On the nature and implications of starburst-driven galactic superwinds

Details On the nature and implications of starburst-driven galactic superwinds On the nature and implications of starburst-driven galactic superwinds

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..833h&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Dec. 1990, p. 833-868. Research supported by NSF and NASA.

Astronomy and Astrophysics

Astrophysics

799

Far Infrared Radiation, Interstellar Gas, Starburst Galaxies, Stellar Winds, Galactic Structure, Intergalactic Media, Nebulae, Optical Emission Spectroscopy, Stellar Motions

Scientific paper

Optical spectroscopic data are presented on the ionized nebulae associated with 14 galaxies that are strong far-IR emitters. It is found that the data provide both qualitative and quantitative support for the 'superwind' model in which the kinetic energy provided by SNe and winds from massive stars in a central starburst drives a large-scale outflow that can shock heat and accelerate ambient interstellar and circumgalactic gas. Clear kinematic signatures of an outflow along the galaxy's minor axis are found for the three nearest far-IR galaxies (FIRGs). The FIRG nebulae are highly overpressured relative to the Galactic ISM, with the pressure dropping systematically with distance from the nucleus. Superwinds are energetically adequate to power both the observed optical and X-ray nebulae, and the relative emission-line intensities and their radial variations are consistent with ionization by wind-driven shocks, but not with photoionization by normal O stars or an AGN. The possible astrophysical implications of superwinds are discussed.

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