Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-01-10
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
13 pages, 4 figures (1 color), accepted by ApJL
Scientific paper
10.1088/0004-637X/692/1/L24
We demonstrate for the first time that gaseous halos of disk galaxies can play a vital role in recycling metal-rich gas ejected from the bulges and thus in promoting chemical evolution of disks. Our numerical simulations show that metal-rich stellar winds from bulges in disk galaxies can be accreted onto the thin disks owing to hydrodynamical interaction between the gaseous ejecta and the gaseous halos, if the mean densities of the halos (rho_ hg) are as high as 10^{-5} cm^{-3}. The total amount of gas that is ejected from a bulge through a stellar wind and then accreted onto the disk depends mainly on rho_ hg and the initial velocity of the stellar wind. About ~ 1% of gaseous ejecta from bulges in disk galaxies of scale length a_d can be accreted onto disks around R ~ 2.5 a_ d for a reasonable set of model parameters. We discuss these results in the context of the origin of the surprisingly high metallicities of the solar neighborhood disk stars in the Galaxy. We also discuss some implications of the present results in terms of chemical evolution of disk galaxies with possibly different rho_ hg in different galaxy environments.
Bekki Kenji
Chiba Masashi
Tsujimoto Takuji
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