First study of reionization in the Planck 2015 normalized closed ΛCDM inflation model

被引：22

作者：

Mitra, Sourav ^{[1
]}

Choudhury, Tirthankar Roy ^{[2
]}

Ratra, Bharat ^{[3
]}

机构：

[1] Surendranath Coll, Dept Phys, 24-2 MG Rd, Kolkata 700009, India

[2] TIFR, Natl Ctr Radio Astrophys, Post Bag 3, Pune 411007, Maharashtra, India

[3] Kansas State Univ, Dept Phys, 116 Cardwell Hall, Manhattan, KS 66506 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 479卷 / 04期

关键词：

galaxies: high-redshift; intergalactic medium; quasars: general; dark ages; reionization; first stars; inflation; large-scale structure of Universe; ACTIVE GALACTIC NUCLEI; BARYON ACOUSTIC-OSCILLATIONS; PRINCIPAL-COMPONENT ANALYSIS; LY-ALPHA-EMITTERS; QUASAR NEAR-ZONES; INTERGALACTIC MEDIUM; COSMIC REIONIZATION; REDSHIFT EVOLUTION; LUMINOSITY FUNCTIONS; MEDIAN STATISTICS;

D O I：

10.1093/mnras/sty1835

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study reionization in two non-flat Lambda CDM inflation models that best fit the Planck 2015 cosmic microwave background (CMB) anisotropy observations, ignoring or in conjunction with baryon acoustic oscillation distance measurements. We implement a principal component analysis (PCA) to estimate the uncertainties in the reionization history from a joint quasar-CMB data set. A thorough Markov Chain Monte Carlo analysis is done over the parameter space of the PCAmodes for both non-flat Lambda CDM inflationmodels aswell as the original Planck 2016 tilted, spatially flat Lambda CDM inflation model. Although both flat and non-flat models can closely match the low-redshift (z <= 6) observations, we notice a possible tension between high-redshift (z similar to 8) Lyman alpha emitter data and the non-flat models. This is solely due to the fact that the closed models have a relatively higher reionization optical depth compared to the flat one, which in turn demands more high-redshift ionizing sources and favours an extended reionization starting as early as z approximate to 14. We conclude that as opposed to flat cosmology, for the non-flat cosmology models (i) the escape fraction needs steep redshift evolution and even unrealistically high values at some redshifts and (ii) most of the physical parameters require to have non-monotonic redshift evolution, especially apparent when Lyman a emitter data are included in the analysis.

引用

页码：4566 / 4576

页数：11

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