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New clues on the calcium underabundance in early-type galaxies

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New clues on the calcium underabundance in early-type galaxies. / Thomas, D.; Maraston, C.; Bender, R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 343, No. 1, 07.2003, p. 279-283.

Research output: Contribution to journalArticlepeer-review

Harvard

Thomas, D, Maraston, C & Bender, R 2003, 'New clues on the calcium underabundance in early-type galaxies', Monthly Notices of the Royal Astronomical Society, vol. 343, no. 1, pp. 279-283. https://doi.org/10.1046/j.1365-8711.2003.06659.x

APA

Thomas, D., Maraston, C., & Bender, R. (2003). New clues on the calcium underabundance in early-type galaxies. Monthly Notices of the Royal Astronomical Society, 343(1), 279-283. https://doi.org/10.1046/j.1365-8711.2003.06659.x

Vancouver

Thomas D, Maraston C, Bender R. New clues on the calcium underabundance in early-type galaxies. Monthly Notices of the Royal Astronomical Society. 2003 Jul;343(1):279-283. https://doi.org/10.1046/j.1365-8711.2003.06659.x

Author

Thomas, D. ; Maraston, C. ; Bender, R. / New clues on the calcium underabundance in early-type galaxies. In: Monthly Notices of the Royal Astronomical Society. 2003 ; Vol. 343, No. 1. pp. 279-283.

Bibtex

@article{102a34f2b76a430dac47eef0c8141690,
title = "New clues on the calcium underabundance in early-type galaxies",
abstract = "We use our new stellar population models, which include effects from variable element abundance ratios, to model the Ca4227 absorption line indices of early-type galaxies (Trager et al.), and to derive calcium element abundances. We find that calcium, although being an alpha-element, is depressed with respect to the other alpha-elements by up to a factor 2. This confirms quantitatively earlier speculations that early-type galaxies are calcium underabundant. We find a clear correlation between alpha/Ca ratio and central velocity dispersion, which implies that more massive galaxies are more calcium underabundant. Interestingly this correlation extends down to the dwarf spheroidal galaxies of the Local Group for which alpha/Ca ratios have been measured from high-resolution spectroscopy of individual stars (Shetrone et al.). The increase of the calcium underabundance with galaxy mass balances the higher total metallicities of more massive galaxies, so that calcium abundance in early-type galaxies is fairly constant and in particular does not increase with increasing galaxy mass. This result may be the key to understand why the CaII triplet absorption of early-type galaxies at 8600 {\AA} is constant to within 5 per cent over a large range of velocity dispersions (Saglia et al.; Cenarro et al.). The origin of the calcium underabundance in early-type galaxies remains yet to be understood. We argue that formation timescales are disfavoured to produce calcium underabundance, and that the option of metallicity dependent supernova yields may be the most promising track to follow",
keywords = "galaxies : abundances, galaxies : elliptical and lenticular, cD, galaxies : evolution, galaxies : formation, galaxies : stellar content",
author = "D. Thomas and C. Maraston and R. Bender",
note = "This article has been accepted for publication in 'Monthly notices of the Royal Astronomical Society {\textcopyright}: 2003 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",
year = "2003",
month = jul,
doi = "10.1046/j.1365-8711.2003.06659.x",
language = "English",
volume = "343",
pages = "279--283",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - New clues on the calcium underabundance in early-type galaxies

AU - Thomas, D.

AU - Maraston, C.

AU - Bender, R.

N1 - This article has been accepted for publication in 'Monthly notices of the Royal Astronomical Society ©: 2003 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2003/7

Y1 - 2003/7

N2 - We use our new stellar population models, which include effects from variable element abundance ratios, to model the Ca4227 absorption line indices of early-type galaxies (Trager et al.), and to derive calcium element abundances. We find that calcium, although being an alpha-element, is depressed with respect to the other alpha-elements by up to a factor 2. This confirms quantitatively earlier speculations that early-type galaxies are calcium underabundant. We find a clear correlation between alpha/Ca ratio and central velocity dispersion, which implies that more massive galaxies are more calcium underabundant. Interestingly this correlation extends down to the dwarf spheroidal galaxies of the Local Group for which alpha/Ca ratios have been measured from high-resolution spectroscopy of individual stars (Shetrone et al.). The increase of the calcium underabundance with galaxy mass balances the higher total metallicities of more massive galaxies, so that calcium abundance in early-type galaxies is fairly constant and in particular does not increase with increasing galaxy mass. This result may be the key to understand why the CaII triplet absorption of early-type galaxies at 8600 Å is constant to within 5 per cent over a large range of velocity dispersions (Saglia et al.; Cenarro et al.). The origin of the calcium underabundance in early-type galaxies remains yet to be understood. We argue that formation timescales are disfavoured to produce calcium underabundance, and that the option of metallicity dependent supernova yields may be the most promising track to follow

AB - We use our new stellar population models, which include effects from variable element abundance ratios, to model the Ca4227 absorption line indices of early-type galaxies (Trager et al.), and to derive calcium element abundances. We find that calcium, although being an alpha-element, is depressed with respect to the other alpha-elements by up to a factor 2. This confirms quantitatively earlier speculations that early-type galaxies are calcium underabundant. We find a clear correlation between alpha/Ca ratio and central velocity dispersion, which implies that more massive galaxies are more calcium underabundant. Interestingly this correlation extends down to the dwarf spheroidal galaxies of the Local Group for which alpha/Ca ratios have been measured from high-resolution spectroscopy of individual stars (Shetrone et al.). The increase of the calcium underabundance with galaxy mass balances the higher total metallicities of more massive galaxies, so that calcium abundance in early-type galaxies is fairly constant and in particular does not increase with increasing galaxy mass. This result may be the key to understand why the CaII triplet absorption of early-type galaxies at 8600 Å is constant to within 5 per cent over a large range of velocity dispersions (Saglia et al.; Cenarro et al.). The origin of the calcium underabundance in early-type galaxies remains yet to be understood. We argue that formation timescales are disfavoured to produce calcium underabundance, and that the option of metallicity dependent supernova yields may be the most promising track to follow

KW - galaxies : abundances

KW - galaxies : elliptical and lenticular, cD

KW - galaxies : evolution

KW - galaxies : formation

KW - galaxies : stellar content

U2 - 10.1046/j.1365-8711.2003.06659.x

DO - 10.1046/j.1365-8711.2003.06659.x

M3 - Article

VL - 343

SP - 279

EP - 283

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 1

ER -

ID: 1795591