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Session 51 - Galaxy Evolution and the Intergalactic Medium.
Display session, Wednesday, June 10
Atlas Ballroom,
The Hubble Deep Field (HDF), which was taken from 1995 December 18-30, is the deepest view of the universe. Except a few stars in our Milky Way, most of objects seen in the HDF are very distant galaxies, some of which are nearly as faint as 30th magnitude. The HDF shows a surprising variety of galaxies in the shape and color which helps understand the evolution of the galaxies. The HDF makes it clear that the universe at high redshift looks rather different that it does at the current epoch and galaxies evolve in color and shape. We make a image showing the trend of change of 'big' galaxies in color and shape. We sample all galaxies whose redshifts are measured to date to trace galaxy evolution in high redshift. To compare the real sizes of the galaxies, we construct the true color images of galaxies at constant physical scale by fixing cosmological parameters which affect the sizes of galaxies (h = 0.65, Ømega_0 = 0.1, \Lambda = 0). The true color images of galaxies are assembled from separate images taken in F450W, F606W, and F814W bands. We generate true color images based on logarithmic scale to make the images realistic to human eyes. A few facts on the images are also discussed.
