English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this work, we investigate the effect of Population~III~(Pop.~III) stars inultracompact minihalos~(UCMHs) on the cosmic ionization history using thePlanck observation data. Although high-redshift astrophysics is not understoodyet, UCMHs could host the Pop.~III stars like the halos formed in the standardstructure formation scenario. Such Pop.~III stars would emit ionizing photonsduring their main sequence and facilitate cosmic reionization in highredshifts. To study their effects on the global ionization, we model the cosmicreionization evolution based on the ``tanh"-type reionization model which isexpressed by $z_{\mathrm{reio}}$ with additional two parameters characterizingthe initial mass of UCMHs and the number density of UCMHs. We implement theMonte Carlo Markov Chain analysis with the latest Planck observation data forour reionization model. As the result, we found that if the UCMH initial massis larger than $10^{8.4}\mathrm{M}_{\odot}$, the number density of UCMHs isstrictly limited. Then we obtained the constraint on the amplitude of theprimordial power spectrum through the constraint on the UCMH number densitylike $\mathcal{A}_{\zeta}\lesssim 10^{-8}$ in the scales, $k\lesssim50\mathrm{Mpc}^{-1}$, when we assume that the standard ``tanh"-typereionization occurs by $z=3$, so that we set $z_{\mathrm{reio}}>3$.

Cosmological contribution from population III stars in ultracompact minihalos