Quasar H II Regions During Cosmic Reionization

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Cosmic reionization progresses as HII regions form around sources of ionizing radiation. Their average size grows continuously until they percolate and complete reionization. We demonstrate how this typical growth can be calculated around the largest, biased sources of UV emission such as quasars by further developing an analytical model based on the excursion set formalism. This approach allows us to calculate the sizes and growth of the HII regions created by the progenitors of any dark matter halo of given mass and redshift with a minimum of free parameters. Statistical variations in the size of these pre-existing HII regions are ... continued below

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6 pages

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Alvarez, Marcelo A.; Abel, Tom & /KIPAC, Menlo Park March 30, 2007.

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Cosmic reionization progresses as HII regions form around sources of ionizing radiation. Their average size grows continuously until they percolate and complete reionization. We demonstrate how this typical growth can be calculated around the largest, biased sources of UV emission such as quasars by further developing an analytical model based on the excursion set formalism. This approach allows us to calculate the sizes and growth of the HII regions created by the progenitors of any dark matter halo of given mass and redshift with a minimum of free parameters. Statistical variations in the size of these pre-existing HII regions are an additional source of uncertainty in the determination of very high redshift quasar properties from their observed HII region sizes. We use this model to demonstrate that the transmission gaps seen in very high redshift quasars can be understood from the radiation of only their progenitors and associated clustered small galaxies. The fit requires the epoch of overlap to be at z = 5.8 {+-} 0.1. This interpretation makes the transmission gaps independent of the age of the quasars observed. If this interpretation were correct it would raise the prospects of using radio interferometers currently under construction to detect the epoch of reionization.

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6 pages

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  • Journal Name: Submitted to Mon.Not.Roy.Astron.Soc.

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  • Report No.: SLAC-PUB-12429
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 901574
  • Archival Resource Key: ark:/67531/metadc889206

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  • March 30, 2007

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 8:05 p.m.

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Alvarez, Marcelo A.; Abel, Tom & /KIPAC, Menlo Park. Quasar H II Regions During Cosmic Reionization, article, March 30, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc889206/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.