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Gas Accretion onto the Milky Way

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arxiv 1612.00449 v1 pith:3ILPNJ2X submitted 2016-12-01 astro-ph.GA

Gas Accretion onto the Milky Way

classification astro-ph.GA
keywords milkyaccretionratecurrentdiskgalaxyhalopart
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Milky Way is surrounded by large amounts of gaseous matter that are slowly being accreted over cosmic timescales to support star formation in the disk. The corresponding gas-accretion rate represents a key parameter for the past, present, and future evolution of the Milky Way. In this article, I discuss our current understanding of gas accretion processes in the Galaxy by reviewing past and recent observational and theoretical studies. The first part of this review deals with the spatial distribution of the different gas phases in the Milky Way halo, the origin of the gas, and its total mass. The second part discusses the gas dynamics and the physical processes that regulate the gas flow from the outer Galactic halo to the disk. From the most recent studies follows that the present-day gas accretion rate of the Milky Way is a few solar masses per year, which is sufficient to maintain the Galaxy's star-formation rate at its current level.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Gas accretion onto the Milky Way: high-velocity cloud survival and the revival of the terminal-velocity paradigm

    astro-ph.GA 2026-07 conditional novelty 7.0

    Terminal velocity is a local, conditional equilibrium for Milky Way high-velocity clouds: dense clouds fall quasi-ballistically, adiabatic clouds break up, and radiative cooling can restore terminal-like motion.