Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.s4002s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The last few years have seen very rapid developments in our empirical understanding of galaxy formation, through the use of efficient techniques for locating and studying distant galaxies, new telescopes, and new instrumental capabilities. I will summarize the current observational picture for the history of galaxies and their large--scale distribution over the past 90-95% of the age of the universe, with emphasis on the earlier phases of the galaxy formation process, for which there now exists significant statistical information. Generally speaking, observations of objects at high redshift are consistent with standard theoretical expectations for a low-density, flat universe dominated by cold dark matter, but such comparisons depend intimately on the details of the ``mapping'' between the (dark) matter distribution and the detectable gas and stars. We are rapidly gaining insight into how complex baryon physics (cooling, star formation, feedback) combines with the evolving dark matter distribution to produce the observable universe. Despite the rapid progress, the complicated process of galaxy formation is likely to remain an unsolved problem well into the future--even after the cosmological parameters have been accurately determined.
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