The Metal Enrichment of the Milky Way and its Sstellites in a Satellites in a Hierarchical Galaxy Formation Model
We investigate the metal enrichment of the Milky Way and its satellite dwarf galaxies in a hierarchical galaxy formation model based on the cold dark matter model. In Nagashima and Okamoto (2006), we have introduced the chemical enrich ment due to Type la supemovae (SNe la) into the Mitaka semi-analytic galaxy forma tion model, in order to investigate the metal enrichment of Milky Way-Iike galaxies. Here we focus not only on the Milky Way-Iike galaxies but also on satellite dwarf galaxies around the Milky Way-Iike galaxies. Recent high resolution ob8ervations have revealed that the 8tellar distributions in a O/Fel-Fe/H plane are systematically dif ferent from the Milky Ways, that is, metal-poor stars in dwarf spheroidals tend to have lower values of O/Fe than in the Milky Way. We find that our model can repro duce such stars. We also find that these stars are produced through stronger supernova feedback than in the Milky Way.
stars abundances galaxies abundances galaxies dwarf galaxies evo-lution galaxies formation
Masahiro Nagashima Takashi Okamoto
Faculty of Education, Nagasaki University, Nagasaki 852-8521, Japan Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
国际会议
The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)
昆明
英文
320-322
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）