Lyα emitters at z = 6.5 in the SSA22 field: A large-scale fluctuation of the neutral hydrogen fraction at the end of the reionizaion epoch?

A. K. Inoue, E. Nakamura, T. Hayashino, M. Horie, K. Kousai, T. Fujii, Y. Matsuda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In a deep image of the SSA22 field taken through a narrowband filter NB912 installed in the Subaru/Suprime-Cam, we have found the number density of the photometric Lyα emitter (LAE) candidates with LLyα > 3 × 1042 erg s-1 at z = 6.5 is a factor of 3-7 smaller than that found at the same redshift in the Subaru Deep field (SDF). There is a trend that more luminous LAE candidates are fewer. If we consider a scenario that a larger neutral fraction of intergalactic hydrogen, x HI, in the SSA22 field obscures a part of Lya emission, x HI in the SSA22 field should be about 2 times larger than that in the SDF, which is translated into xHI < 0.9 in the SSA22 at z = 6.5.

Original languageEnglish
Title of host publicationDeciphering the Ancient Universe with Gamma-Ray Bursts
Pages340-342
Number of pages3
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts" - Kyoto, Japan
Duration: 2010 Apr 192010 Apr 23

Publication series

NameAIP Conference Proceedings
Volume1279
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts"
CountryJapan
CityKyoto
Period10/4/1910/4/23

Keywords

  • Cosmology: Observations - Galaxies: High-redshift
  • Intergalactic mediu

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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