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Probing ISM Models with Hα Observations

Published online by Cambridge University Press:  05 March 2013

Andrea Ferrara
Andrea Ferrara*
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo. E. Fermi 5, Firenze, Italy, 50125; ferrara@arcetri.astro.it
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Abstract

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I review the capabilities of Hα observations to constrain some aspects of the current models of the interstellar medium. In particular, it is shown that turbulence is a necessary ingredient of any viable model, since most of the energy produced by supernova explosions and ionising radiation is stored in kinetic form in the ISM. Various forms of turbulent energy dissipation, including cloud collisions, are analysed. Two additional aspects, concerning the existence of galactic fountains and their relation with high-velocity Clouds, and the extended ionised layer of spiral galaxies are discussed; some crucial experiments are suggested.

Keywords

interstellar mediumturbulence
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 19 - 23
Copyright
Copyright © Astronomical Society of Australia 1998

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