Fuel for Galaxy Disks
M.E. Putman, J. Grcevich (U. Michigan), J.E.G. Peek (UC Berkeley)
TL;DR
This paper reviews the role of halo clouds as a common source of fuel for galaxy disks, discussing their origins, contributions to star formation, and implications for galaxy evolution.
Contribution
It provides a comprehensive analysis of halo clouds as a generic feature in galaxy evolution and quantifies their contribution to fueling galaxy disks.
Findings
Halo clouds are common around large galaxies in the Local Group.
Halo clouds significantly contribute to the gas supply for star formation.
The origin of halo gas in M31 and M33 is explored.
Abstract
Halo clouds have been found about the three largest galaxies of the Local Group and in the halos of nearby spirals. This suggests they are a relatively generic feature of the galaxy evolution process and a source of fuel for galaxy disks. In this review, two main sources of disk star formation fuel, satellite material and clouds condensing from the hot halo medium, are discussed and their contribution to fueling the Galaxy quantified. The origin of the halo gas of M31 and M33 is also discussed.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Galaxies: Formation, Evolution, Phenomena