%0 Generic %1 noh2014physical %A Noh, Yookyung %A McQuinn, Matthew %D 2014 %K accretion mass minimum reionization %T A Physical Understanding of how Reionization Suppresses Accretion onto Dwarf Halos %U http://arxiv.org/abs/1401.0737 %X We develop and test with cosmological simulations a physically motivated theory for how the interplay between gravity, pressure, cooling, and self-shielding set the redshift--dependent mass scale at which halos can accrete intergalactic gas. This theory provides a physical explanation for the halo mass scale that can accrete unshocked intergalactic gas, which has been explained with ad hoc criteria tuned to reproduce the results of a few simulations. Furthermore, it provides an intuitive explanation for how this mass scale depends on the reionization redshift, the amplitude of the ionizing background, and the redshift. We show that accretion is inhibited onto more massive halos than had been thought because previous studies had focused on the gas fraction of halos rather than the instantaneous mass that can accrete gas. A halo as massive as 10^11 Msun cannot accrete intergalactic gas at z=0, even though typically its progenitors were able to accrete gas at higher redshifts. We describe a simple algorithm that can be implemented in semi-analytic models, and we compare this algorithm implemented on top of a halo merger tree to the results in the simulations.

@misc{noh2014physical, abstract = {We develop and test with cosmological simulations a physically motivated theory for how the interplay between gravity, pressure, cooling, and self-shielding set the redshift--dependent mass scale at which halos can accrete intergalactic gas. This theory provides a physical explanation for the halo mass scale that can accrete unshocked intergalactic gas, which has been explained with ad hoc criteria tuned to reproduce the results of a few simulations. Furthermore, it provides an intuitive explanation for how this mass scale depends on the reionization redshift, the amplitude of the ionizing background, and the redshift. We show that accretion is inhibited onto more massive halos than had been thought because previous studies had focused on the gas fraction of halos rather than the instantaneous mass that can accrete gas. A halo as massive as 10^11 Msun cannot accrete intergalactic gas at z=0, even though typically its progenitors were able to accrete gas at higher redshifts. We describe a simple algorithm that can be implemented in semi-analytic models, and we compare this algorithm implemented on top of a halo merger tree to the results in the simulations.}, added-at = {2014-01-07T11:39:39.000+0100}, author = {Noh, Yookyung and McQuinn, Matthew}, biburl = {https://www.bibsonomy.org/bibtex/2ae98b6effbab98cb8d8927e649b04e3b/miki}, description = {[1401.0737] A Physical Understanding of how Reionization Suppresses Accretion onto Dwarf Halos}, interhash = {97faf43546eb7efcdd3560d2af836f91}, intrahash = {ae98b6effbab98cb8d8927e649b04e3b}, keywords = {accretion mass minimum reionization}, note = {cite arxiv:1401.0737Comment: 13 pages, 8 figures; submitted to MNRAS}, timestamp = {2014-01-07T11:39:39.000+0100}, title = {A Physical Understanding of how Reionization Suppresses Accretion onto Dwarf Halos}, url = {http://arxiv.org/abs/1401.0737}, year = 2014 }