This project is conducted in Fall 2014
It is important to investigate the high-redshift galaxies through spectroscopy or photometry because they trace the early universe. I utilized the Lyman break to obtain the redshift value. It can roughly estimate the photometric redshift through color-color diagrams and we successfully selected redshift around 3,4 and 5.
Instead of looking for featured spectral lines, we look for the dropout of flux in some of the bands that we call Lyman Break@912Å, which is caused by the absorption of gas.
At z=3, Lyman Break is at about 4000Å, so the dropout should be in U band (center wavelength=3660 Å). So magnitude in B band and U band should be large compared to the difference in B band and bands with larger center wavelength.