Browsing Research Articles (Physics) by Title
Now showing items 455-474 of 520
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SKAO HI intensity mapping: blind foreground subtraction challenge
(University of the Western Cape, 2022)Neutral Hydrogen Intensity Mapping (H I IM) surveys will be a powerful new probe of cosmology. However, strong astrophysical foregrounds contaminate the signal and their coupling with instrumental systematics further ... -
The slow flow model of dust eflux in local star-forming galaxies
(Oxford University Press, 2013)We develop a dust efflux model of radiation pressure acting on dust grains which successfully reproduces the relation between stellar mass, dust opacity and star forma- tion rate observed in local star-forming galaxies. ... -
SN Ia host galaxy properties from Sloan Digital Sky Survey-II spectroscopy
(Oxford University Press, 2013)We study the stellar populations of Type Ia supernova (SN Ia) host galaxies using Sloan Digital Sky Survey (SDSS)-II spectroscopy. The main focus is on the relationships of SN Ia properties with stellar velocity dispersion ... -
Solar irradiance spectra from the compact SOLSTICE (CSOL) experiment: instrument design, FUV calibration, measurements, and comparison of the 2018 rocket flight
(Solar Physics, 2023)The Compact SOLSTICE, a compact far and mid ultraviolet (FUV and MUV) spectrograph, flew on a sounding rocket on 18 June 2018 to validate and potentially calibrate the SOLar STellar Irradiance Comparison Experiment (SOLSTICE) ... -
Solar irradiance spectra from the compact SOLSTICE (CSOL) experiment: Instrument design, FUV calibration, measurements, and comparison of the 2018 rocket flight
(Springer, 2023)The Compact SOLSTICE, a compact far and mid ultraviolet (FUV and MUV) spectrograph, flew on a sounding rocket on 18 June 2018 to validate and potentially calibrate the SOLar STellar Irradiance Comparison Experiment ... -
Solar-Cycle Variability Results fromthe Solar Radiation and Climate Experiment (SORCE) Mission
(Springer, 2022)The Solar Radiation and Climate Experiment (SORCE) was a NASA mission that operated from 2003 to 2020 to provide key climate-monitoring measurements of total solar irradiance (TSI) and solar spectral irradiance (SSI). ... -
Solid state dewetting of a metal –semiconductor bi-layers deposited onto c-Si substrate
(Springer, 2023)A bi-layers stack consisting of a semiconductor thin film of a varied thickness and a very thin Pd layer (SiC/Pd/c-Si).was deposited onto c-Si by e-beam evaporation at room temperature. The multi-layers structure was ... -
Spectral age distribution for radio-loud active galaxies in the XMM-LSS field
(Monthly Notices of the Royal Astronomical Society, 2023)Jets of energetic particles, as seen in FR type-I and FR type-II sources, ejected from the centre of radio-loud AGN affect the sources surrounding the intracluster medium/intergalactic medium. Placing constraints on the ... -
A spectroscopic analysis of the eclipsing nova-like EC 21178−5417 – discovery of spiral density structures
(Oxford University Press, 2020)We present phase-resolved optical spectroscopy of the eclipsing nova-like cataclysmic variable EC 21178−5417 obtained between 2002 and 2013. The average spectrum of EC 21178−5417 shows broad double-peaked emission lines ... -
Spectroscopic and electrochemical exploration of carbon-infused intercalation-type spinel composite for aqueous systems
(Frontiers Media, 2022)Lithium-manganese-based compounds are promising intercalation host materials for aqueous battery systems due to their synergy with high ionic conductive aqueous electrolytes, safety, eco-friendliness, and low cost. Yet, ... -
Spectroscopic studies of neutron-rich in 129 and its β -decay daughter, Sn 129, using the GRIFFIN spectrometer
(American Physical Society, 2021)The β decay of neutron-rich In129 into Sn129 was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the β-decaying isomers. The level ... -
Spectroscopy of states in Ba 136 using the Ba 138 (p,t) reaction
(American Physical Society, 2021)Background: The Ba136 isotope is the daughter nucleus in Xe136ββ decay. It also lies in a shape transitional region of the nuclear chart, making it a suitable candidate to test a variety of nuclear models. Purpose: To ... -
Spin coating immobilisation of C-N-TiO2 Co-Doped nano catalyst on glass and application for photocatalysis or as electron transporting layer for perovskite solar cells
(MDPI, 2020)Producingactivethinfilmscoatedonsupportsresolvesmanyissuesofpowder-basedphoto catalysis and energy harvesting. In this study, thin films of C-N-TiO2 were prepared by dynamic spin coating of C-N-TiO2 sol-gel on glass support. ... -
A spitzer survey of deep drilling fields to be targeted by the Vera C. Rubin observatory legacy survey of space and time
(Oxford University Press, 2021)The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will observe several Deep Drilling Fields (DDFs) to a greater depth and with a more rapid cadence than the main survey. In this paper, we describe the ... -
Stacked reverberation mapping
(Oxford University Press, 2013)Over the past 20 years reverberation mapping has proved one of the most successful techniques for studying the local (<1 pc) environment of supermassive black holes that drive active galactic nuclei. Key successes of ... -
Star formation history of 0 . 1 ≤z ≤1 . 5 mass-selected galaxies in the ELAIS-N1 Field
(Oxford University Press [Commercial Publisher] Royal Astronomical Society [Society Publisher], 2023)We measure the specific star formation rates (sSFRs) of K-band selected galaxies from the European Large Area ISO Survey North 1 by stacking Giant Metrewave Radio Telescope data at 610 MHz. We identify a sample of star-forming ... -
The star formation rates of QSOs
(Royal Astronomical Society, 2022)We examine the far-IR properties of a sample of 5391 optically selected QSOs in the 0.5 < z < 2.65 redshift range down to log [νLν,2500(erg/s)] > 44.7, using SPIRE data from Herschel-ATLAS. We split the sample in a grid ... -
The star-formation history of mass-selected galaxies from the VIDEO survey
(Oxford University Press, 2014)We measure star formation rates (SFRs) and specific SFRs (SSFRs) of Ks-selected galaxies from the VISTA Deep Extragalactic Observations survey by stacking 1.4 GHz Very Large Array data. We split the sample, which spans 0 ... -
Statistical gamma-ray decay studies at iThemba LABS
(EDP Sciences, 2017)Abstract. A program to study the γ -ray decay from the region of high-level density has been established at iThemba LABS, where a high-resolution gamma-ray detector array is used in conjunction with silicon particle-telescopes. ... -
Statistical recovery of 21 cm visibilities and their power spectra with gaussian-constrained realizations and gibbs sampling
(The Astrophysical Journal Supplement Series, 2023)Radio interferometers designed to probe the 21 cm signal from Cosmic Dawn and the Epoch of Reionization must contend with systematic effects that make it difficult to achieve sufficient dynamic range to separate the 21 cm ...