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ID 14639
file
creator
Inoue, Akio K.
Yamazaki, Ryo
Nakamura, Takashi
subject
cosmology
observations
gamma rays
bursts
intergalactic medium
radiative transfer
techniques
photometric
NDC
Astronomy. Space sciences
abstract
We discuss a way to study the cosmic reionization history using near-infrared (NIR) observations of the afterglows of high-redshift (5less than or similar tozless than or similar to25) gamma-ray bursts (GRBs) that will be detected by the Swift satellite. In principle, details of the cosmic reionization history should be imprinted in the NIR spectra of GRB afterglows. However, spectroscopy with a space telescope is required to obtain such information for very high redshifts (zgreater than or similar to15) unless the neutral fraction of the high-z universe is less than 10(-6). The broadband photometry has higher sensitivity than the spectroscopy, so that NIR photometric follow-up of GRB afterglows is very promising for examining cosmic reionization history. A few minutes exposure with a 8 m class ground-based telescope of the afterglows of the high-z GRBs will reveal how many times reionization occurred in the universe.
journal title
Astrophysical Journal
volume
Volume 601
issue
Issue 2
start page
644
end page
653
date of issued
2004-02
publisher
University of Chicago Press
issn
0004-637X
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2004 The American Astronomical Society
department
Graduate School of Science