REVIEW 2 major objections 4 minor 110 references
Confirming HSC strong lens candidates with DESI Spectroscopy. I. Project overview and first results
T0 review · 2 major / 4 minor · reviewed 2026-08-07 · deepseek-v4-flash
Pith's one-line read Large spectroscopic surveys can confirm strong gravitational lenses in bulk from serendipitous spectra.
desk verdict Useful, honest paper showing DESI serendipitous spectra can confirm HSC lens candidates, but roughly a third of the 27 confirmed systems hang on single-line Lyα IDs that should be labeled provisional. 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 mechanism is cross-matching imaging-selected strong-lens candidates against a large spectroscopic survey's redshift catalog, then visually inspecting the DESI spectra for features at two different redshifts: the lens galaxy's absorption or emission lines and the background source's emission lines. The 6-arcsecond matching radius matches typical lens-source separations and captures cases where DESI fibers accidentally landed on the lens, a lensed image, or both. Source redshifts are measured by Gaussian fits to multiple emission lines where available, or by skewed-Gaussian fits to single asymmetric lines interpreted as Ly-alpha, while contaminated lens spectra are refit with galaxy eigenspectra after masking source emission lines.
What would settle it
Obtain deeper spectra or independent photometric redshifts for the single-line systems (A1.2, A1.10, and A2.1 through A2.7) and check for a second emission line, a Ly-alpha forest break, or a continuum discontinuity at the adopted source redshift; absence of corroborating features would overturn those individual confirmations.
Extended reading notes
Core claim
The paper's central claim is that serendipitous spectra from a large multi-object spectroscopic survey can serve as a bulk confirmation tool for imaging-selected strong-lens candidates. Matching 3,950 HSC candidates to DESI DR1 within 6'', the authors find 2,111 unique candidates with at least one DESI spectrum, and after visual inspection of about 500 selected spectra they measure both lens and source redshifts for 27 systems, thereby confirming their lensing nature. Eight of these confirmed systems have lens redshifts between 0.814 and 0.998, roughly doubling the previously known sample of high-redshift strong lenses, and two are strongly lensed quasars. An additional 76 candidates are verified to contain z > 0.8 lensing galaxies, and one candidate shows a quasar inside its putative lensing galaxy, a configuration that can yield a precise total mass for a quasar host. The authors project that the final DESI data release will confirm about 100 HSC strong-lens systems and provide lens or source redshifts for nearly all existing HSC candidates.
Load-bearing premise
The counts of confirmed high-redshift systems rest on interpreting a single detected emission line as Ly-alpha in several Category 1 and Category 2 cases; if any of those lines is actually a lower-redshift feature such as [O II], the source would lie in front of the lens and that candidate would not be confirmed.
Editorial extensions
If this is right
- Twenty-seven HSC candidates are promoted from imaging candidates to spectroscopically confirmed strong lenses, including eight with lens redshifts above 0.8.
- The sample of verified z > 0.8 lensing galaxies grows by 76 systems, offering new tracers of galaxy mass evolution over the second half of cosmic history.
- The quasar-containing lens 092121+031744 provides a rare opportunity to measure the total central mass of a quasar host galaxy to roughly 5% precision, linking black-hole and host-galaxy properties.
- Extrapolating from DESI DR1 to the full DESI survey implies roughly 100 confirmed HSC systems and lens or source redshifts for nearly all existing HSC candidates.
- The same cross-matching and visual-inspection approach applied to other strong-lens candidate catalogs inside the DESI footprint should yield many more confirmations without dedicated observing time.
Reading between the lines
- If the single-line Ly-alpha identifications survive deeper follow-up, the confirmed z > 0.8 lens sample would grow from the roughly ten previously known systems to about eighteen, sharpening constraints on the redshift evolution of galaxy mass profiles.
- The roughly 50% serendipitous overlap rate is set by DESI's target selection function, not by lensing physics; future surveys with different selection functions will need to model this bias when using serendipitous samples for statistical lens studies.
- A direct extension would be to apply the same inspection pipeline to the remaining three-quarters of matched HSC candidates not examined here, plus later DESI data releases, which should push the confirmed sample well past 100 systems.
- The weakest single-line source redshifts could be tested at no extra telescope cost by stacking multiple DESI spectra of the same source, as already done for 090548+004743 and 090938+002842, providing an internal cross-check on the line identification.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This paper investigates whether large-scale spectroscopic surveys can efficiently confirm imaging-selected strong-lens candidates. The authors cross-match 3,950 HSC-SSP strong-lens candidates with DESI DR1, find 2,111 unique systems with at least one DESI fiber within 6 arcsec, and visually inspect the DESI spectra of roughly 500 systems selected into three categories. They report 27 systems with both lens and source redshifts (Category 1), 76 candidates with lensing galaxies at z > 0.8 (Category 2), and 10 quasar-related systems (Category 3), including two confirmed lensed quasars and one quasar acting as a lens. The paper argues that serendipitous DESI spectroscopy can confirm strong lenses in bulk, and it projects that the final DESI data release will confirm roughly 100 HSC strong-lens systems. The appendix provides individual notes, image cutouts, and spectra for all systems.
Significance. If the 27 confirmations hold, the paper demonstrates a scalable, low-cost path for confirming strong-lens candidates using existing spectroscopic survey data, with the eight z > 0.8 lenses representing a substantial increase in the number of such systems. The paper is transparent and reproducible: all cutouts and spectra are shown, redshift-fitting procedures are described, and the catalog matching and selection criteria are clear. The main weakness is that about one-third of the Category 1 source redshifts, and most of the Category 2 source redshifts, rest on single emission lines interpreted as Lyα with no independent confirmation; the paper discloses this interpretation but still labels these systems as confirmed without qualification. If even a few of these identifications are wrong, the headline count of 27 and the associated scientific claims are weakened.
major comments (2)
- [Appendix A1 and A2] The source redshifts for A1.2, A1.7, A1.10, A2.1, A2.2, A2.3, A2.4, A2.6, and A2.7 rest on a single emission line interpreted as Lyα, with no second line or continuum break presented as confirmation. For A1.10 the line SNR is only 3.36. The observed wavelengths (3848 to 5293 Å) are also consistent with [O II] λ3727 at z ≈ 0.03 to 0.42, in which case the source would be in front of the lens and the system would not be a strong lens. The paper explicitly discloses these as interpretations, but the abstract and Section 5 state that all 27 systems are confirmed without qualification. This is load-bearing for the headline count and for the eight high-redshift lens systems; I recommend either providing additional evidence for the Lyα identifications (e.g., asymmetric profile strength, continuum break, or exclusion of [O II] via the absence of the doublet) or reclassifying these systems as tentative and adjusting the counts and claims accordingly.
- [Section 5] The sentence 'we measured both lens and source redshifts for 27 strong-lens systems, thereby confirming their lensing nature' treats all 27 systems as having the same confirmation status, but the evidence is heterogeneous: some have multiple emission lines, some have double-peaked Lyα, and others have a single weak line. Given this heterogeneity, the authors should either quantify the reliability of single-line Lyα identifications in this context or explicitly distinguish between 'confirmed' and 'tentative' in the abstract and conclusions. The current wording overstates the robustness of the sample as a whole.
minor comments (4)
- [Table A1] For 094348+005926, the lens redshift uncertainty is listed as ±0.000007 in Table A1 but as ±0.00007 in the text (Section A1.8); one of these is a typo and should be corrected.
- [Section 4] The projection that the final DESI data release will confirm ≈100 HSC strong-lens systems and provide lens or source redshifts for nearly all candidates is presented as a 'simple scaling estimate' without derivation; since the current yield comes from only ~500 inspected candidates in specific categories, the text should justify why the yield scales linearly with the total number of DESI spectra rather than with the inspected subset.
- [Section 4] The phrase '76 HSC strong-lens candidates were spectroscopically confirmed to contain z > 0.8 lensing galaxies' is accurate but could be misread as confirming the strong-lens nature of these systems; consider rephrasing to 'were spectroscopically confirmed to have a lensing galaxy at z > 0.8' for clarity.
- [Section 3.3] For 130733+001122, the lensing-mass and lens-galaxy magnitude estimates in Section A3.9 are helpful, but the text should more clearly distinguish that this system remains a candidate rather than a confirmed lensed quasar, as the paper already notes the crosstalk caveat.
Circularity Check
No circularity: the paper measures redshifts from external DESI spectra and directly cross-matches candidates; the only scaling estimate is an explicitly stated proportional extrapolation.
full rationale
The paper's central claims are observational measurements, not derived quantities. Lens and source redshifts are obtained by fitting emission and absorption features in DESI spectra downloaded from an external survey archive, and the strong-lens candidates come from independent HSC imaging catalogs. No parameter is fitted to a subset of the data and then presented as a prediction of a closely related quantity: the 27 confirmed systems are simply the cases where both redshifts were measured, and the 76 high-redshift lens counts are direct redshift measurements. The forward-looking statement about the final DESI data release is explicitly a scaling estimate ('Based on simple scaling estimates, the final DESI data release ... is projected to confirm ≈100 HSC strong-lens systems'), i.e., a stated proportional extrapolation from the DR1 sample size, not a fitted or model-derived prediction. The fragile single-line Lyα identifications in Appendix A are interpretation risks about line identification, not circularity: identifying a line as Lyα does not assume the lensing confirmation that the resulting redshift is used to support, and the paper openly labels these as interpretations ('which we interpreted as Lyα emission from the source'). Self-citations appear only for candidate discovery papers and for a fitting recipe ([107]), none of which supplies the lensing confirmation or the redshift measurements. The analysis is therefore self-contained against external data and contains no step that reduces to its own inputs.
Assumptions & free parameters
assumptions (3)
- domain assumption A single emission line in a candidate source spectrum is Lyα at high redshift when its wavelength and profile are consistent with Lyα.
- domain assumption DESI DR1 reported redshifts and spectypes are correct for the galaxies and quasars used in the matches.
- domain assumption The HSC strong-lens candidate catalog (grades A/B/C) contains a high fraction of genuine lenses; grade A indicates 'definite lens' based on visual inspection.
Cite this review
Pith. "Pith review of Confirming HSC strong lens candidates with DESI Spectroscopy. I. Project overview and first results." pith.science (2026). https://pith.science/paper/W4LLUXC7
@misc{pith2026250516158,
author = {Pith},
title = {Pith review of: Confirming HSC strong lens candidates with DESI Spectroscopy. I. Project overview and first results},
year = {2026},
howpublished = {\url{https://pith.science/paper/W4LLUXC7}},
note = {Machine review of arXiv:2505.16158}
}
abstract
Accurate redshift determinations of both lenses and sources are critical for confirming strong-lens systems and fully realizing their scientific value. However, the thousands of strong-lens candidates now routinely discovered in wide-field imaging surveys make one-by-one follow-up observations impractical. In this work, we investigate the capability and efficiency of large-scale spectroscopic surveys in confirming strong-lens systems. As a case study, we cross-match strong lens candidates identified from the Hyper Suprime-Cam Subaru Strategic Program with Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). We find that DESI DR1 serendipitously observed putative lenses and/or lensed images in approximately 50\% of these candidates. Analyzing the DESI spectra for $\approx 500$ matched candidates that meet our selection criteria, we determine both lens and source redshifts for 27 systems. Additionally, 76 candidate systems feature lensing galaxies at $z > 0.8$, and one candidate system contains a quasar within its lensing galaxy. Applying this approach to other strong-lens candidates will yield many more confirmations, with a further several-fold increase anticipated from the final DESI data release. Our results highlight the growing importance of large-scale spectroscopic surveys in advancing strong lensing discoveries and science.
Figures
Reference graph
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