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Observations of supershells in the interstellar medium of nearby galaxies

Published online by Cambridge University Press:  01 August 2006

Elias Brinks ,
Ioannis Bagetakos ,
Fabian Walter  and
Erwin de Blok
Elias Brinks
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, UK
Ioannis Bagetakos
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, UK
Fabian Walter
Affiliation:
Max–Planck–Institut für Astronomie, Heidelberg, Germany
Erwin de Blok
Affiliation:
MSSO, Australian National University, Canberra, Australia
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Abstract

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HI observations at sufficiently high spatial and velocity resolution have revealed a wealth of structures such as shells and bubbles in the ISM of late–type galaxies. These structures are filled with metal–enriched, coronal gas from SNe which, through overpressure, powers their expansion. Material swept up by these expanding shells can go “critical” and form subsequent (secondary or propagating) star formation. Shells that grow larger than the thickness of the gas layer will blow out of the disk, spilling enriched material into the halo (or in the case of violent starbursts, the Intergalactic Medium). We review what has been achieved to date and present some first results of a major project based on THINGS (The HI Nearby Galaxy Survey), which aims to extend studies of the ISM in galaxies to 34 nearby systems (<10 Mpc), all observed to the same exacting standards (resolution 6″ × 5 km s−1, or better; typical detection threshold of ~5 × 1019 atom cm−2).

Keywords

galaxies: ISM — ISM: bubbles — ISM: structure — radio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 76 - 83
Copyright
Copyright © International Astronomical Union 2007

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