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Black Holes 'NSinc: The SA discovery that’s got astronomers in a spin

A deep scan of the sky in radio waves revealed something completely unexpected to South African astronomers: that somehow, and for some unexplained reason, supermassive black holes in one region of space are all releasing radio waves in the same direction. Could this be a vital clue in understanding how the universe was formed?

Astronomers Perplexed By Rare Alignment Of Supermassive Black Holes (Youtube video)

Centre For RadioCosmology: Astronomy For The 21st Century

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  • MIGHTEE-HI: discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT 

    Ranchod, Shilpa; Deane, Roger; Ponomareva, Anastasia (Monthly Notices of the Royal Astronomical Society, 2021)
    We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in HI in this z ∼ 0.044 group, with a 3σ column density sensitivity of NHI = ...
  • Statistical recovery of the BAO scale from multipoles of the beam-convolved 21 cm correlation function 

    Kennedy, F.; Bull, P. (Royal Astronomical Society, 2021)
    Despite being designed as an interferometer, theMeerKAT radio array (a Square Kilometre Array pathfinder) can also be used in autocorrelation (‘single-dish’) mode, where each dish scans the sky independently. Operating ...
  • Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon 

    Schneider, J.; Ziegler, T.; Wagenpfeil, M. (IOP Publishing, 2021)
    Silicon photomultipliers are regarded as a very promising technology for nextgeneration, cutting-edge detectors for low-background experiments in particle physics. This work presents systematic reflectivity studies of ...
  • Null tests of the concordance model in the era of Euclid and the SKA 

    Bengaly, Carlos; Clarkson, Chris; Kunz, Martin; Maartens, Roy (Elsevier, 2021)
    We perform null tests of the concordance model, using H (z) measurements that mimic next-generation surveys such as Euclid and the SKA. To this end, we deploy a non-parametric method, so that we make minimal assumptions ...
  • Pulsars with NenuFAR: Backend and pipelines 

    Bondonneau, L.; Theureau, G.; Cognard, I.; Brionne, M. (EDP Sciences, 2021)
    Context. NenuFAR (New extension in Nançay upgrading LOFAR) is a new radio telescope developed and built on the site of the Nançay Radio Observatory. It is designed to observe the largely unexplored frequency window from ...
  • The effect of finite halo size on the clustering of neutral hydrogen. 

    Umeh, O; Maartens, R; Camera, S (IOP, 2021)
    Post-reionisation 21cm intensity mapping experiments target the spectral line of neutral hydrogen (HI) resident in dark matter haloes. According to the halo model, these discrete haloes trace the continuous dark matter ...
  • Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum 

    Koyama, K; Crittenden, R; Umeh, O (IOP, 2021)
    One of the cornerstones of general relativity is the equivalence principle. However, the validity of the equivalence principle has only been established on solar system scales for standard matter fields; this result ...
  • Synthesis, characterization and ab initio study of WO3 nanocubes with peculiar electrochemical properties 

    Bashir, A. K.H; Morad, R; Nwanya, A. C; Akbari, M; Sackey, J; Kaviyarasu, K; Madiba, I. G; Ezema, F. I; Maaza, M (Springer, 2021)
    Simple sol–gel method has been exploited to deposit Sn-doped TiO2 thin flms on glass substrates. The resultant coatings were characterized by X-ray difraction (XRD), UV–visible techniques (UV–Vis), Fourier transform ...
  • Synthesis and characterization of Sn‑doped TiO2 flm for antibacterial applications 

    Kaviyarasu. K; Maaza. M; Bashir. K.H; Rajeswari.R; John Sundaram; Dhayal Raj; Amal George; D. Venugopal (Springer, 2021)
    Simple sol–gel method has been exploited to deposit Sn-doped TiO2 thin flms on glass substrates. The resultant coatings were characterized by X-ray difraction (XRD), UV–visible techniques (UV–Vis), Fourier transform ...
  • Statistical gamma-ray decay studies at iThemba LABS 

    M. Wiedeking; L.A. Bernstein; D.L. Bleuel; C.P. Brits; K. Sowazi; A. Gorgen; L. Goldblum; B.R. Zikhali; S. Siem; T. Nogwanya; M. Guttormsen; D. Negi (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. ...
  • Relativistic mean field formulation of clustering in heavy nuclei 

    S.M. Wyngaardt; H. W. Groenewald; T.T Ibrahim; J. Ndayishimye; S.M. Perez (IOP, 2010)
    Very little is known about clustering in heavy nuclei and in particular the interaction between the correlated cluster nucleons and remaining core nucleons. Currently the phenomenological Saxon-Woods plus cubic Saxon-Woods ...
  • Observation of the 0+ 2 and γ bands in 98Ru, and shape coexistence in the Ru isotopes 

    Garrett, P.E; Makhathini, L.; Bark, R.A; Rodríguez, T.R.; Valbuena, S.; Wirth, H.F.; Vyfers, E.C.; Triambak, S.; Singh, B.; Rebeiro, B.; Orce, J.N; Nzobadila Ondze, J.C.; Ntshangase, S.S.; Ngwetsheni, C.; Mukwevho, N.J.; Mthembu, S.H.; Mehl, C.; Lawrie, E.A; MacLean, A.D.; Leach, K.G; Lawrie, E.A.; R., Kamil; R. Dubey; T. Faestermann; C. Burbadge; T.D. Bucher (Elsevier, 2020)
    Excited states in 98Ru were investigated using γ-ray spectroscopy following the β-decay of 98Rh, and via the 100Ru(p,t) reaction. Combining the results from the two experiments, two states were revised to have spin-parity ...
  • Modern African nuclear detector laboratory: Development of state-of-the-art in-house detector facility at the University of the Western Cape 

    Kapoor, K.; Orce, J.N; Abrahams, K; Akakpo, E; Bester, Z; Jenkins, D.G; Jordaan, K.L; Jones, M.Y.; Kamedien, M.A.; Lindsay, R.; Lomberg, B; Masango, S.; Ngwetsheni, C.; Ntshangase, S.S.; Radebe, N.; Triambak, S; Zyl, J.J. van, (SpringerLink, 2021)
    The upcoming detector facility aims at developing new state-of-the-art particle detectors as well as providing hands-on training to postgraduate students using both analog and digital signal processing from nuclear radiation ...
  • Investigation of pair-correlated 0+ states in Ba 134 via the Ba 136 (p,t) reaction 

    J. C. Nzobadila, Ondze; Rebeiro, B. M; S, Triambak; Atar, L; Ball, G.C; Bildstein, V; Burbadge, C; Varela, A. Diaz; Faestermann, T; Garrett, P. E.; Hertenberger, R.; Kamil, M.; Lindsay, R.; Orce, J. N.; Radich, A.; Wirth, H. -F (American Physical Society, 2020-12-12)
    We performed a high resolution study of 0+ states in Ba134 using the Ba136(p,t) two-neutron transfer reaction. Our experiment shows a significant portion of the L=0 pair-transfer strength concentrated at excited 0+ levels ...
  • A deep radio view of the evolution of the cosmic star-formation rate density from a stellar-mass selected sample in VLA-COSMOS 

    Malefahlo, Eliab; Jarvis, Matt; Santos, Mario (2020)
    We present the 1.4 GHz radio luminosity functions (RLFs) of galaxies in the COS- MOS eld, measured above and below the 5 detection threshold, using a Bayesian model- tting technique. The radio ux-densities from VLA-COSMOS ...
  • Predicting coronary artery disease risk in firefighters – a cross-sectional study 

    Ras, Jaron; Leach, Lloyd (2021-07-30)
    Background: Firefighters are placed under severe cardiovascular load in performing active duty and, when carrying various coronary artery disease (CAD) risk factors, firefighters are predisposed to significant morbidity ...
  • A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS 

    Gu, Liyi; Wang, Yu; Zhang, Zhongli (2009)
    By analyzing the gas temperature maps created from the Chandra archive data, we reveal the prevailing existence of temperature substructures on ∼ 100 h −1 70 kpc scales in the central regions of nine intermediate-redshift ...
  • A New Model For Including Galactic Winds in Simulations of Galaxy Formation II: Implementation of PhEW in Cosmological Simulations 

    Huang, Shuiyao; Katz, Neal; Dave, Romeel (Monthly Notices of the Royal Astronomical Society, 2021)
    Although galactic winds play a critical role in regulating galaxy formation, hydrodynamic cosmological simulations do not resolve the scales that govern the interaction between winds and the ambient circumgalactic medium ...
  • An orientation bias in observations of submillimetre galaxies 

    Lovell, C; Geach, J; Davé, R (Monthly Notices of the Royal Astronomical Society, 2021)
    Recent high-resolution interferometric images of submillimetre galaxies (SMGs) reveal fascinatingly complex morphologies. This raises a number of questions: how does the relative orientation of a galaxy affect its observed ...
  • Chemical Vapor Deposited Mixed Metal Halide Perovskite Thin Films 

    Magubane, Siphesihle; Arendse, Christopher; Ngqoloda, Siphelo (Materials, 2021)
    In this article, we used a two-step chemical vapor deposition (CVD) method to synthesize methylammonium lead-tin triiodide perovskite films, MAPb1−xSnxI3, with x varying from 0 to 1. We successfully controlled the concentration ...

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