Reionization and CMB non-Gaussianity
Reionization and CMB non-Gaussianity
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再电离和 CMB 非高斯性
DOI:
10.1093/mnras/stu1123
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发表时间:
2014
影响因子:
4.8
通讯作者:
Munshi D
中科院分区:
文献类型:
--
作者:
Munshi D
We show how cross-correlating a high-redshiftexternaltracer field, such as the 21-cm neutral hydrogen distribution and product maps involving cosmic microwave background (CMB) temperature and polarization fields, that probe mixed bispectrum involving these fields, can help to determine the reionization history of the Universe, beyond what can be achieved from cross-spectrum analysis. Taking clues from recent studies for the detection of primordial non-Gaussianity, we develop a set of estimators that can study reionization using a power spectrum associated with the bispectrum (or skew-spectrum). We use the matched filtering inherent in this method to investigate different reionization histories. We check to what extent they can be used to rule out various models of reionization and study cross-contamination from different sources such as the lensing of the CMB. The estimators can be fine-tuned to optimize study of a specific reionization history. We consider three different types of tracers in our study, namely: proto-galaxies; 21-cm maps of neutral hydrogen; and quasars. We also consider four alternative models of reionization. We find that thecumulativesignal-to-noise ratio (S/N) for detection at ℓmax= 2000 can reachfor cosmic variance limited all-sky experiments. Combining 100 GHz, 143 GHz and 217 GHz channels of thePlanckexperiment, we find that the S/N lies in the range–. The S/N depends on the specific choice of a tracer field, and multiple tracers can be effectively used to map out the entire reionization history with reasonable S/N. Contamination from weak lensing is investigated and found to be negligible, and the effects of Thomson scattering from patchy reionization are also considered.
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DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
R. Khatri;B. Wandelt
通讯作者:
B. Wandelt
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
A. Cooray
通讯作者:
A. Cooray
影响因子:
6.5
作者:
Ade, P. A. R.;Aghanim, N.;Zonca, A.
通讯作者:
Zonca, A.
DOI:
10.1086/308279
发表时间:
1999-07
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Wayne Hu
通讯作者:
Wayne Hu
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
E. Komatsu;D. Spergel;Benjamin Dan Wandelt
通讯作者:
Benjamin Dan Wandelt