Galactic Superwinds

Physics

Scientific paper

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Scientific paper

I review the theory and observations of galactic-scale outflows (`superwinds') from starburst galaxies, with an emphasis on X-ray and optical data. I consider four specific galaxies as illustrative of the observed ranges of the luminosity of the starburst and the mass of the starburst's `host galaxy'. NGC 1569 is a dwarf galaxy undergoing a starburst of modest luminosity (10^9 Lsolar). M 82 is a somewhat unusual example of a low-mass early-type galaxy with a powerful nuclear starburst. NGC 253 is an L* late-type spiral galaxy containing a nuclear starburst having L_bol = 3 x 10^10 Lsolar (and is typical of the starbursts in IRAS-selected samples). Arp 220 is galactic merger whose nucleus contains a very powerful ( ~ 10^12 Lsolar) starburst (and possibly a `buried' quasar). I conclude with a brief summary of the relevance of superwinds to some current issues in galaxy formation, galaxy evolution, and the heating and enrichment of the inter-galactic medium.

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