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The discovery of a galaxy-wide superwind from a young massive galaxy at redshift z ~ 3.

Wilman, R. J. and Gerssen, J. and Bower, R. G. and Morris, S. L. and Bacon, R. and de Zeeuw, P. T. and Davies, R. L. (2005) 'The discovery of a galaxy-wide superwind from a young massive galaxy at redshift z ~ 3.', Nature., 436 (7048). pp. 227-229.

Abstract

High-velocity galactic outflows, driven by intense bursts of star formation and black hole accretion, are processes invoked by current theories of galaxy formation to terminate star formation in the most massive galaxies and to deposit heavy elements in the intergalactic medium. From existing observational evidence (for high-redshift galaxies) it is unclear whether such outflows are localized to regions of intense star formation just a few kiloparsecs in extent, or whether they instead have a significant impact on the entire galaxy and its surroundings. Here we present two-dimensional spectroscopy of a star-forming galaxy at redshift z = 3.09 (seen 11.5gigayears ago, when the Universe was 20 per cent of its current age): its spatially extended Lyalpha line emission appears to be absorbed by HI in a foreground screen covering the entire galaxy, with a lateral extent of at least 100kpc and remarkable velocity coherence. This screen was ejected from the galaxy during a starburst several 108 years earlier and has subsequently swept up gas from the surrounding intergalactic medium and cooled. This demonstrates the galaxy-wide impact of high-redshift superwinds.

Item Type:Article
Keywords:Ly-alpha, Forming galaxies, Luminosity, Radiation, Emission, SSA-22, Matter.
Full text:PDF - Other (180Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1038/nature03718
Record Created:08 May 2008
Last Modified:09 Aug 2011 10:47

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