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The ATLAS3D Project - XXVIII. Dynamically-driven star formation suppression in early-type galaxies
Astrophysics of Galaxies · Submitted 19 Mar 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This leads us to suggest that dynamical properties (such as shear or the global stability of the gas) may be important second parameters that regulate star formation and cause much of the scatter around star-formation relations.
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The abstract, sentence by sentence
We present measurements of the star formation rate (SFR) in the early-type galaxies (ETGs) of the ATLAS3D sample, based on Wide-field Infrared Survey Explorer (WISE) 22um and Galaxy Evolution Explorer (GALEX) far-ultraviolet emission. We combine these with gas masses estimated from 12CO and HI data in order to investigate the star formation efficiency (SFE) in a larger sample of ETGs than previously available. We first recalibrate (based on WISE data) the relation between old stellar populations (traced at Ks-band) and 22um luminosity, allowing us to remove the contribution of 22um emission from circumstellar dust. We then go on to investigate the position of ETGs on the Kennicutt-Schmidt (KS) relation. Molecular gas-rich ETGs have comparable star formation surface densities to normal spiral galaxy centres, but they lie systematically offset from the KS relation, having lower star formation efficiencies by a factor of ~2.5 (in agreement with other authors). This effect is driven by galaxies where a substantial fraction of the molecular material is in the rising part of the rotation curve, and shear is high. We show here for the first time that although the number of stars formed per unit gas mass per unit time is lower in ETGs, it seems that the amount of stars formed per free-fall time is approximately constant. The scatter around this dynamical relation still correlates with galaxy properties such as the shape of the potential in the inner regions. This leads us to suggest that dynamical properties (such as shear or the global stability of the gas) may be important second parameters that regulate star formation and cause much of the scatter around star-formation relations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present measurements of the star formation rate (SFR) in the early-type galaxies (ETGs) of the ATLAS3D sample, based on Wide-field Infrared Survey Explorer (WISE) 22um and Galaxy Evolution Explorer (GALEX) far-ultraviolet emission. | contribution 0.84 | 0.97 | 0.02 | asserted 1.00 |
| s1 | We combine these with gas masses estimated from 12CO and HI data in order to investigate the star formation efficiency (SFE) in a larger sample of ETGs than previously available. | method 0.62 | 0.94 | 0.03 | asserted 0.89 |
| s2 | We first recalibrate (based on WISE data) the relation between old stellar populations (traced at Ks-band) and 22um luminosity, allowing us to remove the contribution of 22um emission from circumstellar dust. | method 0.98 | 0.94 | 0.02 | asserted 1.00 |
| s3 | We then go on to investigate the position of ETGs on the Kennicutt-Schmidt (KS) relation. | method 0.51 | 0.78 | 0.02 | unclear 0.71 |
| s4 | Molecular gas-rich ETGs have comparable star formation surface densities to normal spiral galaxy centres, but they lie systematically offset from the KS relation, having lower star formation efficiencies by a factor of ~2.5 (in agreement with other authors). | result 1.00 | 0.84 | 0.24 | asserted 1.00 |
| s5 | This effect is driven by galaxies where a substantial fraction of the molecular material is in the rising part of the rotation curve, and shear is high. | interpretation 0.62 | 0.79 | 0.19 | asserted 1.00 |
| s6 | We show here for the first time that although the number of stars formed per unit gas mass per unit time is lower in ETGs, it seems that the amount of stars formed per free-fall time is approximately constant. | result 0.91 | 0.93 | 0.40 | asserted 0.75 |
| s7 | The scatter around this dynamical relation still correlates with galaxy properties such as the shape of the potential in the inner regions. | result 0.98 | 0.91 | 0.10 | asserted 1.00 |
| s8 | This leads us to suggest that dynamical properties (such as shear or the global stability of the gas) may be important second parameters that regulate star formation and cause much of the scatter around star-formation relations. | interpretation 1.00 | 0.48 | 0.77 | hedged possibility 1.00 |
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The paper
Original abstract
We present measurements of the star formation rate (SFR) in the early-type galaxies (ETGs) of the ATLAS3D sample, based on Wide-field Infrared Survey Explorer (WISE) 22um and Galaxy Evolution Explorer (GALEX) far-ultraviolet emission. We combine these with gas masses estimated from 12CO and HI data in order to investigate the star formation efficiency (SFE) in a larger sample of ETGs than previously available. We first recalibrate (based on WISE data) the relation between old stellar populations (traced at Ks-band) and 22um luminosity, allowing us to remove the contribution of 22um emission from circumstellar dust. We then go on to investigate the position of ETGs on the Kennicutt-Schmidt (KS) relation. Molecular gas-rich ETGs have comparable star formation surface densities to normal spiral galaxy centres, but they lie systematically offset from the KS relation, having lower star formation efficiencies by a factor of ~2.5 (in agreement with other authors). This effect is driven by galaxies where a substantial fraction of the molecular material is in the rising part of the rotation curve, and shear is high. We show here for the first time that although the number of stars formed per unit gas mass per unit time is lower in ETGs, it seems that the amount of stars formed per free-fall time is approximately constant. The scatter around this dynamical relation still correlates with galaxy properties such as the shape of the potential in the inner regions. This leads us to suggest that dynamical properties (such as shear or the global stability of the gas) may be important second parameters that regulate star formation and cause much of the scatter around star-formation relations.
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References
How later papers used it
57 later papers cite it
2 papers by the same authors are listed below: 1 used its method or tool and 2 used its data or values. 1 of them appears under more than one label.
Uses its method or tool 1 paper · 1 by the same authors
By the same authors
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Used the relation between the 2MASS Ks-band luminosity and the WISE 22 micron luminosity from this paper to estimate the portion of the mid-infrared emission produced by old, passively evolving stars.
Star Formation in Nearby Early-Type Galaxies: The Radio Continuum Perspective (2016) (same authors) · 0.92 · paraphrased: the licence does not allow quoting
Uses its data or values 2 of 9 papers with this label · 2 by the same authors
By the same authors
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Took the star formation rate and total cold gas mass for each candidate star-forming early-type galaxy from Table 1 of this paper.
Star Formation in Nearby Early-Type Galaxies: The Radio Continuum Perspective (2016) (same authors) · 1.00 · paraphrased: the licence does not allow quoting
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Used its star formation rate from this paper to give a gas consumption time of 1 to 2 Gyr.
The Diversity of Atomic Hydrogen in Slow Rotator Early-type Galaxies (2018) (same authors) · 0.93 · paraphrased: the licence does not allow quoting
How the literature uses it
3 arXiv papers cite this in 6 sentences
Papers citing it · 5 sentences without a confident label
Uses its data or values 1 paper
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We test the existence of a correlation between $α_G,S$ and SFR using ATLAS$^3D$ and the measured SFRs presented by [ref] .
The origin of the atomic and molecular gas contents of early-type galaxies. II. Misaligned gas accretion · Dependence on galaxy properties · 1.00
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