On the vertical equilibrium of the local Galactic disk and the search for disk dark matter

Details On the vertical equilibrium of the local Galactic disk and the search for disk dark matter On the vertical equilibrium of the local Galactic disk and the search for disk dark matter

2011-03-22

arxiv.org/abs/1103.4356v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 2 figures, accepted for publication in ApJ Letters

Scientific paper

Estimates of the dynamical surface mass density at the solar Galactocentric distance are commonly derived assuming that the disk is in vertical equilibrium with the Galactic potential. This assumption has recently been called into question, based on the claim that the ratio between the kinetic and the gravitational energy in such solutions is a factor of 3 larger than required if Virial equilibrium is to hold. Here we show that this ratio between energies was overerestimated and that the disk solutions are likely to be in Virial equilibrium after all. We additionally demonstrate, using one-dimensional numerical simulations, that the disks are indeed in equilibrium. Hence, given the uncertainties, we find no reason to cast doubt on the steady-state solutions which are traditionally used to measure the matter density of the disk.

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