Spectroscopic ages and metallicities of galaxies
M. Koleva (IAC, Spain), A. Bedregal (UCM, Spain), Ph. Prugniel (CRAL,, France), S. De Rijcke (UGhent, Belgium), W. W. Zeilinger (UWien, Austria)
TL;DR
This paper demonstrates that full spectrum fitting provides more consistent and precise age and metallicity profiles of dwarf galaxies than traditional spectrophotometric indices, enabling studies of fainter objects with less telescope time.
Contribution
It shows that full spectrum fitting yields more reliable population profiles for dwarf galaxies compared to spectrophotometric indices.
Findings
Full spectrum fitting produces consistent population profiles.
It is more precise than spectrophotometric indices.
Allows studying fainter galaxies efficiently.
Abstract
Dwarf galaxies are generally faint. To derive their age and metallicity distributions, it is critical to optimize the use of any collected photon. Koleva et al., using full spectrum fitting, have found strong population gradients in some dwarf elliptical galaxies. Here, we show that the population profiles derived with this method are consistent and more precise than those obtained with spectrophotometric indices. This allows studying fainter objects in less telescope time.
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