Hydrostatic equilibrium in a magnetized, warped Galactic disc

Details Hydrostatic equilibrium in a magnetized, warped Galactic disc Hydrostatic equilibrium in a magnetized, warped Galactic disc

2001-01-22

arxiv.org/abs/astro-ph/0101387v2

Mon.Not.Roy.Astron.Soc. 325 (2001) 312

Astronomy and Astrophysics

Astrophysics

9 pages, 9 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04418.x

Hydrostatic equilibrium of the multiphase interstellar medium in the solar vicinity is reconsidered, with the regular and turbulent magnetic fields treated separately. The regular magnetic field strength required to support the gas is consistent with independent estimates provided energy equipartition is maintained between turbulence and random magnetic fields. Our results indicate that a midplane value of $B_{0}=4\mkG$ for the regular magnetic field near the Sun leads to more attractive models than $B_{0}=2\mkG$. The vertical profiles of both the regular and random magnetic fields contain disc and halo components whose parameters we have determined. The layer at $1\la|z|\la4\kpc$ can be overpressured and an outflow at a speed of about $50\kms$ may occur there, presumably associated with a Galactic fountain flow, if $B_{0}\simeq 2\mkG$. We show that hydrostatic equilibrium in a warped disc must produce asymmetric density distributions in $z$, in rough agreement with \HI observations in the outer Galaxy. This asymmetry may be a useful diagnostic of the details of the warping mechanism in the Milky Way and other galaxies. We find indications that gas and magnetic field pressures are different above and below the warped midplane in the outer Galaxy and quantify the difference in terms of turbulent velocity and/or magnetic field strength.

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