%0 Generic %1 smith2016lymanalpha %A Smith, Aaron %A Bromm, Volker %A Loeb, Abraham %D 2016 %K hydrodynamics lya radiation %T Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization %U http://arxiv.org/abs/1607.07166 %X The dynamical impact of Lyman-alpha (Ly\alpha) radiation pressure on galaxy formation depends on the rate and duration of momentum transfer between Ly\alpha photons and neutral hydrogen gas. Although photon trapping has the potential to multiply the effective force, ionizing radiation from stellar sources may relieve the Ly\alpha pressure before appreciably affecting the kinematics of the host galaxy or efficiently coupling Ly\alpha photons to the outflow. We present self-consistent Ly\alpha radiation-hydrodynamics simulations of high-$z$ galaxy environments by coupling the Cosmic Ly\alpha Transfer code (COLT) with spherically symmetric Lagrangian frame hydrodynamics. The accurate but computationally expensive Monte-Carlo radiative transfer calculations are feasible under the one-dimensional approximation. In certain cases Ly\alpha feedback significantly enhances the velocity of the shell of gas expanding around a central source. Radiative feedback alone is capable of ejecting baryons into the intergalactic medium (IGM) for protogalaxies with a virial mass of $M_vir 10^8~M_ødot$. We compare the Ly\alpha signatures of Population III stars with $10^5$ K blackbody emission to that of direct collapse black holes with a nonthermal Compton-thick spectrum and find substantial differences. For both sources, the flux emerging from the galaxy is reprocessed by the IGM such that the observed Ly\alpha luminosity is reduced significantly and the time-averaged velocity offset of the Ly\alpha peak is shifted redward.

@misc{smith2016lymanalpha, abstract = {The dynamical impact of Lyman-alpha (Ly{\alpha}) radiation pressure on galaxy formation depends on the rate and duration of momentum transfer between Ly{\alpha} photons and neutral hydrogen gas. Although photon trapping has the potential to multiply the effective force, ionizing radiation from stellar sources may relieve the Ly{\alpha} pressure before appreciably affecting the kinematics of the host galaxy or efficiently coupling Ly{\alpha} photons to the outflow. We present self-consistent Ly{\alpha} radiation-hydrodynamics simulations of high-$z$ galaxy environments by coupling the Cosmic Ly{\alpha} Transfer code (COLT) with spherically symmetric Lagrangian frame hydrodynamics. The accurate but computationally expensive Monte-Carlo radiative transfer calculations are feasible under the one-dimensional approximation. In certain cases Ly{\alpha} feedback significantly enhances the velocity of the shell of gas expanding around a central source. Radiative feedback alone is capable of ejecting baryons into the intergalactic medium (IGM) for protogalaxies with a virial mass of $M_{\rm vir} \lesssim 10^8~{\rm M}_\odot$. We compare the Ly{\alpha} signatures of Population III stars with $10^5$ K blackbody emission to that of direct collapse black holes with a nonthermal Compton-thick spectrum and find substantial differences. For both sources, the flux emerging from the galaxy is reprocessed by the IGM such that the observed Ly{\alpha} luminosity is reduced significantly and the time-averaged velocity offset of the Ly{\alpha} peak is shifted redward.}, added-at = {2016-07-26T10:05:14.000+0200}, author = {Smith, Aaron and Bromm, Volker and Loeb, Abraham}, biburl = {https://www.bibsonomy.org/bibtex/29478c125d07b89f63e95d8940611839e/miki}, description = {[1607.07166] Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization}, interhash = {c346fa465c58491c55869ce82576b1ec}, intrahash = {9478c125d07b89f63e95d8940611839e}, keywords = {hydrodynamics lya radiation}, note = {cite arxiv:1607.07166Comment: 14 pages, 11 figures, submitted to MNRAS}, timestamp = {2016-07-26T10:05:14.000+0200}, title = {Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization}, url = {http://arxiv.org/abs/1607.07166}, year = 2016 }