REVIEW 2 major objections 1 minor 190 references
Unlocking the Full Potential of SKAO Extra-galactic Science with High-multiplex Optical Spectroscopy
T0 review · 2 major / 1 minor · reviewed 2026-06-25 · grok-4.3
Pith's one-line read Spectroscopy is essential to link SKAO radio observations to galaxy properties and histories.
desk verdict This is a position paper restating the case for optical spectroscopy with SKAO but without the source-count matching or simulations needed to back the main claims. 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
High-multiplex multi-object spectrographs delivering emission line and optical continuum diagnostics matched to radio source populations.
What would settle it
A survey showing that optical spectroscopic coverage is too shallow, narrow in wavelength, or low in source density to yield reliable redshifts or stacking signals for most SKAO radio sources.
Extended reading notes
Core claim
For all extragalactic radio source populations, this spectroscopy is essential for providing precise redshifts, separating star-formation and AGN activity, identifying accretion modes and revealing detailed host galaxy properties. It is only with the detailed emission line and optical continuum diagnostics from spectroscopy that we can begin to link the AGN and star-formation activity revealed by the radio continuum to the kinematic and chemical histories of galaxies. Crucially, extensive spectroscopy also unlocks the full potential of HI observations by enabling statistical measures of the HI content of galaxies out to z = 1 and beyond, through spectral stacking analyses, as well as compreh
Load-bearing premise
Current and planned high-multiplex optical facilities will deliver sufficient depth, wavelength coverage, and source density to match the expected SKAO radio source populations for statistical analyses such as HI stacking.
Editorial extensions
If this is right
- Precise redshifts and line diagnostics connect radio-detected AGN and star formation to galaxy kinematic and chemical histories.
- Spectral stacking yields statistical HI gas content measurements for galaxies out to z=1.
- Mapping of local environments and large-scale structure enables studies of environmental effects on the baryon cycle.
- Synergies with current and planned optical facilities extend the reach of SKAO continuum and HI surveys.
Reading between the lines
- Optimizing future optical surveys for the expected radio source density and redshift range could maximize the return on SKAO data.
- The same spectroscopic approach might reveal whether certain accretion modes are preferentially found in specific large-scale environments.
- Extending wavelength coverage to bluer or redder bands could push HI stacking and property measurements to higher redshifts.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript is a position paper arguing that high-multiplex optical spectroscopy from current and planned facilities (e.g., 4MOST, DESI, MOONS) is essential to realize the full scientific potential of SKAO radio continuum and HI surveys. It claims that spectroscopy supplies precise redshifts, separates AGN from star-formation activity, links radio properties to kinematic/chemical histories via emission-line and continuum diagnostics, enables HI spectral stacking out to z~1, and traces environment and large-scale structure for baryon-cycle studies. The text outlines synergies with existing surveys and identifies needs for future dedicated spectroscopic follow-up of radio populations.
Significance. If the asserted synergies can be realized, the work would usefully inform multi-wavelength survey planning and highlight coordination requirements between radio and optical facilities. However, the paper presents no new quantitative results, derivations, or simulations; its value lies in advocacy rather than in advancing a specific testable claim or providing machine-checked proofs or reproducible analyses.
major comments (2)
- [Abstract] Abstract and introductory sections: the central assertion that 'extensive spectroscopy also unlocks the full potential of H I observations by enabling statistical measures of the H I content of galaxies out to z = 1 and beyond, through spectral stacking analyses' is load-bearing but unsupported by any source-count matching, completeness estimates, or simulations showing what fraction of the expected SKAO radio source population at relevant flux limits can actually be targeted by the cited facilities at the required depth and wavelength coverage.
- [Abstract] The claim that spectroscopy is required to 'link the AGN and star-formation activity revealed by the radio continuum to the kinematic and chemical histories of galaxies' is presented as self-evident, yet the manuscript supplies no concrete examples or quantitative assessment of how the wavelength coverage and multiplex of planned instruments will deliver the necessary diagnostics for the SKAO populations.
minor comments (1)
- The manuscript would benefit from an explicit table or section summarizing the key parameters (depth, wavelength range, multiplex, sky coverage) of the cited spectrographs versus the expected SKAO source densities and redshift ranges.
Simulated Author's Rebuttal
We thank the referee for their review. As a position paper focused on advocacy and survey synergies rather than new quantitative analyses, we address the specific concerns about unsupported claims by agreeing to strengthen the text with additional references and brief contextual examples. We outline point-by-point responses below.
read point-by-point responses
-
Referee: [Abstract] Abstract and introductory sections: the central assertion that 'extensive spectroscopy also unlocks the full potential of H I observations by enabling statistical measures of the H I content of galaxies out to z = 1 and beyond, through spectral stacking analyses' is load-bearing but unsupported by any source-count matching, completeness estimates, or simulations showing what fraction of the expected SKAO radio source population at relevant flux limits can actually be targeted by the cited facilities at the required depth and wavelength coverage.
Authors: We agree that the HI stacking claim would be strengthened by explicit supporting references. The manuscript is an advocacy document rather than a technical simulation study, but we will revise the abstract and introduction to cite existing demonstrations of HI spectral stacking with optical redshifts (e.g., works using SDSS, GAMA, and DEVILS data that achieve stacking out to z~1 with comparable facilities). These references establish the feasibility without requiring new source-count simulations, which fall outside the paper's scope. We will also add a short sentence noting that the cited facilities' multiplex and depth are designed to overlap with SKAO continuum source densities. revision: yes
-
Referee: [Abstract] The claim that spectroscopy is required to 'link the AGN and star-formation activity revealed by the radio continuum to the kinematic and chemical histories of galaxies' is presented as self-evident, yet the manuscript supplies no concrete examples or quantitative assessment of how the wavelength coverage and multiplex of planned instruments will deliver the necessary diagnostics for the SKAO populations.
Authors: We accept that concrete examples would improve clarity. We will revise the relevant sections to include brief, referenced examples of how emission-line diagnostics (e.g., [OIII]/Heta, [NII]/Hα for AGN/SF separation and velocity dispersion for kinematics) from 4MOST, DESI, and MOONS have already been applied to radio-selected samples in the literature, and note the wavelength coverage overlap with SKAO populations. This keeps the paper within its advocacy remit while addressing the request for specificity. revision: yes
Circularity Check
No circularity; position paper with no derivations or self-referential reductions
full rationale
The manuscript is a qualitative position paper arguing for synergies between SKAO radio surveys and optical spectroscopy. It contains no equations, fitted parameters, predictions derived from inputs, or load-bearing self-citations. Claims rest on general domain reasoning about redshift needs, emission-line diagnostics, and HI stacking potential rather than any closed derivation chain. The central assertions (spectroscopy links radio properties to kinematics/chemistry; planned facilities enable stacking) are presented as scientific motivation without reducing to self-definition or prior author work by construction. This matches the default expectation of no significant circularity.
Assumptions & free parameters
Cite this review
Pith. "Pith review of Unlocking the Full Potential of SKAO Extra-galactic Science with High-multiplex Optical Spectroscopy." pith.science (2026). https://pith.science/paper/TBOVGVBY
@misc{pith2026260624744,
author = {Pith},
title = {Pith review of: Unlocking the Full Potential of SKAO Extra-galactic Science with High-multiplex Optical Spectroscopy},
year = {2026},
howpublished = {\url{https://pith.science/paper/TBOVGVBY}},
note = {Machine review of arXiv:2606.24744}
}
abstract
Parallel to the transformation in radio continuum and H I observations from SKAO pathfinders and precursors over the past decade has been the development of a new generation of multi-object spectrographs that will be equally transformational in a broad range of scientific areas. For all extragalactic radio source populations, this spectroscopy is essential for providing precise redshifts, separating star-formation and AGN activity, identifying accretion modes and revealing detailed host galaxy properties. It is only with the detailed emission line and optical continuum diagnostics from spectroscopy that we can begin to link the AGN and star-formation activity revealed by the radio continuum to the kinematic and chemical histories of galaxies. Crucially, extensive spectroscopy also unlocks the full potential of H I observations by enabling statistical measures of the H I content of galaxies out to $z = 1$ and beyond, through spectral stacking analyses, as well as comprehensively tracing the local environment and large-scale structure to enable studies of environmental effects on the baryon cycle. We outline the scientific synergies enabled by combining SKAO continuum and H I surveys with current optical spectroscopic surveys, as well as identifying the needs and scientific potential of future spectroscopic surveys dedicated to the radio source population with both existing and planned optical facilities.
Figures
Figures from the paper (2 more)
Reference graph
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2026 ,publisher =
Isabella Prandoni and author2 and author3 and author4 and author5 ,title =. 2026 ,publisher =
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Reviewed June 25, 2026 · model on record in the stance chip above.
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