Browsing Faculty of Natural Sciences by Title
Now showing items 445-464 of 2567
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Cosmological 3D Hi Gas Map with HETDEX Lyα Emitters and eBOSS QSOs at z = 2: IGM-Galaxy/QSO Connection and a ∼ 40-Mpc Scale Giant Hii Bubble Candidate
(IOP Publishing, 2020)We present cosmological (30−400 Mpc) distributions of neutral hydrogen (H i) in the intergalactic medium (IGM) traced by Lyα emitters (LAEs) and QSOs at z = 2.1–2.5, selected with the data of the ongoing Hobby–Eberly ... -
Cosmological baryon transfer in the SIMBA simulations
(Oxford University Press, 2019)We present a framework for characterizing the large-scale movement of baryons relative to dark matter in cosmological simulations, requiring only the initial conditions and final state of the simulation. This is performed ... -
Cosmological constraints from the EFT power spectrum and tree-level bispectrum of 21 cm intensity maps
(Elsevier B.V., 2024)We explore the information content of 21 cm intensity maps in redshift space using the 1-loop Effective Field Theory power spectrum model and the bispectrum at tree level. The 21 cm signal contains signatures of dark matter, ... -
Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps
(IOP Publishing, 2022)The 21cm emission of neutral hydrogen is a potential probe of the matter distribution in the Universe after reionisation. Cosmological surveys of this line intensity will be conducted in the coming years by the SKAO and ... -
Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity
(2019)We study the cosmological constraints on the variation of Newton’s constant and on post-Newtonian parameters for simple models of the scalar-tensor theory of gravity beyond the extended Jordan-BransDicke theory. We restrict ... -
Cosmological evolution of matter with interacting dust fluids
(Springer Nature, 2024)We split the total matter fluid into a bound (halo) component and an unbound (free particles) fluid component that is accreted by the halos. We adopt a different framework that treats the structure formation problem as a ... -
Cosmology from HI galaxy surveys with the SKA
(Proceedings of Science, 2014)The Square Kilometer Array (SKA) has the potential to produce galaxy redshift surveys which will be competitive with other state of the art cosmological experiments in the next decade. In this chapter we summarise what ... -
Cosmology on the largest scales with the SKA
(Proceedings of Science, 2014)The study of the Universe on ultra-large scales is one of the major science cases for the Square Kilometre Array (SKA). The SKA will be able to probe a vast volume of the cosmos, thus representing a unique instrument, ... -
Cosmology on ultralarge scales with intensity mapping of the neutral hydrogen 21 cm emission: limits on primodial non-gaussianity
(American Physical Society, 2013)The large-scale structure of the Universe supplies crucial information about the physical processes at play at early times. Unresolved maps of the intensity of 21 cm emission from neutral hydrogen HI at redshifts z ~ 1 − ... -
Cosmology with a SKA HI intensity mapping survey
(Proceedings of Science, 2014)HI intensity mapping (IM) is a novel technique capable of mapping the large-scale structure of the Universe in three dimensions and delivering exquisite constraints on cosmology, by using HI as a biased tracer of the ... -
Cosmology with Phase 1 of the Square Kilometre Array Red Book 2018: Technical specifications and performance forecasts
(Cambridge University Press, 2020)We present a detailed overview of the cosmological surveys that we aim to carry out with Phase 1 of the Square Kilometre Array (SKA1) and the science that they will enable. We highlight three main surveys: a medium-deep ... -
Cosmology with photometrically classified type IA supernovae from the SDSS-II supernova survey
(The American Astronomical Society, 2013)We present the cosmological analysis of 752 photometrically–classified Type Ia Supernovae (SNe Ia) obtained from the full Sloan Digital Sky Survey II (SDSS-II) Supernova (SN) Survey, supplemented with host–galaxy ... -
COSMOS2020: A panchromatic view of the universe to z ∼ 10 from two complementary catalogs
(University of the Western Cape, 2022)The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This ... -
Cosmos2020: A panchromatic view of the universe to z∼10 from two complementary catalogs
(IOP Publishing, 2022)The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This ... -
Cost of Traditional Herbal Medicines for Noncommunicable Diseases in Rural and Urban Communities in South Africa
(Elsevier Inc., 2022)Objectives: This study assessed traditional herbal medicine (THM) and conventional medicine (CM) utilization among par- participants with a noncommunicable diseases in South Africa. Methods: A cross-sectional study of the ... -
Coulomb excitation of 102 Ru with 12 C and 16 O
(American Physical Society, 2022)The Coulomb excitation of 102Ru was performed with beams of 12C and 16O ions. The beam particles scattered at forward angles were momentum analyzed with a magnetic spectrograph. The resolution achieved enabled the ... -
Coulomb excitation of and a change in structure approaching N = Z = 40
(American Physical Society, 2021)Background: Nuclei approaching are known to exhibit strongly deformed structures and are thought to be candidates for shape coexistence. In the krypton isotopes, are poorly characterized, preventing an understanding of ... -
Couple asymmetries and modern contraceptive use among young married women in Nigeria
(Sociological Demography Press, 2023)Nigeria is faced with high fertility, maternal and child mortality, and a rapid population growth rate. The uptake of modern methods of contraception is crucial to reduce the high fertility rate, halt population growth, ... -
Covid-19 among adults living with HIV: Correlates of mortality among public sector healthcare users in Western Cape, South Africa
(Wiley, 2023)Introduction: While a large proportion of people with HIV (PWH) have experienced SARS-CoV-2 infections, there is uncertainty about the role of HIV disease severity on COVID-19 outcomes, especially in lower-income settings. ... -
Covid-19 and cancer therapy: Interrelationships and management of cancer cases in the era of Covid-19
(Hindawi, 2021)'e COVID-19 global epidemic poses this generation’s biggest worldwide public health challenge probably since the 1918 influenza epidemic. Recent reports on two new variants have triggered a dramatic upsurge in research ...