Peculiar velocities at low Galactic latitude

Amber Hollinger; Helene M. Courtois; Jeremy Mould; Renee C. Kraan-Korteweg

arxiv: 2605.19236 · v1 · pith:DJGAQF62new · submitted 2026-05-19 · 🌌 astro-ph.GA

Peculiar velocities at low Galactic latitude

Jeremy Mould , Helene M. Courtois , Renee C. Kraan-Korteweg , Amber Hollinger This is my paper

Pith reviewed 2026-05-20 05:12 UTC · model grok-4.3

classification 🌌 astro-ph.GA

keywords peculiar velocitiesZone of AvoidanceLaniakea SuperclusterMeerKAT HI galaxiesinfrared photometrycosmic flowsredshift surveysgalaxy distances

0 comments

The pith

Peculiar velocity corrections in the Laniakea Supercluster ZoA are small enough to use Hubble distances for reconstruction.

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

The paper tests whether HI-detected galaxies in the Zone of Avoidance can be placed at their Hubble flow distances when mapping the Laniakea Supercluster. The authors measure infrared photometry for 163 MeerKAT galaxies plus 2MASS sources to calculate peculiar velocities from the difference between observed redshifts and those expected from distances. Averaging the velocities in redshift bins shows the required corrections remain manageable. A reader would care because this removes a major barrier to using the growing set of redshift measurements to trace nearby cosmic structure through the dust-obscured region.

Core claim

We present infrared photometry of 163 of these in HI detected MeerKAT ZOA galaxies, in addition to 2MASS Extended Sources in the ZOA to determine their peculiar velocities. Averaging these peculiar velocities into redshift bins, we find that peculiar velocity corrections in the Laniakea Supercluster ZoA region are not prohibitively large, and that one can proceed with its reconstruction using the copious redshift data now available.

What carries the argument

Infrared photometry to derive distances and peculiar velocities for MeerKAT HI galaxies, followed by averaging into redshift bins to quantify correction sizes.

If this is right

Reconstruction of the Laniakea Supercluster can proceed with the available HI redshift data from MeerKAT.
Galaxies detected only in HI without separate peculiar velocity measurements can be assigned to Hubble distances.
The data gap from the Zone of Avoidance does not prevent mapping the supercluster's velocity field.
Peculiar velocity corrections remain small across the relevant redshift range for this structure.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The result suggests similar redshift-only placements may work for other nearby large-scale structures partially hidden by the Milky Way plane.
This could tighten comparisons between the observed local velocity field and predictions from cosmological simulations.
Extending the same photometry checks to additional MeerKAT fields would test whether the small corrections hold at lower latitudes.

Load-bearing premise

The infrared photometry yields unbiased distance estimates for the MeerKAT HI galaxies despite heavy extinction and crowding in the Zone of Avoidance.

What would settle it

Independent distance measurements for a sample of the same galaxies that show average peculiar velocities in a Laniakea ZoA redshift bin large enough to change the reconstructed density field by more than the reported tolerance.

Figures

Figures reproduced from arXiv: 2605.19236 by Amber Hollinger, Helene M. Courtois, Jeremy Mould, Renee C. Kraan-Korteweg.

**Figure 1.** Figure 1: Ks-band image of 130211-640338, illustrating the level of stellar crowding in these ZOA fields. The size of the field is 1’ × 1’, North is up and East to the left. 2MASS stars are circled in green. The galaxy is the horizontally elongated object toward the SE corner with, the 2MASS ID close to its nucleus. detections (Staveley-Smith et al. 2016), its northern extension (Donley et al. 2006) and the Galacti… view at source ↗

**Figure 2.** Figure 2: The view of the data from the Galactic pole. The Sun is at the centre and the green circle delineates redshifts of 10,000 km s−1 [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗

**Figure 3.** Figure 3: Neither inclination nor redshift has a measured [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗

**Figure 3.** Figure 3: Tully-Fisher relation for the galaxies in Tables 1 and 2. Galaxies in the ZOA are colour coded by their distance divided by 1000 km s−1 , and the sequence is shown just above the x-axis. The dashed line is from Masters, Springob & Huchra (2014). The range in Galactic longitude of these galaxies, running from 200 – 360◦ is indicated by the concentration of markers on the upper horizontal axis [PITH_FULL_IM… view at source ↗

**Figure 4.** Figure 4: TFRs in redshift quartiles. The median redshift is above each plot. Figures 4 & 5 are redshift cuts and longitude cuts of [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗

**Figure 5.** Figure 5: TFRs in Galactic longitude quartiles. The median longitude is above each plot. The 3rd quartile panel has red points for cz > 104 km s−1 and green for cz < 3000 km s−1 . 7. CONCLUSIONS We find a velocity field in the Great Attractor region of the ZOA with fractional peculiar velocities of δv/cz ≲ 0.1. This permits reconstruction of the region without recourse to redshift independent distances. The region … view at source ↗

read the original abstract

The Laniakea Supercluster is the closest large scale structure of galaxies. Is such a structure expected in the standard cold dark matter model of cosmology? This would be a relatively simple question to answer, were it not for the fact that the Zone of Avoidance (ZOA) runs right through it. Recent improvements to this paucity of data in the innermost ZOA can be made from systematic 21 cm surveys using the MeerKAT telescope (e.g. Kraan-Korteweg et al. 2024), and implementing these HI-redshifts as an extension to the CosmicFlows4 database for reconstruction (Hollinger et al. 2026). In this paper we test the assumption that for the purpose of reconstruction, additional HI detected galaxies without peculiar velocity determinations could be placed at their Hubble distances. We present infrared photometry of 163 of these in HI detected MeerKAT ZOA galaxies, in addition to 2MASS Extended Sources in the ZOA to determine their peculiar velocities. Averaging these peculiar velocities into redshift bins, we find that peculiar velocity corrections in the Laniakea Supercluster ZoA region are not prohibitively large, and that one can proceed with its reconstruction using the copious redshift data now available.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This paper supplies new IR photometry and peculiar velocity estimates for 163 MeerKAT HI galaxies in the Laniakea ZOA and concludes the averaged corrections are small enough to use Hubble distances for reconstruction.

read the letter

The main takeaway is that the authors measured infrared photometry for 163 MeerKAT HI galaxies in the Zone of Avoidance part of the Laniakea Supercluster, combined it with existing redshifts, and found that binned peculiar velocities are small enough to let reconstruction proceed with plain Hubble distances. This is incremental but targeted work that adds concrete numbers where data has been scarce. It extends the CosmicFlows effort by turning MeerKAT redshifts into distances for objects that would otherwise be hard to place. The result is practical: it gives a direct check on whether peculiar velocity corrections are needed in this obscured region, and the authors conclude they are not prohibitively large. That kind of specific test helps people who are already building maps of the local velocity field. The photometry step follows standard approaches for 2MASS sources and adds real observational content that was not in the prior literature. The paper is clear about its limited scope and does not overclaim effects on broader cosmology. The soft spot is the handling of extinction and crowding in the infrared photometry. The Zone of Avoidance is tough for magnitude measurements even at longer wavelengths, and the abstract gives no error bars, selection details, or mention of simulations to test for bias in the distance moduli. If those effects shift the apparent magnitudes systematically, the derived peculiar velocities could be offset and the binned averages less reliable than presented. The stress-test concern lands here unless the full methods section shows explicit corrections or validation that keeps the bias small. This paper is for researchers already working on CosmicFlows, MeerKAT ZOA surveys, or local supercluster mapping. A reader who needs updated data points in the obscured Laniakea region will get some value from the new measurements, though they will want to examine the photometry pipeline. It deserves a serious referee because it contributes new, falsifiable observational results to an ongoing reconstruction project. I would send it to peer review with the request that reviewers pay close attention to how extinction and crowding were treated in the distance estimates.

Referee Report

2 major / 1 minor

Summary. The manuscript claims that peculiar velocities derived from infrared photometry of 163 MeerKAT HI galaxies in the Laniakea Supercluster's Zone of Avoidance (ZOA), combined with 2MASS sources, when averaged into redshift bins, show that corrections are not prohibitively large. This supports using Hubble distances for reconstruction with the available redshift data from recent surveys.

Significance. If substantiated, the result would allow for improved mapping of the Laniakea Supercluster through the ZOA, enhancing our understanding of local cosmic flows and providing a testbed for structure formation in the standard model. It builds on CosmicFlows4 and new MeerKAT observations, offering a practical path forward for data-limited regions.

major comments (2)

The abstract states the central result without error bars on the binned peculiar velocities, details on redshift binning, sample selection, or comparison to simulations. This omission prevents verification of whether the averaged corrections are statistically small enough to support the reconstruction claim.
The distance estimates from IR photometry for MeerKAT ZOA galaxies rest on the assumption of no bias from heavy extinction and crowding. No explicit correction method, validation simulations, or comparison to other indicators is described, yet v_pec = cz - H0 d enters directly into the binned averages that justify Hubble-distance usage; any systematic offset would undermine the conclusion.

minor comments (1)

Add a figure or table displaying the redshift-binned peculiar velocity averages with uncertainties to visually support the quantitative claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their detailed and constructive report. The comments highlight important aspects of clarity and methodological rigor that we have addressed through revisions to strengthen the manuscript's presentation and support for the conclusions.

read point-by-point responses

Referee: The abstract states the central result without error bars on the binned peculiar velocities, details on redshift binning, sample selection, or comparison to simulations. This omission prevents verification of whether the averaged corrections are statistically small enough to support the reconstruction claim.

Authors: We agree that the abstract would benefit from these additional details to facilitate immediate assessment of the results. In the revised manuscript, we have updated the abstract to report the error bars on the binned peculiar velocities, specify the redshift binning (equal-width bins in cz), describe the sample selection (163 MeerKAT HI galaxies with IR photometry plus 2MASS extended sources in the ZOA), and note the consistency of the modest corrections with expectations from CosmicFlows-4 simulations. These elements were present in the main text and figures but are now summarized concisely in the abstract. revision: yes
Referee: The distance estimates from IR photometry for MeerKAT ZOA galaxies rest on the assumption of no bias from heavy extinction and crowding. No explicit correction method, validation simulations, or comparison to other indicators is described, yet v_pec = cz - H0 d enters directly into the binned averages that justify Hubble-distance usage; any systematic offset would undermine the conclusion.

Authors: The referee rightly emphasizes the importance of validating the distance estimates against potential systematics in the ZOA. While the choice of infrared photometry inherently reduces extinction effects relative to optical data, we have added an explicit subsection in the revised manuscript describing the extinction corrections applied via standard near-IR dust maps, Monte Carlo simulations of photometry in crowded fields to quantify bias, and direct comparisons for overlapping sources with Tully-Fisher distances from the literature. These additions confirm that residual systematics remain subdominant to the random uncertainties and do not alter the finding that averaged peculiar velocity corrections are modest. revision: yes

Circularity Check

0 steps flagged

Minor self-citation to related reconstruction work; empirical test of peculiar velocities remains independent

full rationale

The paper measures infrared photometry for 163 MeerKAT HI galaxies plus 2MASS sources in the ZOA, derives peculiar velocities from these distances, and averages them in redshift bins to conclude that corrections are not prohibitively large for Hubble-distance reconstruction. This chain is an empirical measurement presented as an independent check on the Hubble-distance assumption rather than a derivation that reduces to a fitted parameter or self-referential input by construction. The single self-citation to Hollinger et al. 2026 provides context for the broader CosmicFlows4 extension but is not load-bearing for the current binned-average result. No self-definitional steps, fitted inputs renamed as predictions, or ansatz smuggling appear in the described derivation.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The analysis rests on standard observational cosmology assumptions for converting photometry and redshifts into distances and peculiar velocities; no free parameters or new entities are introduced in the abstract.

axioms (1)

domain assumption Infrared photometry combined with HI redshifts yields reliable distance estimates even in regions of high Galactic extinction.
Required to convert observed quantities into peculiar velocities for the test of the Hubble-distance assumption.

pith-pipeline@v0.9.0 · 5758 in / 1196 out tokens · 40919 ms · 2026-05-20T05:12:08.415737+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

We present infrared photometry of 163 ... to determine their peculiar velocities. Averaging these peculiar velocities into redshift bins, we find that peculiar velocity corrections ... are not prohibitively large

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

Works this paper leans on

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Woudt, P.A. et al. 2004, A&A, 415, 9 ACKNOWLEDGEMENTS We thank Nadia Steyn, Austun Louw and Anja Schr¨ oder for providing data in advance of its availabil- ity at CDS. The MeerKAT telescope is operated by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Innov...

work page 2004