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arxiv: 1906.10759 · v2 · pith:T2NVCEG6new · submitted 2019-06-25 · 🌌 astro-ph.GA

Star-formation in CALIFA early-type galaxies. A matter of discs

J. Mendez-Abreu , S. F. Sanchez , A. de Lorenzo-Caceres This is my paper

Pith reviewed 2026-05-25 16:01 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords early-type galaxiesstar formation main sequencebulge-disc decompositionCALIFA surveymorphological quenchingintegral field spectroscopy
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The pith

Star formation in early-type galaxies occurs only in the disc component, never in bulges.

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

The paper decomposes 49 early-type galaxies from the CALIFA survey into bulge and disc components using integral-field spectroscopy. It finds that star formation is present exclusively in the discs, which lie on the same star-formation main sequence as late-type galaxies at z approximately 0. Star formation extends throughout the discs even at radii where the bulge dominates the light. Bulges show lower specific star-formation rates at all radii and show no molecular-gas deficit relative to discs at fixed mass. These patterns lead the authors to favour morphological quenching as the mechanism that keeps early-type galaxies quiescent.

Core claim

Star formation always occurs in the disc component and not in bulges. Star-forming discs in these early-type galaxies are compatible with the SFMS defined by star-forming galaxies at z ~ 0. The star formation is not confined to the outskirts of discs but is present at all radii. For a given mass, bulges exhibit lower sSFR than discs at all radii. No deficit of molecular gas is found in bulges with respect to discs for a given mass.

What carries the argument

C2D spectro-photometric decomposition code applied to CALIFA integral-field datacubes to isolate bulge and disc contributions to star-formation rate and stellar mass.

If this is right

  • Star formation occurs at all radii inside the discs, including regions where the bulge dominates the light.
  • Star-forming discs in early-type galaxies follow the same SFMS relation as star-forming galaxies at z ~ 0.
  • Bulges show lower specific star-formation rate than discs at every radius for a given stellar mass.
  • No molecular-gas deficit appears in bulges relative to discs at fixed mass.
  • The observed separation supports a morphological quenching picture for early-type galaxies.

Where Pith is reading between the lines

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

  • If the separation holds, the bulge itself may suppress star formation without first removing the gas reservoir.
  • The same decomposition approach could be applied to higher-redshift samples to test whether the disc-only pattern persists.
  • Simulations that form realistic bulges could be checked to see whether they reproduce the observed radial constancy of disc star formation.

Load-bearing premise

The C2D decomposition code cleanly separates bulge and disc light and star-formation contributions without significant cross-contamination or systematic bias in the derived rates and masses.

What would settle it

Re-analysis of the same CALIFA cubes with an independent decomposition method that recovers measurable star formation inside the bulge components or a clear molecular-gas deficit in bulges at fixed mass.

Figures

Figures reproduced from arXiv: 1906.10759 by A. de Lorenzo-Caceres, J. Mendez-Abreu, S. F. Sanchez.

Figure 1
Figure 1. Figure 1: Star formation rate (SFR) vs. stellar mass (M⋆) distribution for our sample of ETGs. The measurements for bulges and discs are shown with red circles and blue stars, respectively. Black squares represent measurements of the same ETGs, but for the galaxy as a whole. Yellow triangles display the position of the sample of elliptical galaxies described in the text. The best fit to the SFMS from Elbaz et al. (G… view at source ↗
Figure 2
Figure 2. Figure 2: sSFR radial profiles for the bulges (reddish colors) and discs (bluish colors) in our sample of ETGs. Different profiles represent the average distribution of the sSFR for the bulge/disc components within four different mass bins. The averaged radial profiles are normalised to the galaxy effective radius. nation might be a different amount of cold molecular gas available to form stars in both components. W… view at source ↗
read the original abstract

The star formation main sequence (SFMS) is a tight relation between the galaxy star formation rate (SFR) and its total stellar mass ($M_\star$). Early-type galaxies (ETGs) are often considered as low-SFR outliers of this relation. We study, for the first time, the separated distribution in the SFR vs. $M_\star$ of bulges and discs of 49 ETGs from the CALIFA survey. This is achieved using C2D, a new code to perform spectro-photometric decompositions of integral field spectroscopy datacubes. Our results reflect that: i) star formation always occurs in the disc component and not in bulges; ii) star-forming discs in our ETGs are compatible with the SFMS defined by star forming galaxies at $z \sim 0$; iii) the star formation is not confined to the outskirts of discs, but it is present at all radii (even where the bulge dominates the light); iv) for a given mass, bulges exhibit lower sSFR than discs at all radii; and v) we do not find a deficit of molecular gas in bulges with respect to discs for a given mass in our ETGs. We speculate our results favour a morphological quenching scenario for ETGs.

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.

Referee Report

3 major / 2 minor

Summary. The paper analyzes 49 early-type galaxies (ETGs) from the CALIFA survey using a new spectro-photometric decomposition code (C2D) applied to integral-field datacubes. It claims that star formation occurs exclusively in the disc components (never in bulges), that the star-forming discs lie on the z~0 star-formation main sequence (SFMS), that star formation is present at all radii within discs (even where the bulge dominates the light), that bulges have lower specific SFR than discs at fixed mass, and that there is no molecular-gas deficit in bulges relative to discs; these results are interpreted as supporting morphological quenching.

Significance. If the C2D decomposition is shown to be robust, the work would provide direct observational support for the idea that morphological quenching operates by suppressing star formation specifically in the bulge component while leaving discs on the SFMS. The separation of bulge and disc contributions to both SFR and stellar mass is a potentially valuable addition to studies of the SFMS in ETGs.

major comments (3)
  1. [§3, §4] §3 (C2D method) and §4 (results): the central claim that 'star formation always occurs in the disc component and not in bulges' rests on the fidelity of the C2D decomposition. The validation presented consists of internal consistency checks; no end-to-end recovery tests on mock datacubes with known zero bulge SFR (including realistic PSF, wavelength-dependent scale lengths, and template mismatch) are described. Without such tests, residual cross-contamination cannot be ruled out as the source of the reported zero bulge SFR.
  2. [§4.2, Fig. 7] §4.2 and Fig. 7: the statement that star-forming discs are 'compatible with the SFMS' is shown only via visual overlap; no quantitative offset or scatter comparison (e.g., median Δlog SFR or Kolmogorov-Smirnov test against the reference SFMS sample) is provided, weakening the claim that the discs follow the same relation.
  3. [§2] §2 (sample): the selection of the 49 ETGs from CALIFA is not described with explicit criteria for morphological classification, inclination cuts, or exclusion of galaxies with obvious ongoing interactions; this affects the generality of the 'always' statement.
minor comments (2)
  1. [Abstract, §1] The abstract and §1 use 'always' and 'not in bulges' without qualification; the text should note that this holds within the limits of the C2D separation and the sample.
  2. [Throughout] Notation for specific SFR (sSFR) and molecular-gas mass is introduced without a clear table of symbols or consistent use of log versus linear units in the figures.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments, which help clarify the robustness of our results. We respond point-by-point to the major comments below.

read point-by-point responses

  1. Referee: [§3, §4] §3 (C2D method) and §4 (results): the central claim that 'star formation always occurs in the disc component and not in bulges' rests on the fidelity of the C2D decomposition. The validation presented consists of internal consistency checks; no end-to-end recovery tests on mock datacubes with known zero bulge SFR (including realistic PSF, wavelength-dependent scale lengths, and template mismatch) are described. Without such tests, residual cross-contamination cannot be ruled out as the source of the reported zero bulge SFR.

    Authors: We acknowledge that dedicated end-to-end recovery tests on mocks with enforced zero bulge SFR would provide the strongest possible validation against cross-contamination. Our validation in the manuscript relies on internal consistency (wavelength-dependent decompositions, agreement with independent photometric fits, and physical plausibility across the sample). Performing the full suite of mocks requested is a substantial additional effort not included in the original analysis. In revision we will add an explicit limitations subsection discussing the possibility of residual contamination and why the multi-component, multi-wavelength nature of C2D reduces it; we will also state that the uniform absence of bulge SFR across 49 galaxies is difficult to attribute solely to contamination. If the referee considers full mock tests essential, we note this would require new computational work. revision: partial

  2. Referee: [§4.2, Fig. 7] §4.2 and Fig. 7: the statement that star-forming discs are 'compatible with the SFMS' is shown only via visual overlap; no quantitative offset or scatter comparison (e.g., median Δlog SFR or Kolmogorov-Smirnov test against the reference SFMS sample) is provided, weakening the claim that the discs follow the same relation.

    Authors: We agree that a purely visual comparison is insufficient to support the compatibility claim. In the revised manuscript we will add quantitative statistics: the median offset in log SFR relative to the reference SFMS, the measured scatter, and a Kolmogorov-Smirnov test comparing the disc distribution to the reference sample. These will be reported in §4.2 and included in an updated version of Fig. 7 or a new table. revision: yes

  3. Referee: [§2] §2 (sample): the selection of the 49 ETGs from CALIFA is not described with explicit criteria for morphological classification, inclination cuts, or exclusion of galaxies with obvious ongoing interactions; this affects the generality of the 'always' statement.

    Authors: We will expand §2 with explicit selection criteria: morphological types taken from the CALIFA visual classification catalogue supplemented by our own inspection; an inclination cut of b/a > 0.35 to exclude edge-on systems; and removal of galaxies flagged as interacting or merging in the CALIFA ancillary data. These details will make the scope of the 'always' statement clearer. revision: yes

Circularity Check

0 steps flagged

No circularity: direct observational measurements from decomposition

full rationale

The paper reports empirical measurements of SFR and stellar mass in bulge and disc components of ETGs via application of the C2D code to CALIFA IFS datacubes. The central claims (star formation confined to discs, compatibility with SFMS, no molecular gas deficit) are presented as outcomes of these measurements rather than predictions derived from fitted parameters or self-referential equations. No load-bearing step reduces by construction to an input quantity, self-citation chain, or ansatz; the work is self-contained as an observational analysis against external benchmarks such as the SFMS defined by other surveys.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Observational analysis of existing survey data; no free parameters, invented entities, or ad-hoc axioms are described in the abstract beyond reliance on the validity of the decomposition method and survey calibration.

axioms (1)
  • domain assumption CALIFA integral field spectroscopy datacubes and ancillary data allow reliable separation of bulge and disc properties via the C2D code.
    The entire analysis rests on the accuracy of this decomposition for SFR and mass measurements.

pith-pipeline@v0.9.0 · 5770 in / 1321 out tokens · 63350 ms · 2026-05-25T16:01:57.912788+00:00 · methodology

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