期刊
ASTRONOMY & ASTROPHYSICS
卷 554, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321239
关键词
galaxies: abundances; galaxies: evolution; galaxies: formation; Galaxy: disk
资金
- UK's Science & Technology Facilities Council [ST/J001341/1]
- STFC [ST/F007701/1]
- EU [RI-031513, RI-222919]
- Science and Technology Facilities Council [ST/J005673/1, ST/J001341/1, ST/F002432/1, ST/H008586/1, ST/F007701/1, ST/K00333X/1, ST/K000373/1] Funding Source: researchfish
- STFC [ST/H008586/1, ST/F002432/1, ST/K00333X/1, ST/J001341/1, ST/F007701/1, ST/J005673/1, ST/K000373/1] Funding Source: UKRI
Aims. We examine the role of energy feedback in shaping the distribution of metals within cosmological hydrodynamical simulations of L* disc galaxies. While negative abundance gradients today provide a boundary condition for galaxy evolution models, in support of inside-out disc growth, empirical evidence as to whether abundance gradients steepen or flatten with time remains highly contradictory. Methods. We made use of a suite of L* discs, realised with and without enhanced feedback. All the simulations were produced using the smoothed particle hydrodynamics code Gasoline, and their in situ gas-phase metallicity gradients traced from redshift z similar to 2 to the present-day. Present-day age-metallicity relations and metallicity distribution functions were derived for each system. Results. The enhanced feedback models, which have been shown to be in agreement with a broad range of empirical scaling relations, distribute energy and re-cycled ISM material over large scales and predict the existence of relatively flat and temporally invariant abundance gradients. Enhanced feedback schemes reduce significantly the scatter in the local stellar age-metallicity relation and, especially, the [O/Fe]-[Fe/H] relation. The local [O/Fe] distribution functions for our L* discs show clear bimodality, with peaks at [O/Fe] = -0.05 and +0.05 (for stars with [Fe/H] > -1), consistent with our earlier work on dwarf discs. Conclusions. Our results with enhanced feedback are inconsistent with our earlier generation of simulations realised with conservative feedback. We conclude that spatially-resolved metallicity distributions, particularly at high-redshift, offer a unique and under-utilised constraint on the uncertain nature of stellar feedback processes.
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