期刊
NEW ASTRONOMY REVIEWS
卷 51, 期 1-2, 页码 95-98出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.newar.2006.10.009
关键词
spiral galaxies; haloes; NGC 891; gas dynamics
In recent years, evidence has accumulated that nearby spiral galaxies are surrounded by massive haloes of neutral and ionised gas. These gaseous haloes rotate more slowly than the disks and show inflow motions. They are clearly analogous to the High Velocity Clouds of the Milky Way. We show that these haloes cannot be produced by a galactic fountain process (supernova outflows from the disk) where the fountain gas conserves its angular momentum. Making this gas interact with a pre-existing hot corona does not solve the problem. These results point at the need for a substantial accretion of low angular momentum material from the IGM. (c) 2006 Elsevier B.V. All rights reserved.
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