期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 415, 期 2, 页码 1469-1478出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18793.x
关键词
Galaxy: disc; Galaxy: kinematics and dynamics; galaxies: abundances; galaxies: evolution; galaxies: formation; galaxies: interactions
资金
- UK's Science & Technology Facilities Council (STFC) [ST/H00260X/1, ST/F002432/1]
- Commonwealth Cosmology Initiative
- European DUEL RTN [MRTN-CT-2006-036133]
- Science and Technology Facilities Council [ST/F007019/1, ST/F002432/1, ST/G003025/1, ST/H00260X/1] Funding Source: researchfish
- STFC [ST/F002432/1, ST/F007019/1, ST/H00260X/1, ST/G003025/1] Funding Source: UKRI
We analyse for the first time the radial abundance gradients of the disc stars of a disc galaxy simulated with our three-dimensional, fully cosmological chemodynamical galaxy evolution code GCD+. We study how [Fe/H], [N/O], [O/Fe], [Mg/Fe] and [Si/Fe] vary with galactocentric radius. For the young stars of the disc, we found a negative slope for [Fe/H] and [N/O] but a positive [O/Fe], [Mg/Fe] and [Si/Fe] slope with radius. By analysing the star formation rate at different radii, we found that the simulated disc contains a greater fraction of young stars in the outer regions, while the old stars tend to be concentrated in the inner parts of the disc. This can explain the positive [alpha/Fe] gradient as well as the negative [N/O] gradient with radius. This radial trend is a natural outcome of an inside-out formation of the disc, regardless of its size and can thus explain the recently observed positive [alpha/Fe] gradients in the Milky Way disc open clusters.
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