The Morphological Evolution of Field Galaxies |
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| Authors: | Richard S Ellis |
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| Institution: | (1) Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK |
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| Abstract: | I review two observational programs which, together, promise to unravel the detailed astrophysical evolution of normal field
galaxies over the last 5–7 Gyr. Systematic ground-based spectroscopy of faint galaxies have revealed an increasing faint end
slope for the luminosity function with redshift. The trend is strongest for galaxies undergoing intense star-formation. Deep
images taken with the repaired HST can be used to count galaxies as a function of morphological type. Regular "Hubble sequence"
galaxies follow the no-evolution prediction, but irregular/peculiar sources have a steeper count slope and provide the excess
population. Although the overlap between the spectral and HST samples is currently small, plans to merge similar datasets
should reveal the physical explanation for the demise of star formation in faint blue galaxies since z ⋍0.5–1.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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