Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...350..230k&link_type=abstract
Astronomy and Astrophysics, v.350, p.230-239 (1999)
Astronomy and Astrophysics
Astrophysics
42
Magnetohydrodynamics (Mhd), Turbulence, Ism: General, Ism: Structure, Ism: Supernova Remnants
Scientific paper
The evolution of a superbubble is simulated using a local three-dimensional, non-ideal MHD model, which includes galactic differential rotation, an external gravitational potential, heating via supernova explosions and radiative cooling of the interstellar medium (ISM). In our model a superbubble is formed due to the clustering of supernova activity, mimicking an OB association. Supernovae are modelled as instantaneous explosions that release 10(51) erg of thermal energy and 3M_sun of gas in a small volume. We implement a superbubble with the luminosity 3 x 10(37) erg {s(-1) into an initial ISM, which is taken from our earlier calculations modelling the warm and hot phases of the ISM. The simulated ISM has a multi-phase structure with hot, dilute and warm, denser gas coexisting in pressure equilibrium; there is also some cold, dense gas in the form of clouds and filaments arising from supernova compression. The multicomponent gas is in a state of developed turbulence, with r.m.s. velocity 10 and 40{km s(-1) for the warm and hot gas, respectively. At the developed state of the simulation there is a magnetic field of 1.3muG strength having both uniform and random components. The evolution of a superbubble is rather different from that indicated by models with quasi-uniform ambient medium. The superbubble loses its spherical symmetry at very early stages of expansion. Its break-through from the disc is strongly facilitated by the nonuniformity of its environment. A superbubble which would be confined in the disc according to criteria obtained for a quasi-uniform ISM can break out to the halo.
Brandenburg Axel
Korpi Maarit Johanna
Shukurov Anvar
Tuominen Ilkka
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