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Küntschner, H.

doi:10.1023/a:1017525223856

Cited by 22 publications

(39 citation statements)

References 9 publications

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“…We find that galaxies with younger central age have a higher central metal content, which implies that the young stars are formed out of pre‐enriched gas. Jørgensen (1999), Poggianti et al (2001) and Thomas et al (2005) observe a similar trend in their data sample of early‐type galaxies, although Kuntschner (2001) argues that the observed age–metallicity anti‐correlation is more likely to be an artefact caused by errors due to the well‐known age–metallicity degeneracy (Worthey 1994).…”

Section: Galaxy Propertiesmentioning

confidence: 79%

“…In the literature, the existence of an age 0 –log(σ 0 ) relation is still under debate. Jørgensen (1999), Kuntschner (2001), Mehlert et al (2003) and Sánchez‐Blázquez et al (2006b) (high‐density environment galaxies) report a lack of trend in their samples, whereas Poggianti et al (2001), Caldwell, Rose & Concannon (2003), Thomas et al (2005), Nelan et al (2005), Bernardi et al (2006), Smith et al (2006), Sánchez‐Blázquez et al (2006b) (low‐density environment galaxies), Annibali et al (2007) and Graves et al (2007) claim a clear correlation between the two parameters. Nelan et al (2005) claim a steepen of the relation for galaxies with central stellar velocity dispersion values less than log(σ 0 ) ∼ 2.1.…”

Section: Galaxy Propertiesmentioning

confidence: 97%

“…In the literature, the existence of an age 0 -log(σ 0 ) relation is still under debate. Jørgensen (1999), Kuntschner (2001), Mehlert et al (2003) . Stellar population gradients of our sample galaxies.…”

Section: Central and Mean Stellar Population Propertiesmentioning

confidence: 99%

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Early-type galaxies at large galactocentric radii - II. Metallicity gradients and the [Z/H]-mass, [α/Fe]-mass relations

Spolaor¹,

Kobayashi²,

Forbes³

et al. 2010

Monthly Notices of the Royal Astronomical Society

143

175

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We present the results of a study of stellar population properties at large galactocentric radii of 14 low‐mass early‐type galaxies in the Fornax and Virgo clusters. We derive radial profiles of age, total metallicity [Z/H] and [α/Fe] abundance ratios out to ∼1–3 effective radii by using nearly all of the Lick/IDS absorption‐line indices in comparison to recent single stellar population models. We extend our study to higher galaxy mass via a novel literature compilation of 37 early‐type galaxies, which provides stellar population properties out to one effective radius. We find that metallicity gradients correlate with galactic mass, and the relationship shows a sharp change in slope at a dynamical mass of ∼3.5 × 1010 M⊙. The central and mean values of the stellar population parameters (measured in r≤re/8 and at r=re, respectively) define positive mass trends. We suggest that the low metallicities, almost solar [α/Fe] ratios and the tight mass–metallicity gradient relation displayed by the low‐mass galaxies are indicative of an early star‐forming collapse with extended (i.e. ≥1 Gyr), low‐efficiency star formation, and mass‐dependent galactic outflows of metal‐enriched gas. The flattening of metallicity gradients in high‐mass galaxies and the broad scatter of the relationship are attributed to merger events. The high metallicities and supersolar abundances shown by these galaxies imply a rapid, high efficiency star formation. The observed [Z/H]–mass and [α/Fe]–mass relationships can be interpreted as a natural outcome of an early star‐forming collapse. However, we find that hierarchical galaxy formation models implementing mass‐dependent star formation efficiency, varying initial mass function, energy feedback via active galactic nucleus and the effects due to merger‐induced starbursts can also reproduce both our observed relationships.

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Section: Galaxy Propertiesmentioning

confidence: 79%

Section: Galaxy Propertiesmentioning

confidence: 97%

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Early-type galaxies at large galactocentric radii - II. Metallicity gradients and the [Z/H]-mass, [α/Fe]-mass relations

Spolaor¹,

Kobayashi²,

Forbes³

et al. 2010

Monthly Notices of the Royal Astronomical Society

143

175

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show abstract

“…The indexindex planes are customarily used to infer age and metallicity of early-type galaxies (González 1993;Bressan et al 1996;Trager et al 2000a,b;Kuntschner 2000Kuntschner , 2001. In Fig.…”

Section: Mean Narrow Band Indices For Galaxiesmentioning

confidence: 99%

Enhancement ofα-elements in dynamical models of elliptical galaxies

Tantalo

Chiosi

2002

A&A

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“…In particular quiescent, elliptical galaxies follow tight relations, such as the color-magnitude relation and the relation between absorption index strengths and velocity dispersion, originating from the increase of their light-weighted age, stellar metallicity and element abundance ratio with galaxy mass (e.g. Trager et al 2000;Kuntschner 2001; Thomas et al 2005;Nelan et al 2005;Gallazzi et al 2006;Graves et al 2009a). This indicates that the stars in present-day more massive ellipticals have reached a higher degree of chemical enrichment and have formed earlier and on shorter timescales than less massive galaxies.…”

Section: Introductionmentioning

confidence: 99%

Charting the evolution of the ages and metallicities of massive galaxies since z = 0.7

et al. 2011

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Abstract. Detailed studies of the stellar populations of intermediate-redshift galaxies can shed light onto the processes responsible for the significant evolution of the massive galaxy population since z < 1. We have undertaken such a study by means of deep rest-frame optical spectroscopy with IMACS on Magellan on a sample of ∼80 galaxies selected from CDFS to have stellar masses > 10 10 M and redshift 0.65 < z < 0.75. We analyse stellar absorption line strengths and interpret them with a Monte Carlo library of star formation histories to derive constraints on mean stellar ages, metallicities and stellar masses. We present here the first characterization of the stellar mass-metallicity and stellar mass-age relations at z∼0.7 and their evolution to the present-day.

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Untitled

Cited by 22 publications

References 9 publications

Early-type galaxies at large galactocentric radii - II. Metallicity gradients and the [Z/H]-mass, [α/Fe]-mass relations

Early-type galaxies at large galactocentric radii - II. Metallicity gradients and the [Z/H]-mass, [α/Fe]-mass relations

Enhancement ofα-elements in dynamical models of elliptical galaxies

Charting the evolution of the ages and metallicities of massive galaxies since z = 0.7

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