AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION
In 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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/92914 |
| _version_ | 1826215594718920704 |
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| author | Xu, Yidong Yue, Bin Su, Meng Fan, Zuhui Chen, Xuelei |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Xu, Yidong Yue, Bin Su, Meng Fan, Zuhui Chen, Xuelei |
| author_sort | Xu, Yidong |
| collection | MIT |
| description | In 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. |
| first_indexed | 2024-09-23T16:36:23Z |
| format | Article |
| id | mit-1721.1/92914 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:36:23Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/929142022-10-02T08:23:22Z AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION Xu, Yidong Yue, Bin Su, Meng Fan, Zuhui Chen, Xuelei Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Su, Meng In 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. China. Ministry of Science and Technology (863 project grant 2012AA121701) National Natural Science Foundation (China) (NSFC grant 11073024) Templeton Foundation China Postdoctoral Science Foundation Chinese Academy of Sciences (National Astronomical Observatories, Young Researcher Grant) United States. National Aeronautics and Space Administration (NASA, Einstein Postdoctoral Fellowship grant number PF2-130102) National Natural Science Foundation (China) (NSFC grant 11173001) National Natural Science Foundation (China) (NSFC grant 11033005) 2015-01-15T20:36:24Z 2015-01-15T20:36:24Z 2014-02 2013-06 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/92914 Xu, Yidong, Bin Yue, Meng Su, Zuhui Fan, and Xuelei Chen. “AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION.” The Astrophysical Journal 781, no. 2 (January 14, 2014): 97. © 2014 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637x/781/2/97 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Xu, Yidong Yue, Bin Su, Meng Fan, Zuhui Chen, Xuelei AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title | AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title_full | AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title_fullStr | AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title_full_unstemmed | AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title_short | AN ANALYTICAL MODEL OF THE LARGE NEUTRAL REGIONS DURING THE LATE STAGE OF REIONIZATION |
| title_sort | analytical model of the large neutral regions during the late stage of reionization |
| url | http://hdl.handle.net/1721.1/92914 |
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