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The Violent Interstellar Medium of Nearby Dwarf Galaxies

Published online by Cambridge University Press:  05 March 2013

Fabian Walter
Fabian Walter*
Affiliation:
Radioastronomisches Institut, Auf dem Hügel 71, 53121 Bonn, Germany; walter@astro.uni-bonn.de
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Abstract

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High resolution HI observations of nearby dwarf galaxies (most of which are situated in the M81 group at a distance of about 3·2 Mpc) reveal that their neutral interstellar medium (ISM) is dominated by hole-like features most of which are expanding. A comparison of the physical properties of these holes with the ones found in more massive spiral galaxies (such as M31 and M33) shows that they tend to reach much larger sizes in dwarf galaxies. This can be understood in terms of the galaxy's gravitational potential. The origin of these features is still a matter of debate. In general, young star forming regions (OB-associations) are held responsible for their formation. This picture, however, is not without its critics and other mechanisms such as the infall of high velocity clouds, turbulent motions or even gamma ray bursters have been recently proposed. Here I will present one example of a supergiant shell in IC 2574 which corroborates the picture that OB associations are indeed creating these structures. This particular supergiant shell is currently the most promising case to study the effects of the combined effects of stellar winds and supernova explosions which shape the neutral interstellar medium of (dwarf) galaxies.

Keywords

galaxies: individual (IC 2574, Holmberg II, DDO 47, NGC 3077)ISM: kinematic and dynamicsISM: structure radio linesISM: X-rays
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 1 , 1999 , pp. 106 - 112
Copyright
Copyright © Astronomical Society of Australia 1999

References

Bomans, D. J., Chu, Y.-H., & Hopp, U. 1997, AJ, 113, 1678 Google Scholar
Bomans, D. J., Dennerl, K., & Kürster, M. 1994, A&A, 283, L21 Google Scholar
Brand, P. W. J. L., & Zealey, W. J. 1975, A&A, 38, 363 Google Scholar
Brinks, E., & Bajaja, E. 1986, A&A, 169, 14 Google Scholar
Brinks, E., & Walter, F. 1998, in Proc. Bonn/Bochum-Graduiertenkolleg Workshop on the Magellanic Clouds and Other Dwarf Galaxies, ed. Richtler, T. & Braun, J. M., p. 1 Google Scholar
Chevalier, R. A. 1974, ApJ, 188, 501 Google Scholar
Chu, Y.-H., Chang, H.-W., Su, Y.-L., & Mac Low, M.-M. 1995, ApJ, 450, 156 Google Scholar
Cox, D. P., & Smith, B. W. 1974, ApJL, 189, L105 Google Scholar
Deul, E. R., & den Hartog, R. H. 1990, A&A, 229, 362 Google Scholar
Efremov, Yu. N., Elmegreen, B. G., & Hodge, P. W. 1998, ApJL, 501, L163 Google Scholar
Elmegreen, B. G. 1994, ApJ, 427, 384 Google Scholar
Heiles, C. 1979, ApJ, 229, 533 Google Scholar
Heiles, C. 1984, ApJS, 55, 585 CrossRefGoogle Scholar
Kim, S., Staveley-Smith, L., Dopita, M. A., Freeman, K. C., Sault, R. J., Kesteven, M. J., & McConnell, D. 1998 a, ApJ, 503, 674 Google Scholar
Kim, S., Chu, Y.-H., Staveley-Smith, L., & Smith, R. C. 1998 b, ApJ, 503, 729 Google Scholar
Mac Low, M.-M., Chang, T. H., Chu, Y.-H., & Points, S. D. 1998 a, ApJ, 493, 260 Google Scholar
Mac Low, M.-M., Klessen, R. S., Burkert, A., & Smith, M. D. 1998 b, Phys. Rev. Lett., 80, 2754 Google Scholar
Miller, B. W. 1995, ApJL, 446, L75 Google Scholar
Puche, D., Westpfahl, D., Brinks, E., & Roy, J.-R. 1992, AJ, 103, 1841 Google Scholar
Radice, L. A., Salzer, J. J., & Westpfahl, D. J. 1995, BAAS, 186, 49.08Google Scholar
Raymond, J. C., & Smith, B. W. 1977, ApJ Supp., 35, 419 CrossRefGoogle Scholar
Rhode, K. L., Salzer, J. J., & Westpfahl, D. J. 1997, BAAS, 191, 81.09Google Scholar
Staveley-Smith, L., Sault, R. J., Hatzidimitrou, D., Kesteven, M. J., & McConnell, D. 1997, MNRAS, 289, 225 Google Scholar
Tenorio-Tagle, G., & Bodenheimer, P. 1988, ARA&A, 26, 145 Google Scholar
Tenorio-Tagle, G., Franco, J., Bodenheimer, P., & Różyczka, M. 1987, A&A, 179, 219 Google Scholar
Thilker, D. A., Braun, R., & Walterbos, R. A. M. 1998, A&A, 332, 429 Google Scholar
van der Hulst, J. M. 1996, in The Minnesota Lectures on Extragalactic Neutral Hydrogen, ASP Conf. Ser. 106, ed. Skillman, E. D. (San Francisco: ASP), p. 47 Google Scholar
van der Hulst, J. M., & Sancisi, R. 1988, AJ, 95, 1354 Google Scholar
Van Dyk, S. D., Puche, D., & Wong, T. 1998, AJ, 116, 2341 Google Scholar
Walter, F., & Brinks, E. 1998, in ‘The Low Surface Brightness Universe’, IAU Colloq. 171, Cardiff, UK, ed. Davies, J. & Impey, C., in pressGoogle Scholar
Walter, F., & Brinks, E. 1999, AJ, in pressGoogle Scholar
Walter, F., Kerp, J., Duric, N., Brinks, E., & Klein, U. 1998, ApJL, 502, L143 Google Scholar
Weaver, R., McCray, R., Castor, J., Shapiro, P., & Moore, R. 1977, ApJ, 218, 377 Google Scholar
Wilcots, E. M., & Miller, B. 1998, AJ, 116, 2363 Google Scholar
Yun, M. S., Ho, P. T. P., & Lo, K. Y. 1994, Nature, 372, 530 Google Scholar