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New evidence for halo gas accretion onto disk galaxies

Published online by Cambridge University Press:  01 June 2008

Filippo Fraternali
Filippo Fraternali*
Affiliation:
Astronomy Department, University of Bologna, via Ranzani 1, I-40127, Bologna, Italy email: filippo.fraternali@unibo.it
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Abstract

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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.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 255 - 262
Copyright
Copyright © International Astronomical Union 2009

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