation after the epoch of GC formation.
- ad hoc to paper A single global destruction fraction d applies uniformly to all GCs in the system.
- domain assumption JWST lensed galaxy cluster mass fractions are representative of GC formation efficiencies in UDG progenitors at high redshift.
Cite this review
Pith. "Pith review of Why do some Ultra Diffuse Galaxies have Rich Globular Cluster Systems?." pith.science (2026). https://pith.science/paper/7ZDK7VJW
@misc{pith2026241206155,
author = {Pith},
title = {Pith review of: Why do some Ultra Diffuse Galaxies have Rich Globular Cluster Systems?},
year = {2026},
howpublished = {\url{https://pith.science/paper/7ZDK7VJW}},
note = {Machine review of arXiv:2412.06155}
}
abstract
Some ultra diffuse galaxies (UDGs) reveal many more globular clusters (GCs) than classical dwarf galaxies of the same stellar mass. These UDGs, with a mass in their GC system (M$_{GC}$) approaching 10\% of their host galaxy stellar mass (M$_{\ast}$), are also inferred to have high halo mass to stellar mass ratios (M$_{halo}$/M$_{\ast}$). They have been dubbed Failed Galaxies. It is unknown what role high GC formation efficiencies and/or low destruction rates play in determining the high M$_{GC}$/M$_{\ast}$ ratios of some UDGs. Here we present a simple model, which is informed by recent JWST observations of lensed galaxies and by a simulation in the literature of GC mass loss and tidal disruption in dwarf galaxies. With this simple model, we aim to constrain the effects of GC efficiency/destruction on the observed GC richness of UDGs and their variation with the integrated stellar populations of UDGs. We assume no ongoing star formation (i.e. quenching at early times) and that the disrupted GCs contribute their stars to those of the host galaxy. We find that UDGs, with high M$_{GC}$/M$_{\ast}$ ratios today, are most likely the result of very high GC formation efficiencies combined with modest rates of GC destruction. The current data loosely follow the model that ranges from the mean stellar population of classical dwarfs to that of metal-poor GCs as M$_{GC}$/M$_{\ast}$ increases. As more data becomes available for UDGs, our simple model can be refined and tested further.
Figures
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