%0 Generic %1 ferrara2012escape %A Ferrara, A. %A Loeb, A. %D 2012 %K escape fraction ionization reionization %T Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts %U http://arxiv.org/abs/1209.2123 %X Recent data indicates that the cosmic UV emissivity decreased with decreasing redshift z near the end of reionization. Lacking evidence for very massive early stars, this could signal a decline with time in the mass-averaged escape fraction of ionizing radiation from galaxies <fesc> at z > 6. We calculate the evolution of ionization fronts in dark matter halos which host gas in hydrostatic equilibrium at its cooling temperature floor (T~10^4 K for atomic hydrogen). We find a high escape fraction only for the lowest mass halos (with M< 10^8.7 Msun at (1+z)=10) provided their star formation efficiency f_star > 10^-3. Since the low-mass galaxy population is depleted by radiative feedback, we find that indeed <fesc> decreases with time during reionization.

@misc{ferrara2012escape, abstract = {Recent data indicates that the cosmic UV emissivity decreased with decreasing redshift z near the end of reionization. Lacking evidence for very massive early stars, this could signal a decline with time in the mass-averaged escape fraction of ionizing radiation from galaxies <fesc> at z > 6. We calculate the evolution of ionization fronts in dark matter halos which host gas in hydrostatic equilibrium at its cooling temperature floor (T~10^4 K for atomic hydrogen). We find a high escape fraction only for the lowest mass halos (with M< 10^8.7 Msun at (1+z)=10) provided their star formation efficiency f_star > 10^-3. Since the low-mass galaxy population is depleted by radiative feedback, we find that indeed <fesc> decreases with time during reionization.}, added-at = {2012-09-13T16:33:55.000+0200}, author = {Ferrara, A. and Loeb, A.}, biburl = {https://www.bibsonomy.org/bibtex/27e64d191160486e5fa370f34e2b5d905/miki}, description = {[1209.2123] Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts}, interhash = {92dc8678d71cb91c6f640697cd20a984}, intrahash = {7e64d191160486e5fa370f34e2b5d905}, keywords = {escape fraction ionization reionization}, note = {cite arxiv:1209.2123Comment: 8 pages, submitted to MNRAS. Comments welcome}, timestamp = {2012-09-13T16:33:55.000+0200}, title = {Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts}, url = {http://arxiv.org/abs/1209.2123}, year = 2012 }