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SQuIGG$\vec{L}$E: Observational Evidence of Low Ongoing Star Formation Rates in Gas-Rich Post-Starburst Galaxies

T0 review · 2 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read Gas-rich post-starburst galaxies at z~0.6 are already quiescent, showing that star formation can shut down before cold gas is depleted.

desk verdict Genuinely new Hα data confirm low SFRs in gas-rich post-starbursts; the dust correction is the one real soft spot, but the paper handles it honestly and the central claim is probably right. read the letter →

arxiv 2501.16459 v1 pith:F4OY2P4X submitted 2025-01-27 astro-ph.GA

classification astro-ph.GA
keywords post-starburstgalaxiesgalaxyquenchingstarformationratesHalphaspectroscopymoleculargasKennicutt-SchmidtrelationactivegalacticnucleiKeck/NIRES
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper uses Keck/NIRES Hα spectroscopy of 13 massive post-starburst galaxies to measure instantaneous star formation rates, testing whether the large molecular gas reservoirs found earlier in these objects could hide dust-obscured star formation. The authors find clear Hα absorption with minimal emission infilling in 11 of 13 galaxies, implying dust-corrected star formation rates below about 4 solar masses per year. Combined with the molecular gas masses detected in five of these galaxies, the objects sit more than an order of magnitude off the standard Kennicutt-Schmidt relation. The paper concludes that these galaxies have already quenched even though they retain substantial cold gas, so quenching does not require complete gas depletion.

What carries the argument

Near-infrared spectroscopy from Keck/NIRES covering the Hα region, with emission-line fluxes measured by Gaussian fitting to continuum-subtracted spectra after subtracting FAST++ stellar continuum models. Star formation rates are derived from the Hα luminosity using the Kennicutt (1998) calibration, dust-corrected using stellar attenuation from SED fitting with a fixed ratio of AV,HII/AV,* = 1.86 following Price et al. (2014). The BPT diagram built from [N ii]/Hα and available [O iii]/Hβ ratios is used to diagnose the ionization source.

What would settle it

Obtain deep, high-signal-to-noise Balmer-line measurements or far-infrared/submillimeter observations for the five CO-detected post-starburst galaxies and derive dust-corrected star formation rates without relying on the SED-based attenuation ratio; if typical AV,HII approaches 4.4 magnitudes or the inferred SFRs approach 10 solar masses per year, those galaxies would no longer be offset from the Kennicutt-Schmidt relation and the central claim would be overturned.

Watch

Extended reading notes

Core claim

The central claim is that the previously reported low star formation rates in gas-rich post-starburst galaxies are confirmed by Hα, making the galaxies very likely quiescent. Eleven of thirteen targets show clear Hα absorption with minimal infilling, corresponding to dust-corrected star formation rates below 4.1 solar masses per year, and the [N ii]/Hα ratios indicate that non-star-forming ionization sources (AGN, shocks, or hot evolved stars) may be inflating even these low rates. Therefore galaxies can quench before their cold molecular gas reservoirs are fully depleted, and the CO-detected objects are substantially offset from the Kennicutt-Schmidt relation.

Load-bearing premise

The star formation rates rest on assuming that the stellar attenuation measured from SED fitting accurately represents the dust attenuation toward the Hα-emitting gas, via a fixed ratio of AV,HII/AV,* = 1.86; if the true attenuation were much higher (about 4.4 magnitudes), the galaxies could lie back on the Kennicutt-Schmidt relation and the quench-before-deplete conclusion would fail.

Editorial extensions

If this is right

  • If these galaxies are truly quiescent, quenching can take place while a galaxy retains a molecular gas reservoir of 1–5 × 10^10 solar masses.
  • The CO-detected post-starbursts are offset from the Kennicutt-Schmidt relation by more than an order of magnitude in gas mass at a given star formation rate.
  • The elevated [N ii]/Hα ratios suggest that non-star-forming processes (AGN, shocks, or evolved stars) may dominate the residual emission, so even the low measured star formation rates could be overestimates.
  • Mechanisms that suppress star formation without removing gas, such as morphological quenching, are viable explanations for the observed state.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • One extension the paper leaves implicit: if confirmed with Balmer-decrement or far-infrared constraints, these galaxies would directly challenge the common assumption in cosmological simulations that star formation rate is tightly tied to molecular gas mass.
  • A testable next step is to search for dense gas tracers like HCN or HCO+ in these systems; if the gas is unable to form stars because it is kinematically disturbed or lacks dense cores, the offset from the Kennicutt-Schmidt relation would be explained.
  • The high [N ii]/Hα ratios could also be interpreted as evidence of a diffuse warm ionized medium rather than AGN activity, a distinction that spatially resolved spectroscopy could settle.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 4 minor

Summary. The paper presents Keck/NIRES rest-optical spectroscopy of 13 massive post-starburst galaxies at z~0.6 drawn from the SQuIGGLE sample, targeting the Hα region to obtain independent, more direct star formation rate measurements than the previous [O II]- or SED-based estimates. The authors detect Hα absorption in 11/13 targets and measure only weak line infilling, yielding dust-corrected SFRs below about 4 M_sun/yr for 12/13 objects, after excluding one AGN-dominated source. Comparing these SFRs with ALMA CO(2-1) molecular gas masses, they find that the five CO-detected galaxies have large H2 reservoirs (1-5e10 M_sun) but very low ongoing star formation, placing them more than an order of magnitude off the Kennicutt-Schmidt relation. The paper concludes that these galaxies have quenched before their cold gas reservoirs were depleted, and that the remaining molecular gas does not form stars efficiently.

Significance. If the result holds, it is an important observational constraint on the quenching process: it provides an independent Hα-based confirmation of low SFRs in gas-rich post-starburst galaxies, strengthening the case that massive galaxies can shut down star formation while retaining significant molecular gas. The paper's strengths include new Keck/NIRES data, Monte Carlo error propagation for all line measurements, a careful treatment of the known AGN in J1448+1010, and a candid discussion of the dust-correction caveat. The result directly tests the H2-to-star-formation connection assumed by many models and sharpens the tension with gas-removal-based quenching scenarios. The principal limitation is that the dust attenuation is not measured from Balmer lines for 12/13 objects, leaving a systematic uncertainty that is comparable in size to the claimed offset from the Kennicutt-Schmidt relation.

major comments (2)
  1. [§2.3 and §4] The central claim that the CO-detected galaxies are more than an order of magnitude offset from the Kennicutt-Schmidt relation rests on dust-corrected Hα SFRs, but the correction in §2.3 uses the SED-fitted stellar attenuation A_V,* converted to nebular attenuation with the fixed ratio A_V,HII/A_V,*=1.86 from Price et al. (2014). Because Hβ is not detected in 12/13 targets, no Balmer-decrement check is possible, and this ratio is a population average rather than a measurement for this sample. The authors themselves note in §4 that A_V,HII≈4.4 mag would place the gas-rich targets back on the Kennicutt-Schmidt relation, while the local PSB A_V,HII distribution from Yesuf & Ho (2020) extends to roughly 3 mag. The quoted SFRs are therefore not limited by the Monte Carlo errors in Table 1 but by an unquantified systematic floor. I request an explicit treatment of this systematic, ideally a stacked Balmer-decrement limit from the existing SDSS spectra (or a stacked Hβ upper limit), and a correspondingly qualified statement about how robust the 'quench before depletion' conclusion is to the adopted attenuation prior.
  2. [§2.3 and Figure 1] The measured Hα fluxes are small infilling fluxes superposed on strong stellar Balmer absorption, with typical EWs near 1 Å, and they are obtained after subtracting the FAST++ continuum model that is locally scaled to the NIRES spectra. The Monte Carlo errors in Table 1 account for random noise but not for systematic differences in continuum placement or template choice. Since the paper invokes the contrast between absorption and infilling to argue that residual star formation is minimal, I ask for a robustness test that quantifies this systematic, for example by repeating the fits with the Prospector continuum models or by varying the continuum anchor regions. Such a test would establish whether the low inferred SFRs are insensitive to template uncertainties.
minor comments (4)
  1. [Abstract] The phrase 'M_* ≳ ×10^11 M_sun' appears to contain a typo; it should likely read 'M_* ≳ 10^11 M_sun' or similar.
  2. [§4] The text in the discussion of dense gas tracers contains the duplicated word 'and and' in the sentence about future studies of higher-J CO transitions.
  3. [Figure 3] The caption states that CO-undetected targets are plotted as red stars and CO-detected targets as red stars with black edges, but the figure legend appears to use a different distinction; the caption and legend should be harmonized to avoid ambiguity.
  4. [Table 1 and §2.3] For the two non-detections, J0912+1523 and J1053+2342, the upper limits on Hα flux and SFR are 2σ limits, but the text in §3 refers to them as having 'no measurable Hα emission'; it would be clearer to state explicitly that these are 2σ upper limits in the main text as well.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: new NIRES Hα data independently confirm low SFRs; dust correction is a stated input, not a fitted prediction.

full rationale

The derivation chain is self-contained and does not reduce to its inputs by construction. The central new measurement is the Hα and [N II] flux from Keck/NIRES spectroscopy, an independent dataset not used in the BSS22 SFR estimates; the paper's Eq. (1) converts observed Hα luminosity to SFR, and no equation sets this Hα SFR equal to the SED-based SFR that is being confirmed. The dust correction in Sect. 2.3 uses A_V,* from FAST++ SED fitting as an input parameter, not as the predicted quantity, and the A_V,HII/A_V,* = 1.86 ratio is an externally adopted calibration (Price et al. 2014) with an explicit sensitivity test at ratio 3. The possibility of optically thick dust is openly quantified (A_V,HII = 4.4 mag would restore the Kennicutt-Schmidt relation), which shows the conclusion is not forced by the fitting procedure. Self-citations to BSS22, SQuIGGLE, and FAST++ provide the sample, gas masses, and continuum models, but the new Hα SFRs are not statistically forced to match those earlier values; they are compared to them. Any concern about the unverified dust correction is a systematic or correctness risk, not a circularity, because the Hα fluxes are new data and the correction is a stated assumption rather than a definitional identity.

Assumptions & free parameters 4 free parameters · 6 assumptions · 0 invented entities

The central claim rests on inherited calibrations and models from prior work: gas masses from BSS22 (alpha_CO = 4.0, r21 = 1.0), attenuation values from FAST++ SED fits (Setton et al. 2020), and the nebular-to-stellar attenuation ratio of 1.86 from Price et al. (2014). No new physical entities are introduced. Several of these inputs come from the same group's earlier papers, so the independence of the new Hα confirmation is partial rather than complete, though the line fluxes themselves are new data.

free parameters (4)
  • A_V,HII / A_V,* ratio = 1.86 (sensitivity test at 3.0)
    Adopted from Price et al. (2014) to convert stellar SED attenuation to nebular attenuation for the Hα dust correction; the paper tests a higher ratio and finds the conclusion unchanged.
  • Per-galaxy A_V,* from FAST++ SED fits = A_V,HII values 0.28 to 3.10 mag (Table 1)
    SED-derived stellar attenuation used to correct each Hα flux; with Hβ undetected in 12/13 galaxies, individual Balmer decrements are unavailable.
  • alpha_CO CO-to-H2 conversion factor = 4.0 M_sun / (K km/s pc^2)
    Adopted Milky Way-like conversion from BSS22; the inferred gas masses and the Kennicutt-Schmidt offset scale inversely with alpha_CO.
  • r21 CO(2-1)/CO(1-0) ratio = 1.0
    Assumed thermalized CO excitation when converting CO(2-1) to CO(1-0); the paper notes departures from this assumption would only increase the inferred gas masses.
assumptions (6)
  • domain assumption Calzetti et al. (2000) dust law with R_V = 4.05 applies to the HII regions of these galaxies
    Used to convert A_V to E(B-V) and to compute dust-corrected Hα luminosities (Sect. 2.3).
  • domain assumption The Kennicutt (1998) Hα-to-SFR calibration with a Chabrier IMF (via Muzzin et al. 2010) is valid
    Eq. (1) converts Hα luminosity to SFR assuming Case B recombination and a standard IMF; uncertain at the factor-of-two level.
  • domain assumption FAST++ (Setton et al. 2020) stellar continuum models reproduce the true stellar Hα absorption depth
    Infilling fluxes are measured by subtracting the FAST++ continuum; an overpredicted absorption depth would bias the inferred SFRs low (Sect. 2.2).
  • domain assumption The Kewley et al. (2001) and Fernandes et al. (2010) BPT demarcations apply at z ~ 0.6
    Used to classify the [N II]/Hα ratios as AGN or LI(N)ER-like (Sect. 3.2, Fig. 4).
  • domain assumption The SQuIGGLE color selection (Suess et al. 2022a) identifies genuine post-starburst galaxies
    All 13 targets are inherited from the parent sample; the U-B and B-V color selection produces the A-star signatures the analysis assumes.
  • domain assumption Milky Way-like alpha_CO = 4.0 is appropriate for these galaxies
    The H2 masses used in the Kennicutt-Schmidt comparison (Fig. 3) assume this; the authors argue against lower values because the galaxies are not highly star-forming or turbulent.

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Cite this review

Pith. "Pith review of SQuIGG$\vec{L}$E: Observational Evidence of Low Ongoing Star Formation Rates in Gas-Rich Post-Starburst Galaxies." pith.science (2026). https://pith.science/paper/F4OY2P4X

@misc{pith2026250116459,
  author       = {Pith},
  title        = {Pith review of: SQuIGG$\vecL$E: Observational Evidence of Low Ongoing Star Formation Rates in Gas-Rich Post-Starburst Galaxies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/F4OY2P4X}},
  note         = {Machine review of arXiv:2501.16459}
}
abstract

ALMA observations have shown that candidate "post-starburst" galaxies (PSBs) at z$\sim$0.6 can retain significant molecular gas reservoirs. These results would imply that -- unlike many model predictions -- galaxies can shut down their star formation before their cold gas reservoirs are depleted. However, these studies inferred star formation rates (SFRs) either from [O II] line fluxes or from spectral energy distribution modeling, and could have missed large dust-obscured contributions to the SFRs. In this study, we present Keck/NIRES observations of 13 massive ($\mathrm{M_*}\gtrsim \times 10^{11} \,\, \mathrm{M_\odot}$) PSBs, which allow us to estimate $\mathrm{H\alpha}$ SFRs in these gas-rich post-starburst galaxies. We confirm the previously inferred low SFRs for the majority of the sample: 11/13 targets show clear $\mathrm{H\alpha}$ absorption, with minimal infilling indicating dust-corrected SFRs of $<4.1 \,\mathrm{M_\odot\, yr^{-1}}$. These SFRs are notably low given the large $\mathrm{H_2}$ reservoirs ($\sim 1-5 \times 10^{10} \,\, \mathrm{M_\odot}$) present in 5/13 of these galaxies, placing them significantly offset from star-forming galaxies on the Kennicutt-Schmidt relation for star-forming galaxies. The [N II]/H$\alpha$ ratios of all 13 PSBs imply contributions from non-star-forming ionization mechanisms (e.g., AGN, shocks, or hot evolved stars) to their $\mathrm{H\alpha}$ emission, suggesting that even these low ongoing SFRs may be overestimated. These low $\mathrm{H\alpha}$ SFRs, dust-corrected using A$_v$ estimates from SED fitting, confirm that these galaxies are very likely quiescent and, thus, that galaxies can quench before their cold gas reservoirs are fully depleted.

Figures

Figures reproduced from arXiv: 2501.16459 by the authors.

Figure 1
Figure 1. Keck/NIRES spectra of all SQuIGGL⃗E PSBs in the Hα region. The panels in the odd-numbered columns display the FAST++ modeled continuum in green and the spectra in black; the grey-shaded area represents the noise. The target’s SDSS ID and redshift are labeled in the corner. The vertical dashed blue lines mark the Hα wavelength in vacuum (6564.6 ˚A). Each panel in the even-numbered columns illustrates the target’s emi… view at source ↗
Figure 2
Figure 2. Comparison between the SED SFRs measured by BSS22, and the Hα SFRs calculated here. The SFR mea￾surements from both studies are generally in good agreement except for J1448+1010, which possesses a broad and intense Hα emission line indicating an AGN. In [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 4
Figure 4. shows the SQuIGGL⃗E PSBs on the BPT diagram, with the SDSS DR7 (Abazajian et al. 2009) −1.0 −0.5 0.0 0.5 1.0 log ([NII]/Hα) −1.0 −0.5 0.0 0.5 1.0 1.5 log ([OIII]/H β ) AGN LI(N)ER SF [OIII] or Hβ detected ( J1448+1010 (AGN) +CO-detected) 0.0 0.5 Normalized Counts SDSS DR7 [OIII] or Hβ detected [OIII] and Hβ undetected [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figures from the paper (1 more)
Figure 3
Figure 3. Figure 3: The SFR vs. H2 gas mass for SQuIGGL⃗E PSBs. The CO-detected targets are plotted as red stars with black edges, and the CO-undetected samples are plot￾ted as red stars. Comparative samples of massive galax￾ies from COLDGASS at z ∼ 0 (Saintonge et al. 2011a,b), star-form…

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