Skip to content
Back to outputs

Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies

Research output: Contribution to journalArticlepeer-review

Standard

Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies. / Thomas, D.; Greggio, L.; Bender, R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 302, No. 3, 21.01.1999, p. 537-548.

Research output: Contribution to journalArticlepeer-review

Harvard

Thomas, D, Greggio, L & Bender, R 1999, 'Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies', Monthly Notices of the Royal Astronomical Society, vol. 302, no. 3, pp. 537-548. https://doi.org/10.1046/j.1365-8711.1999.02138.x

APA

Thomas, D., Greggio, L., & Bender, R. (1999). Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies. Monthly Notices of the Royal Astronomical Society, 302(3), 537-548. https://doi.org/10.1046/j.1365-8711.1999.02138.x

Vancouver

Thomas D, Greggio L, Bender R. Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies. Monthly Notices of the Royal Astronomical Society. 1999 Jan 21;302(3):537-548. https://doi.org/10.1046/j.1365-8711.1999.02138.x

Author

Thomas, D. ; Greggio, L. ; Bender, R. / Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies. In: Monthly Notices of the Royal Astronomical Society. 1999 ; Vol. 302, No. 3. pp. 537-548.

Bibtex

@article{3ba853f2aa154749a2b018aac64f01a1,
title = "Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies",
abstract = "We explore the formation of α-enhanced and metal-rich stellar populations in the nuclei of luminous ellipticals under the assumption of two extreme galaxy formation scenarios based on hierarchical clustering, namely a fast clumpy collapse and the merger of two spirals. We investigate the parameter space of the star formation time-scale, the slope of the initial mass function (IMF) and stellar yields. In particular, the latter add a huge uncertainty in constraining time-scales and IMF slopes. We find that—for Thielemann, Nomoto & Hashimoto nucleosynthesis—in a fast clumpy collapse scenario an [α/Fe] overabundance of ∼ 0.2 dex in the high-metallicity stars can be achieved with a Salpeter IMF and star formation time-scales of the order 109 yr. The scenario of two merging spirals that are similar to our Galaxy, instead, fails to reproduce the α-enhanced abundance ratios in the metal-rich stars, unless the IMF is flattened during the burst ignited by the merger. This result is independent of the burst time-scale. We suggest that abundance gradients give hints to distinguish between the two extreme formation scenarios considered in this paper. ",
keywords = "galaxies : elliptical and lenticular, cD, galaxies : formation, galaxies : luminosity function, mass function, galaxies : stellar content",
author = "D. Thomas and L. Greggio and R. Bender",
year = "1999",
month = jan,
day = "21",
doi = "10.1046/j.1365-8711.1999.02138.x",
language = "English",
volume = "302",
pages = "537--548",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

RIS

TY - JOUR

T1 - Constraints on galaxy formation from α-enhancement in luminous elliptical galaxies

AU - Thomas, D.

AU - Greggio, L.

AU - Bender, R.

PY - 1999/1/21

Y1 - 1999/1/21

N2 - We explore the formation of α-enhanced and metal-rich stellar populations in the nuclei of luminous ellipticals under the assumption of two extreme galaxy formation scenarios based on hierarchical clustering, namely a fast clumpy collapse and the merger of two spirals. We investigate the parameter space of the star formation time-scale, the slope of the initial mass function (IMF) and stellar yields. In particular, the latter add a huge uncertainty in constraining time-scales and IMF slopes. We find that—for Thielemann, Nomoto & Hashimoto nucleosynthesis—in a fast clumpy collapse scenario an [α/Fe] overabundance of ∼ 0.2 dex in the high-metallicity stars can be achieved with a Salpeter IMF and star formation time-scales of the order 109 yr. The scenario of two merging spirals that are similar to our Galaxy, instead, fails to reproduce the α-enhanced abundance ratios in the metal-rich stars, unless the IMF is flattened during the burst ignited by the merger. This result is independent of the burst time-scale. We suggest that abundance gradients give hints to distinguish between the two extreme formation scenarios considered in this paper.

AB - We explore the formation of α-enhanced and metal-rich stellar populations in the nuclei of luminous ellipticals under the assumption of two extreme galaxy formation scenarios based on hierarchical clustering, namely a fast clumpy collapse and the merger of two spirals. We investigate the parameter space of the star formation time-scale, the slope of the initial mass function (IMF) and stellar yields. In particular, the latter add a huge uncertainty in constraining time-scales and IMF slopes. We find that—for Thielemann, Nomoto & Hashimoto nucleosynthesis—in a fast clumpy collapse scenario an [α/Fe] overabundance of ∼ 0.2 dex in the high-metallicity stars can be achieved with a Salpeter IMF and star formation time-scales of the order 109 yr. The scenario of two merging spirals that are similar to our Galaxy, instead, fails to reproduce the α-enhanced abundance ratios in the metal-rich stars, unless the IMF is flattened during the burst ignited by the merger. This result is independent of the burst time-scale. We suggest that abundance gradients give hints to distinguish between the two extreme formation scenarios considered in this paper.

KW - galaxies : elliptical and lenticular, cD

KW - galaxies : formation

KW - galaxies : luminosity function, mass function

KW - galaxies : stellar content

U2 - 10.1046/j.1365-8711.1999.02138.x

DO - 10.1046/j.1365-8711.1999.02138.x

M3 - Article

VL - 302

SP - 537

EP - 548

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 3

ER -

ID: 1795825