Other
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..444f&link_type=abstract
The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 444-446 (1997).
Other
Origin, Formation, Evolution, Age, And Star Formation, Observational Cosmology, Dark Matter
Scientific paper
The observational advancement made over the last five years has enabled us to understand the history of galaxies below z<1. The resulting picture in the 0th order approximation is that giant galaxies were already mature by z=1, showing only small amount of the evolution after this redshift: on the other hand, smallish galaxies, a typical example being irregular galaxies, evolve fast at lower redshift, undergoing active star formation. These galaxies are primarily responsible for the long-standing faint blue galaxy problem. I infer that irregular galaxies and disks of late-type spiral galaxies are assembled late in the universe (mostly z=1-2) and are more gaseous; hence undergo active star formation. The evolution of galaxies at low redshift is basically a gas depleting process in a quasi-closed system. Much less is known for the evolution at z>1, but we are beginning to learn what happened with the galaxies at such redshift by virtue of the Hubble Deep Field observation and deep redshift surveys, especially those for the K-band selected sample. These observations already give interesting constraints on the early evolution of elliptical galaxies, a key question for the history of galaxies. I try to summarize how these observations are understood with a simple conventional model, or where it fails. I will also note the advantages and disadvantages of a rival model for the evolution of galaxies-the model based on the Cold Dark Matter (CDM) picture. Discussion is also made on key observations to understand the formation and early evolution of galaxies [1].
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