Les statues honorifiques entre texte et image

Queyrel, François

doi:10.4000/pallas.1383

Cited by 10 publications

(13 citation statements)

References 1 publication

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“…The finding of Cresci et al (2010) of a positive/inverted d[Fe/H]/dR gradient at high redshift can also be linked to the finding of Queyrel et al (2012), who found positive gradients using nitrogen and oxygen emission lines in two isolated and apparently quiescent galaxies, which cannot relate to the strong gradient changes expected in mergers (Rupke et al 2010). Stott et al (2014) find a similar picture, where metallicity gradients tend to be inverted or very small in galaxies with a high specific star formation rate.…”

Section: Introductionmentioning

confidence: 84%

Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation

Schönrich

McMillan

2017

Mon. Not. R. Astron. Soc.

101

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The early stages of a galaxy's evolution leave an imprint on its metallicity distribution. We discuss the origins and evolution of radial metallicity gradients in discs of spiral galaxies using an analytical chemical evolution model. We explain how radial metallicity gradients in stellar populations are determined by three factors: the radial metallicity profile of the star-forming ISM, radial changes in the star-formation history (in particular inside-out formation), and radial mixing of stars. Under reasonable assumptions, inside-out formation steepens the negative ISM metallicity gradient, but contributes positively to the stellar metallicity gradient, up to inverting the metallicity profile to a positive d[Fe/H]/dR. This reconciles steep negative d[Fe/H]/dR in some high redshift galaxies to generally flatter gradients in local observations.We discuss the evidence for inverse radial metallicity gradients (positive d[X/H]/dR) at high redshifts and the inverse relationship between azimuthal velocity and the metallicity (positive dV φ /d[Fe/H]) of stars for the Milky Way's thick disc. The former can be achieved by high central gas-loss rates and re-distribution processes, e.g. re-accretion of enriched material in conjunction with inside-out formation, and neardisc galactic fountaining. For the Milky Way thick disc, we show that the positive dV φ /d[Fe/H] correlation points to comparable timescales for inside-out formation, initial metal enrichment and SNIa enrichment. We argue that the original ISM metallicity gradient could be inferred with better data from the high-metallicity tail of the alpha enhanced population. Including inside-out formation in our models changes the local vertical metallicity gradient by about −0.2 dex/ kpc, in line with local measurements.

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Section: Introductionmentioning

confidence: 84%

Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation

Schönrich

McMillan

2017

Mon. Not. R. Astron. Soc.

101

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“…Overall, our observations suggest a mixture of both positive (inverted) and negative metallicity gradients. The inverted gradients are interesting, since such gradients have been suggested as evidence of inflowing metal-poor gas at high redshift (e.g., Cresci et al 2010;Queyrel et al 2012). Indeed, Queyrel et al (2012) have suggested that such inverted gradients may be found in metal-poor galaxies.…”

Section: Element Abundances and Abundance Gradientsmentioning

confidence: 93%

Probing Structure in Cold Gas at z ≲ 1 with Gravitationally Lensed Quasar Sight Lines

Kulkarni

Cashman

López

et al. 2019

ApJ

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“…We do not see indications of decreasing metallicity with increasing distance from the centre of the galaxy. This is surprising given that metallicity gradients are known to occur in various types of galaxies (Swinbank et al 2012;Queyrel et al 2012) and can be seen as a further evidence the gas probed in absorption might be tracing gas flows outside the galaxy's halo. We note that these measurements correspond to the absolute metallicity of the absorbing gas, independent of the emission-line metallicity of the associated galaxy.…”

Section: Global Properties Of the Sinfoni Surveymentioning

confidence: 98%

A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems – VI. Metallicity and geometry as gas flow probes

Péroux

Quiret

Rahmani

et al. 2016

Mon. Not. R. Astron. Soc.

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The use of background quasars provides a powerful tool to probe the cool gas in the circum-galactic medium of foreground galaxies. Here, we present new observations with SINFONI and X-Shooter of absorbing-galaxy candidates at z=0.7-1. We report the detection with both instruments of the Hα emission line of one sub-DLA at z abs =0.94187 with log N (H I)=19.38 +0.10 −0.15 towards SDSS J002133.27+004300.9. We estimate the star formation rate: SFR=3.6±2.2 M /yr in that system. A detailed kinematic study indicates a dynamical mass M dyn =10 9.9±0.4 M and a halo mass M halo =10 11.9±0.5 M . In addition, we report the [O ii] detection with X-Shooter of another DLA at z abs =0.7402 with log N (H I)=20.4±0.1 toward Q0052+0041 and an estimated SFR of 5.3±0.7 M /yr. Three other objects are detected in the continuum with X-Shooter but the nature and redshift of two of these objects are unconstrained due to the absence of emission lines, while the third object might be at the redshift of the quasar. We use the objects detected in our whole N (H I)-selected SINFONI survey to compute the metallicity difference between the galaxy and the absorbing gas, δ HI (X), where a positive (negative) value indicates infall (outflow). We compare this quantity with the quasar line of sight alignment with the galaxy's major (minor) axis, another tracer of infall (outflow). We find that these quantities do not correlate as expected from simple assumptions. Additional observations are necessary to relate these two independent probes of gas flows around galaxies.

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Les statues honorifiques entre texte et image

Cited by 10 publications

References 1 publication

Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation

Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation

Probing Structure in Cold Gas at z ≲ 1 with Gravitationally Lensed Quasar Sight Lines

A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems – VI. Metallicity and geometry as gas flow probes

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