REVIEW 3 major objections 2 minor 2 cited by
The LOFAR Two-metre Sky Survey Deep Fields: new probabilistic spectroscopic classifications and the accretion rates of radio galaxies
T0 review · 3 major / 2 minor · reviewed 2026-08-05 · deepseek-v4-flash
Pith's one-line read Probabilistic spectroscopy of 4,471 faint radio sources out to z<0.947 reveals distinct accretion-rate distributions for high- and low-excitation AGN.
desk verdict Useful probabilistic classification catalog with new DESI spectra; the accretion-rate dichotomy rests on a threshold that could manufacture the result and needs a probability-weighted check. 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 engine is a Monte Carlo combination of three diagnostics applied to each source: (i) a radio excess over what star formation would predict, (ii) the BPT diagram—a plane of optical emission-line ratios separating star-forming galaxies from AGN—and (iii) a modified Mass Excitation diagram, which uses stellar mass with emission-line excitation to catch AGN that BPT misses. Sampling over measurement errors yields a probability for each of four classes: star-forming galaxy, radio-quiet AGN, high-excitation radio galaxy, and low-excitation radio galaxy. The authors then keep sources with at least 90% probability in one class as their high-confidence spectroscopic sample, the tool used to compa
What would settle it
Compute the Eddington-scaled accretion-rate distributions using the full 4,471-source catalogue with each source weighted by its class probability, rather than only sources passing the 90% reliability cut. If the two AGN classes overlap under probability weighting, the claimed bimodality is an artifact of the threshold.
Extended reading notes
Core claim
The paper claims that a probabilistic classifier—built from radio excess, the BPT diagram, and a modified Mass Excitation diagram—can assign reliable class probabilities (star-forming galaxy, radio-quiet AGN, high-excitation radio galaxy, low-excitation radio galaxy) to faint radio sources across z < 0.947, nearly doubling the redshift range of the earlier probabilistic framework. Applying a 90% reliability cut gives a high-confidence spectroscopic sample. On this sample, the accretion rates scaled by Eddington luminosity of radiatively efficient AGN (high-excitation radio galaxies and radio-quiet AGN) and radiatively inefficient AGN (low-excitation radio galaxies) form distinct distribution
Load-bearing premise
The 90% reliability threshold is assumed to return a high-confidence sample that is complete and unbiased; if it preferentially captures strong emission-line objects or skews the redshift distribution, the claimed separation between accretion-rate distributions could be a selection artifact rather than a physical distinction.
Editorial extensions
If this is right
- Photometric classification, the only option for most of the sky, undercounts radio-quiet AGN by a factor of 2 to 5 in this population; existing catalogues built on it will need recalibration against spectroscopic labels.
- The clear separation of Eddington-scaled accretion-rate distributions supports a physical dichotomy between radiatively efficient and inefficient accretion modes, rather than a continuous distribution.
- The probabilistic framework now spans the latter half of cosmic history, so the same machinery can measure how the star-forming/AGN mix evolves with redshift.
- High-confidence spectroscopic subsets can serve as training labels for machine-learning classifiers on larger photometric samples.
- The remaining disagreements motivate new spectroscopic campaigns targeting faint radio sources in advance of the next-generation radio era.
Reading between the lines
- A testable consequence the paper does not draw: if the 90% reliability cut is replaced by probability-weighting over all 4,471 sources, the separation between accretion-rate distributions should persist if it is physical; if it blurs, selection is the cause.
- The 2–5 times higher radio-quiet AGN fraction implies that shallow or narrow-band photometric surveys may be systematically missing a substantial population of black-hole growth, shifting estimates of the cosmic accretion-rate density.
- Applying the same probabilistic classifier to other deep radio fields at similar or higher redshift could map the fraction of radiatively efficient AGN as a function of cosmic time, giving an evolutionary test the current z < 0.947 sample cannot provide.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a probabilistic classification of 4,471 radio sources at z < 0.947 in the LoTSS Deep Fields, using DESI spectra and a combination of radio-excess identification, BPT diagnostics, and a modified Mass-Excitation diagram, with Monte Carlo methods to assign probabilities to four classes: SFG, RQ AGN, HERG, and LERG. The authors report that this extends the redshift range of previous probabilistic frameworks by roughly a factor of two. Applying a 90% reliability threshold, they compare their spectroscopic classifications with photometric classifications, finding about 77% overall agreement but a 2–5 times larger RQ AGN fraction. The central physical claim is that high-confidence spectroscopic classifications show clearly distinct Eddington-scaled accretion-rate distributions for radiatively efficient and inefficient AGN, in contrast to recent literature. The full text of the manuscript is corrupted to the point of unreadability, so the detailed methodology, equations, figures, and tables cannot be audited from the provided material.
Significance. If the results hold, the paper would make two useful contributions: a probabilistic classification tool for faint radio sources across the latter half of cosmic history, and a spectroscopic benchmark for testing photometric classification methods. The reported discrepancy in RQ AGN counts is empirically interesting, and the claimed bimodality in Eddington-scaled accretion rates directly engages an active literature debate. The use of DESI spectroscopic data and a Monte Carlo framework is appropriate for the problem. However, because the central physical claim rests on a hard reliability threshold and on Monte Carlo priors, and because the full text is unavailable for scrutiny, the significance cannot be fully assessed from the submitted version. The lack of any visible robustness tests, completeness estimates, or error bars on the accretion-rate distributions in the abstract further limits confidence.
major comments (3)
- [Full text (all sections)] The manuscript text is severely corrupted (mojibake) and none of the methodology, equations, tables, or figures can be read. This is not a presentation issue but a load-bearing obstacle: the central claims about the 90% reliability threshold, Monte Carlo priors, black-hole mass estimates, and the accretion-rate distributions cannot be checked. A corrected, readable manuscript is required before any further evaluation.
- [Abstract] The claim that 'high-confidence spectroscopic classifications show that radiatively-efficient and inefficient AGN exhibit clearly distinct Eddington-scaled accretion rate distributions' depends entirely on the 90% reliability threshold. A hard selection cut can preferentially retain strong-lined, unambiguous objects and discard intermediate-SNR or intermediate-Eddington-ratio sources, artificially creating or exaggerating bimodality. The abstract provides no evidence that the authors tested the sensitivity of their result to the threshold, nor that they repeated the analysis with probability-weighted samples or completeness corrections. This is the most load-bearing point in the paper and needs explicit robustness analysis.
- [Monte Carlo priors (methods unavailable in corrupted text)] The classification probabilities are computed with Monte Carlo methods using priors for SFG, RQ AGN, HERG, and LERG. If these priors are inherited from earlier work by the same authors, the accretion-rate comparison may be partly circular: the prior could already encode a separation between HERGs and LERGs, and the high-confidence selection could then reinforce that separation. The manuscript must demonstrate that the claimed distinct Eddington-ratio distributions are insensitive to reasonable variations in the priors and to the choice of black-hole mass scaling relations, especially since the latter may use the same emission-line diagnostics that drive the classification.
minor comments (2)
- [Abstract] There is a typo in the phrase 'high-\low-excitation radio galaxy'; this should be 'high-/low-excitation.'
- [Abstract] No error bars, uncertainties, or sample sizes are reported for the claimed accretion-rate distributions, making it difficult to judge the statistical significance of the reported bimodality.
Circularity Check
HERG/LERG accretion-rate dichotomy is partly built into the classifier: the same emission-line diagnostics define both the class and the accretion-rate proxy.
-
self definitional
[Abstract (final claim); classification inputs (BPT, modified Mass-Excitation) described in same abstract]
"Furthermore, our high-confidence spectroscopic classifications show that radiatively-efficient and inefficient AGN exhibit clearly distinct Eddington-scaled accretion rate distributions, contrary to recent findings in the literature."
The classes HERG and LERG are assigned through emission-line diagnostics: the BPT diagram and a modified Mass-Excitation diagram, both of which use [O III]/Hbeta (and [N II]/Halpha or equivalent) as primary inputs. The Eddington-scaled accretion rate is, in the same spectral framework, typically estimated from the [O III] luminosity (bolometric proxy) divided by a black-hole mass derived from stellar or line-width scaling relations. Thus the same spectra that determine whether a source is called HERG (strong narrow-line excitation) or LERG (weak lines) also feed the numerator of the accretion-rate ratio. A high-confidence HERG/LERG split is therefore to some extent a cut on the very quantity whose distribution is then reported as bimodal. This does not make the quantitative distributions v
full rationale
The paper's central physical claim is that radiatively-efficient and inefficient AGN show clearly distinct Eddington-scaled accretion-rate distributions. That claim is not auditable in full-text detail because the provided full text is garbled, so the assessment rests on the abstract's description of the method. The abstract says the probabilistic classification combines radio excess, the BPT diagram, and a modified Mass-Excitation diagram, and then the same high-confidence spectroscopic classifications are used to report the accretion-rate result. Since the BPT and MEx classifiers are driven by the same narrow emission lines (especially [O III]) that are the standard bolometric-luminosity proxy in Eddington-ratio estimates, the reported HERG/LERG separation is partially self-definitional: the classification variable and the accretion-rate numerator share a common observable. This is a genuine but partial circularity; black-hole masses and radio luminosities provide independent information, so the quantitative distributions could in principle fail to separate. The comparison with photometric classifications (77% agreement) is a legitimate external benchmark and is not circular. The 90% reliability threshold concern raised by the reader is a potential selection-bias/correctness risk, not a circularity, and cannot be confirmed from the garbled text. No load-bearing self-citation chain is visible in the readable portions, so the score is driven by the definitional overlap between the classification diagnostics and the accretion-rate proxy.
Assumptions & free parameters
free parameters (2)
- 90% reliability threshold =
0.9
- Monte Carlo class priors
assumptions (3)
- domain assumption The BPT diagram separates star-forming galaxies from AGN in this redshift and luminosity regime.
- domain assumption The modified Mass Excitation diagram provides a reliable alternative to BPT when certain lines are unavailable.
- domain assumption Radio excess relative to the star-formation rate indicates AGN activity.
Cite this review
Pith. "Pith review of The LOFAR Two-metre Sky Survey Deep Fields: new probabilistic spectroscopic classifications and the accretion rates of radio galaxies." pith.science (2026). https://pith.science/paper/6737EMJ7
@misc{pith2026250818347,
author = {Pith},
title = {Pith review of: The LOFAR Two-metre Sky Survey Deep Fields: new probabilistic spectroscopic classifications and the accretion rates of radio galaxies},
year = {2026},
howpublished = {\url{https://pith.science/paper/6737EMJ7}},
note = {Machine review of arXiv:2508.18347}
}
read the original abstract
The faint radio-source population includes sources dominated both by star formation and active galactic nuclei (AGN), encoding the evolution of activity in the Universe. To investigate its nature, we probabilistically classified 4,471 radio sources at z < 0.947 using low-frequency radio data from the LoTSS Deep Fields alongside a multi-component model for nebular emission, sampled by spectra obtained with the Dark Energy Spectroscopic Instrument (DESI). This was done by combining three tools: (i) the identification of a radio excess, (ii) the BPT diagram, and (iii) a modified Mass Excitation diagram, alongside Monte Carlo methods to estimate the probability that each source is either a star-forming galaxy (SFG), a radio-quiet AGN (RQ AGN), or a high-\low-excitation radio galaxy (HERG or LERG). This approach extends the probabilistic classification framework of previous works by nearly doubling the redshift range, such that we can now probabilistically classify sources over the latter half of cosmic history. Often regarded as the 'gold standard' method, spectroscopic classifications allow us to evaluate the performance of other methods. Using a 90 per cent reliability threshold, we find reasonable overall agreement (~77 per cent) with state-of-the-art photometric classifications, but significant differences remain, including that we identify 2-5 times more RQ AGN. Furthermore, our high-confidence spectroscopic classifications show that radiatively-efficient and inefficient AGN exhibit clearly distinct Eddington-scaled accretion rate distributions, contrary to recent findings in the literature. Overall, our results highlight the need for new and forthcoming spectroscopic campaigns targeting radio sources, on the pathway to the SKA.
Forward citations
Cited by 2 Pith papers
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A MIGHTEE robust measurement of the star formation rate-radio correlation
The SFR–1.4 GHz radio correlation is log10(SFR) = 0.790(L′)+1.244(1+z)^0.122−0.033M′ with 0.178 dex scatter, showing significant redshift but weak mass dependence when AGN are treated probabilistically.
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The DESI View of the Faint Radio Source Population in LoTSS DR2
Probabilistic spectroscopic classification of 251k LoTSS radio sources yields the largest high-confidence sample and confirms LERGs accrete below ~1% Eddington while HERGs accrete above it.
Reference graph
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write newline
" write newline "" before.all 'output.state := FUNCTION fin.entry write newline FUNCTION new.block output.state before.all = 'skip after.block 'output.state := if FUNCTION new.sentence output.state after.block = 'skip output.state before.all = 'skip after.sentence 'output.stat...
Reviewed August 5, 2026 · model on record in the stance chip above.
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