Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-07
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures, accepted for publication in ApJ Letters
Scientific paper
10.1086/519247
High--resolution 2D--MHD numerical simulations have been carried out to investigate the effects of continuing infall of clumpy gas in extended HI galactic disks. Given a certain accretion rate, the response of the disk depends on its surface gas density and temperature. For Galactic conditions at a galactocentric distance of ~20 kpc, and for mass accretion rates consistent with current empirical and theoretical determinations in the Milky Way, the rain of compact high velocity clouds onto the disk can maintain transonic turbulent motions in the warm phase (~2500 K) of HI. Hence, the HI line width is expected to be ~6.5 km/s for a gas layer at 2500 K, if infall were the only mechanism of driving turbulence. Some statistical properties of the resulting forcing flow are shown in this Letter. The radial dependence of the gas velocity dispersion is also discussed.
Franco Jose
Sanchez-Salcedo Javier F.
Santillan Alfredo
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