Journal
ASTRONOMISCHE NACHRICHTEN
Volume 330, Issue 9-10, Pages 960-965Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.200911272
Keywords
galaxies: dwarf; galaxies: evolution; galaxies: structure
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The formation and evolution of galaxies is imprinted on their stellar population radial gradients. Two recent articles present conflicting results concerning the mass dependence of the metallicity gradients for early-type dwarf galaxies. On one side, Spolaor et al. (2009) show a tight positive correlation between the total metallicity [Z/H] and the mass. On the other side, in a distinct sample, we do not find any trend involving [Fe/H] (Koleva et al. 2009). In order to investigate the origin of the discrepancy, we examine various factors that may affect the determination of the gradients: namely the sky subtraction and the signal-to-noise ratio. We conclude that our detection of gradients are well above the possible analysis biases. Then, we measured the [Mg/Fe] relative abundance profile and found moderate gradients. The derived [Z/H] gradients scatter around -0.4 dex/r(e). The two samples contain the same types of objects and the reason of the disagreement is still not understood. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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