%0 Generic %1 sanderbeck2015models %A Sanderbeck, Phoebe R. Upton %A D'Aloisio, Anson %A McQuinn, Matthew J. %D 2015 %K Evolution IGM Thermal %T Models of the Thermal Evolution of the Intergalactic Medium After Reionization %U http://arxiv.org/abs/1511.05992 %X Recent years have brought more precise temperature measurements of the low-density intergalactic medium (IGM). These new measurements constrain the processes that heated the IGM, such as the reionization of HI and of HeII. We present a semi-analytical model for the thermal history of the IGM that follows the photoheating history of primordial gas. We compare this model with recent temperature measurements spanning z= 1.6-4.8, finding that these measurements are consistent with scenarios in which the HeII was reionized at z= 3-4 by quasars. Significantly longer duration or higher redshift HeII reionization scenarios are ruled out by the measurements. For hydrogen reionization, we find that only low redshift and high temperature scenarios are excluded. For example, a model in which the IGM was heated to 30,000K when an ionization front passed, and with hydrogen reionization occurring over 6<z<9, is ruled out. Finally, we place constraints on how much heating could owe to TeV blazars, cosmic rays, and other nonstandard mechanisms. We find that by z= 2 a maximum of 1~eV of additional heat could be injected per baryon over standard photoheating-only models, with this limit becoming ~< 0.5 eV at z>3.

@misc{sanderbeck2015models, abstract = {Recent years have brought more precise temperature measurements of the low-density intergalactic medium (IGM). These new measurements constrain the processes that heated the IGM, such as the reionization of HI and of HeII. We present a semi-analytical model for the thermal history of the IGM that follows the photoheating history of primordial gas. We compare this model with recent temperature measurements spanning z= 1.6-4.8, finding that these measurements are consistent with scenarios in which the HeII was reionized at z= 3-4 by quasars. Significantly longer duration or higher redshift HeII reionization scenarios are ruled out by the measurements. For hydrogen reionization, we find that only low redshift and high temperature scenarios are excluded. For example, a model in which the IGM was heated to 30,000K when an ionization front passed, and with hydrogen reionization occurring over 6<z<9, is ruled out. Finally, we place constraints on how much heating could owe to TeV blazars, cosmic rays, and other nonstandard mechanisms. We find that by z= 2 a maximum of 1~eV of additional heat could be injected per baryon over standard photoheating-only models, with this limit becoming ~< 0.5 eV at z>3.}, added-at = {2015-11-20T09:56:27.000+0100}, author = {Sanderbeck, Phoebe R. Upton and D'Aloisio, Anson and McQuinn, Matthew J.}, biburl = {https://www.bibsonomy.org/bibtex/2f575ec4132c8d11eda7844ad112bca2f/miki}, description = {[1511.05992] Models of the Thermal Evolution of the Intergalactic Medium After Reionization}, interhash = {adc8c1ba6adae28a3cb32ee93170f8cc}, intrahash = {f575ec4132c8d11eda7844ad112bca2f}, keywords = {Evolution IGM Thermal}, note = {cite arxiv:1511.05992Comment: 13 pages, 11 figures}, timestamp = {2015-11-20T09:56:27.000+0100}, title = {Models of the Thermal Evolution of the Intergalactic Medium After Reionization}, url = {http://arxiv.org/abs/1511.05992}, year = 2015 }