Epoch of Reionization
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Recent papers in Epoch of Reionization
The removal of the Galactic and extragalactic foregrounds remains a major challenge for those wishing to make a detection of the Epoch of Reionization 21-cm signal. Multiple methods of modelling these foregrounds with varying levels of... more
JONATHAN P. GARDNER1,∗ , JOHN C. MATHER1, MARK CLAMPIN2, RENE DOYON3, MATTHEW A. GREENHOUSE1, HEIDI B. HAMMEL4, JOHN B. HUTCHINGS5, PETER JAKOBSEN6, SIMON J. LILLY7, KNOX S. LONG8, JONATHAN I. LUNINE9, MARK J. MCCAUGHREAN10,11, ...
After the Big Bang, the intergalactic medium consisted of a dense plasma of fully ionized baryonic materials and it was opaque. While the temperature of the universe was decreasing over time, the ionized particles formed hydrogen and... more
The visibility of Lyα-emitting galaxies during the Epoch of Reionization (EoR) is controlled by both diffuse H I patches in large-scale bubble morphology and small-scale absorbers. To investigate their impact on Lyα photons, we apply a... more
The 21-cm power spectrum (PS) has been shown to be a powerful discriminant of reionization and cosmic dawn astrophysical parameters. However, the 21-cm tomographic signal is highly non-Gaussian. Therefore there is additional information... more
We present an all-sky map synthesized between 139 MHz and 174 MHz using data from both arrays that reaches down to 80 mJy (4.9 K, for a beam size of 2.15e-5 steradians at 154 MHz), with a 10 mJy (620 mK) thermal noise level that indicates... more
The angular power spectrum of the cosmic microwave background temperature anisotropy observed by WMAP has an anomalous dip at l~20 and bump at l~40. One explanation for this structure is the presence of features in the primordial... more
We examine the possibility of constraining the cosmological mean mass and dark energy densities by an application of the Alcock-Paczynski test on redshifted 21-cm maps of the epoch of reionization. The 21-cm data will be provided as a... more
JONATHAN P. GARDNER1,∗ , JOHN C. MATHER1, MARK CLAMPIN2, RENE DOYON3, MATTHEW A. GREENHOUSE1, HEIDI B. HAMMEL4, JOHN B. HUTCHINGS5, PETER JAKOBSEN6, SIMON J. LILLY7, KNOX S. LONG8, JONATHAN I. LUNINE9, MARK J. MCCAUGHREAN10,11, ...
Next generation telescopes such as the James Webb Space Telescope (JWST) and the Wide Field Infrared Survey Telescope (WFIRST) will enable us to study the first billion years of our Universe in unprecedented detail. In this work we use... more
The detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach,... more
We study the constraints on reionization from five years of WMAP data, parametrizing the evolution of the average fraction of ionized hydrogen with principal components that provide a complete basis for describing the effects of... more
The Universe's Epoch of Reionization can be studied using a number of observational probes that provide complementary or corroborating information. Each of these probes suffers from its own systematic and statistical uncertainties. It is... more
The cross-correlation between high redshift galaxies and 21 cm emission from the high redshift intergalactic medium (IGM) promises to be an excellent probe of the Epoch of Reionization (EoR). On large scales, the 21 cm and galaxy fields... more
Redshifted 21cm signal is a promising tool to investigate the state of intergalactic medium (IGM) in the Cosmic Dawn (CD) and Epoch of Reionization(EoR). In our previous work (Shimabukuro et al 2015), we studied the variance and skewness... more
We use deep HST/ACS observations to calculate the star formation history (SFH) of the Cetus dwarf spheroidal (dSph) galaxy. Our photometry reaches below the oldest main sequence turn-offs, which allows us to estimate the age and duration... more
Redshifted 21cm signal is a promising tool to investigate the state of intergalactic medium (IGM) in the Cosmic Dawn (CD) and Epoch of Reionization(EoR). In our previous work (Shimabukuro et al 2015), we studied the variance and skewness... more