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• W2164266869 abstract "<i>Aims. <i/>We study the chemical evolution of the disks of the Milky Way (MW) and of Andromeda (M 31), to identify the common properties and differences between the two major galaxies of the Local Group.<i>Methods. <i/>We use a large set of observational data for M 31, including observations of the star formation rate (SFR) and gas profiles, as well as stellar metallicity distributions along its disk. When expressed in terms of the corresponding disk scale lengths, we show that the observed radial profiles of MW and M 31 exhibit interesting similarities, suggesting the possibility of a description within a common framework.<i>Results. <i/>We find that the profiles of stars, gas fraction, and metallicity of the two galaxies, as well as most of their global properties, are well described by our model, provided that the star formation efficiency in M 31 disk is twice as high as in the MW. We show that the star formation rate profile of M 31 cannot be described by any form of the Kennicutt-Schmidt law (KS Law) for star formation. We propose that these discrepancies are caused by the fact that M 31 has an active star formation history in the recent past, consistent with the hypotheses of a “head-on” collision with the neighboring galaxy (most probably M 32) about 200 Myr ago.<i>Conclusions. <i/>The MW has most probably experienced quiescent secular evolution, making possible a fairly successful description with a simple model. If M 31 is more typical of spiral galaxies, more complex models, involving galaxy interactions, will be required for the description of spirals." @default.
• W2164266869 created "2016-06-24" @default.
• W2164266869 creator A5000818857 @default.
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• W2164266869 creator A5039594990 @default.
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• W2164266869 date "2009-08-03" @default.
• W2164266869 modified "2023-10-16" @default.
• W2164266869 title "Milky Way versus Andromeda: a tale of two disks" @default.
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