Subproject A6: Theoretical Chemodynamical Models of the Milky Way

Construction of global chemical enrichment models for the Milky Way, based both on detailed semi-analytic models of the star formation history, the kinematic evolution and the chemical  enrichment of disk and halo, as well as on cosmological hydrodynamical simulations of disk formation.

During the first funding period, a sophisticated chemical enrichment model tracking nine chemical elements was implemented in the moving-mesh code AREPO in order to include chemical enrichment in cosmological hydrodynamic simulations of disk galaxies. The simulation results for metallicity trends including enrichment from supernovae of type II and Ia and from asymptotic giant branch stars begin to resemble the observed abundance ratios as a function of metallicity, but a number of discrepancies remain that still need to be addressed. Furthermore, recognizing the shortcomings of existing disk models, a novel iterative approach for the realization of equilibrium N-body systems for given density distributions has been developed in subproject A6, which allows one to produce disk galaxies with realistic velocity distributions. The underlying code will be made publicly available.

Publications

Yurin, D., Springel, V.: “An iterative method for the construction of N-body galaxy models in collisionless equilibrium”, MNRAS 444, 62 (2014)

Boeche, C., Siebert, A., Piffl, T., Just, A., et al.: “Chemical gradients in the Milky Way from the RAVEdata I. Dwarf stars”, A&A 559, A59 (2013)

Golubov, O., Just, A., Bienayme, O., Bland-Hawthorn, J., Gibson, B. K., Grebel, E. K.; et al.: “Theasymmetric drift, the local standard of rest, ad implications from RAVE data”, A&A 557, A92 (2013)

Kordopatis, G., Gilmore, G., ..., Just, A., et al.: “The radial velocity experiment (RAVE): Fourth datarelease”, ApJ 146, 134 (2013)

Gao, S., Just, A., Grebel, E.K.: “Detailed comparison of Milky Way models based on stellar population synthesis and SDSS star counts at the North Galactic pole”, A&A 549, A20 (2013)

Siebert, A., Famaey, B., ..., Just, A., et al.: „The properties of the local spiral arms from RAVE data:two-dimensional density wave approach”, MNRAS 425, 2335 (2012)

Lee, Y.S., Beers, T.C., An, D., Ivezic, Z., Just, A., et al.: “Formation and evolution of the disk system ofthe Milky Way: [α/Fe] ratios and kinematics of the SEGUE G-dwarf sample”, ApJ 738, 187 (2011)

Just, A., Gao, S., Vidrih, S.: ”Towards a fully consistent Milky Way disk model – II. The local discmodel and SDSS data of the NGP region”, MNRAS 411, 2586 (2011)

Just, A., Jahreiß, H.: ”Towards a fully consistent Milky Way disk model – I. The local model based onkinematic and photometric data”, MNRAS, 402, 461 (2010)

Just, A., Jahreiß, H.: ”The main sequence from F to K stars of the solar neighbourhood in SDSScolours“, AN, 329, 790 (2008)

Onions, J., ..., Springel, V., et al.: “Subhaloes going Notts: the subhalo-finder comparison project”,MNRAS, 423, 1200 (2012)

Starkenburg, E., ..., Springel, V., et al.: “The satellites of the Milky Way - insights from semi-analyticmodelling in a LCDM cosmology”, MNRAS, 429, 725 (2013)