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Article: An analytical model of the large neutral regions during the late stage of reionization

TitleAn analytical model of the large neutral regions during the late stage of reionization
Authors
Keywordscosmology: theory
Issue Date2014
Citation
Astrophysical Journal, 2014, v. 781, n. 2 How to Cite?
AbstractIn this paper, we investigate the nature and distribution of large neutral regions during the late epoch of reionization. In the bubble model of reionization, the mass distribution of large ionized regions ( bubbles ) during the early stage of reionization is obtained by using the excursion set model, where the ionization of a region corresponds to the first up-crossing of a barrier by random trajectories. We generalize this idea and develop a method to predict the distribution of large-scale neutral regions during the late stage of reionization, taking into account the ionizing background after the percolation of H II regions. The large-scale neutral regions, which we call neutral islands, are not individual galaxies or minihalos, but larger regions where fewer galaxies formed and hence ionized later and they are identified in the excursion set model with the first down-crossings of the island barrier. Assuming that the consumption rate of ionizing background photons is proportional to the surface area of the neutral islands, we obtained the size distribution of the neutral islands. We also take the bubbles-in-island effect into account by considering the conditional probability of up-crossing a bubble barrier after down-crossing the island barrier. We find that this effect is very important. An additional barrier is set to avoid islands being percolated through. We find that there is a characteristic scale for the neutral islands, while the small islands are rapidly swallowed up by the ionizing background; this characteristic scale does not change much as the reionization proceeds. © 2014. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/226708
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorXu, Yidong-
dc.contributor.authorYue, Bin-
dc.contributor.authorSu, Meng-
dc.contributor.authorFan, Zuhui-
dc.contributor.authorChen, Xuelei-
dc.date.accessioned2016-06-29T01:58:21Z-
dc.date.available2016-06-29T01:58:21Z-
dc.date.issued2014-
dc.identifier.citationAstrophysical Journal, 2014, v. 781, n. 2-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/226708-
dc.description.abstractIn this paper, we investigate the nature and distribution of large neutral regions during the late epoch of reionization. In the bubble model of reionization, the mass distribution of large ionized regions ( bubbles ) during the early stage of reionization is obtained by using the excursion set model, where the ionization of a region corresponds to the first up-crossing of a barrier by random trajectories. We generalize this idea and develop a method to predict the distribution of large-scale neutral regions during the late stage of reionization, taking into account the ionizing background after the percolation of H II regions. The large-scale neutral regions, which we call neutral islands, are not individual galaxies or minihalos, but larger regions where fewer galaxies formed and hence ionized later and they are identified in the excursion set model with the first down-crossings of the island barrier. Assuming that the consumption rate of ionizing background photons is proportional to the surface area of the neutral islands, we obtained the size distribution of the neutral islands. We also take the bubbles-in-island effect into account by considering the conditional probability of up-crossing a bubble barrier after down-crossing the island barrier. We find that this effect is very important. An additional barrier is set to avoid islands being percolated through. We find that there is a characteristic scale for the neutral islands, while the small islands are rapidly swallowed up by the ionizing background; this characteristic scale does not change much as the reionization proceeds. © 2014. The American Astronomical Society. All rights reserved.-
dc.languageeng-
dc.relation.ispartofAstrophysical Journal-
dc.subjectcosmology: theory-
dc.titleAn analytical model of the large neutral regions during the late stage of reionization-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0004-637X/781/2/97-
dc.identifier.scopuseid_2-s2.0-84892732629-
dc.identifier.volume781-
dc.identifier.issue2-
dc.identifier.spagenull-
dc.identifier.epagenull-
dc.identifier.eissn1538-4357-

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