IMF and [Na/Fe] abundance ratios from optical and NIR spectral features in early-type galaxies

@article{Barbera2017IMFA,
  title={IMF and [Na/Fe] abundance ratios from optical and NIR spectral features in early-type galaxies},
  author={Francesco Barbera and Alexandre Vazdekis Vazdekis and Ignacio Dur{\'a}n Ferreras and Anna Pasquali and C. Allende Prieto and Ben Rock and David Aguado and Reynier F. Peletier},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2017},
  volume={464},
  pages={3597-3616}
}
  • Francesco Barbera, Alexandre Vazdekis Vazdekis, +5 authors Reynier F. Peletier
  • Published 2017
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • We present a joint analysis of the four most prominent sodium-sensitive features (Na D, Na I λ8190A, Na I λ1.14 μm, and Na I λ2.21 μm), in the optical and near-infrared spectral ranges, of two nearby, massive (σ ˜ 300 km s-1), early-type galaxies (named XSG1 and XSG2). Our analysis relies on deep Very Large Telescope/X-Shooter long-slit spectra, along with newly developed stellar population models, allowing for [Na/Fe] variations, up to ˜1.2 dex, over a wide range of age, total metallicity, and… CONTINUE READING

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