New evidence for halo gas accretion onto disk galaxies

Details New evidence for halo gas accretion onto disk galaxies New evidence for halo gas accretion onto disk galaxies

2008-07-21

arxiv.org/abs/0807.3365v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures. Invited talk at IAU 254 "The Galaxy Disk in Cosmological Context", Copenhagen, June 9-13, 2008

Scientific paper

Studies of the halo gas in the Milky Way and in nearby spiral galaxies show the presence of gas complexes that cannot be reconciled with an internal (galactic fountain) origin and are direct evidence of gas accretion. Estimating gas accretion rates from these features consistently gives values, which are one order of magnitude lower than what is needed to feed the star formation. I show that this problem can be overcome if most of the accretion is in fact "hidden" as it mixes with the galactic fountain material coming from the disk. This model not only provides an explanation for the missing gas accretion but also reproduces the peculiar kinematics of the halo gas in particular the vertical rotation gradient. In this view this gradient becomes indirect evidence for gas accretion.

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