• Lyman break studies show that only 5% of the
ionizing photons
escape the ISM (Deharveng et al., 2001, Heckman
et al., 2001)
• But Steidel et al.(2001 ApJ, 546,665): 50% escape at <z>=3.4!
• P-Cygni profiles are seen on high luminosity
side of the LF
(Tenorio Tagle et al., 1999) HI
still present on the
line of
sight
IGM ionization