Document Detail

The evolution of galaxies from primeval irregulars to present-day ellipticals.
MedLine Citation:
PMID:  16572164     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Galaxy formation is believed to proceed in a 'bottom up' manner, starting with the formation of small clumps of gas and stars that then merge hierarchically into giant systems. The baryonic gas loses thermal energy by radiative cooling and falls towards the centres of the new galaxies, while supernovae blow gas out. Any realistic model therefore requires a proper treatment of these processes, but hitherto this has been far from satisfactory. Here we report a simulation that follows evolution from the earliest stages of galaxy formation through the period of dynamical relaxation, at which point the resulting galaxy is in its final form. The bubble structures of gas revealed in our simulation (for times of less than 3 x 10(8) years) resemble closely high-redshift Lyman-alpha emitters. After 10(9) years, these bodies are dominated by stellar continuum radiation and then resemble the Lyman break galaxies, which are high-redshift star-forming galaxies. At this point, the abundance of elements heavier than helium ('metallicity') appears to be solar. After 1.3 x 10(10) years, these galaxies resemble present-day ellipticals.
Masao Mori; Masayuki Umemura
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  440     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-30     Completed Date:  2006-04-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  644-7     Citation Subset:  -    
Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA.
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