期刊
ASTROPHYSICAL JOURNAL
卷 529, 期 2, 页码 L81-L84出版社
UNIV CHICAGO PRESS
DOI: 10.1086/312462
关键词
galaxies : evolution; galaxies : halos; Galaxy : halo; ISM : clouds; Magellanic Clouds; quasars : absorption lines
The properties of the Magellanic Stream constrain the density of coronal gas in the distant Galactic halo. We show that motion through ambient gas can strongly heat Stream clouds, driving mass loss and causing evaporation. If the ambient gas density is too high, then evaporation occurs on unreasonably short timescales. Since heating, dominates drag, tidal stripping appears to be responsible for producing the Stream. Requiring the survival of the cloud MS IV for 500 Myr sets an upper limit on the halo gas density of n(h) < 10(-5) cm (-3) at 50 kpc, roughly a factor of 10 lower than that estimated from the drag model of Moore & Davis. Implications for models of the evolution of gas in galaxy halos are discussed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据