Browsing Research Articles (Physics) by Title

Now showing items 326-345 of 510

    • A new sample of southern radio galaxies: Host-galaxy masses and star-formation rates 

      Marubini, Takalani (Oxford University Press, 2019)
      In this study we define a new sample of distant powerful radio galaxies in order to study their host galaxy properties and provide targets for future observations of H I absorption with new radio telescopes and to understand ...

    • A new technique to isolate kinematically anomalous gas in HI data cubes 

      Randriamiarinarivo, N; Elson, E. C.; Baker, A. J. (Oxford University Press, 2023)
      H I line observations of nearby galaxies often reveal the presence of extraplanar and/or kinematically anomalous gas that deviates from the general circular flow. In this work, we study the dependence of kinematically ...

    • News from the EREBOS project 

      Schaffenroth, Veronika; Barlow, Brad; Geier, Stephan; Vučković, Maja; Kilkenny, Dave; Schaffenroth, Johannes (De Gruyter Open, 2017)
      Planets and brown dwarfs in close orbits will interact with their host stars, as soon as the stars evolve to become red giants. However, the outcome of those interactions is still unclear. Recently, several brown dwarfs ...

    • nIFTy galaxy cluster simulations – V. Investigation of the cluster infall region 

      Arthur, Jake; Pearce, Frazer R.; Gray, Meghan E.; Elahi, Pascal J.; Knebe, Alexander; Beck, Alexander M.; Cui, Weiguang; Cunnama, Daniel; Dave, Romeel (Oxford University Press, 2016)
      We examine the properties of the galaxies and dark matter haloes residing in the cluster infall region surrounding the simulated cold dark matter galaxy cluster studied by Elahi et al. at z = 0. The 1.1 × 1015 h−1M ...

    • NIFTY galaxy cluster simulations – VI. The dynamical imprint of substructure on gaseous cluster outskirts 

      Cunnama, D.; Power, C.; Elahi, P. J. (Oxford University Press, 2019)
      Galaxy cluster outskirts mark the transition region from the mildly non-linear cosmic web to the highly non-linear, virialized, cluster interior. It is in this transition region that the intracluster medium (ICM) begins ...

    • Nitrogen plasma treatment of zno and tio2 nanowire arrays for polymer photovoltaic applicationS 

      Muhammad, Bello Ladan (ScienceDirect, 2019)
      This work reports on a simple, yet unique approach to improving the opto-electronic properties of vertically-aligned arrays of rutile TiO2 and Wurzite ZnO nanowires by means of controlled nitrogen doping during exposure ...

    • NOEMA redshift measurements of bright Herschel galaxies 

      Marchetti, L.; Neri, R.; Cox, P. (EDP Sciences, 2020)
      Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey with S500 μm ≥ 80 mJy. We report reliable ...

    • Non-booking for antenatal care and risks for vertical HIV transmission among women in Chitungwiza, Zimbabwe: a cross-sectional study 

      Schaay, Nikki; Lembani, Martina; Mandima, Patricia; Ngara, Bernard (BMC Pregnancy and Childbirth, 2022)
      Background: The success of prevention of mother to child transmission of HIV (PMTCT) programs dependents on pregnant women accessing antenatal care (ANC) services. Failure to access ANC throughout the course of pregnancy ...

    • Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique 

      Camera, Stefano; Gomes, Zahra; Jarvis, Matt J. (Oxford University Press, 2019)
      Tighter constraints on measurements of primordial non-Gaussianity (PNG) will allow the differentiation of inflationary scenarios. The cosmic microwave background bispectrum – the standard method of measuring the local ...

    • Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys 

      Ballardini, Mario; Murgia, Riccardo; Baldi, Marco (IOP Publishing Ltd, 2020)
      Galaxy surveys are an important probe for superimposed oscillations on the primordial power spectrum of curvature perturbations, which are predicted in several theoretical models of inflation and its alternatives. In order ...

    • Nonlinear galactic dynamos and the magnetic pitch angle 

      Chamandy, Luke; Taylor, A. Russ (American Astronomical Society, 2015)
      Pitch angles p of the large-scale magnetic fields B of spiral galaxies have previously been inferred from observations to be systematically larger in magnitude than predicted by standard mean-field dynamo theory. ...

    • Nonlinear modulation of the HI power spectrum on ultra-large scales. I 

      Umeh, Obinna; Maartens, Roy; Santos, Mario G. (IOP Science, 2015)
      Intensity mapping of the neutral hydrogen brightness temperature promises to provide a three-dimensional view of the universe on very large scales. Nonlinear effects are typically thought to alter only the small-scale ...

    • A null test to probe the scale dependence of the growth of structure as a test of general relativity 

      Clarkson, Chris; Franco, Felipe Oliveira; Bonvin, Camille (Oxford University Press, 2019)
      The main science driver for the coming generation of cosmological surveys is understanding dark energy that relies on testing general relativity on the largest scales. Once we move beyond the simplest explanation for dark ...

    • 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 ...

    • Null tests of the cosmological constant using supernovae 

      Yahya, Sahba; Seikel, Marina; Clarkson, Chris; Maartens, Roy; Smith, Mathew (American Physical Society, 2014)
      The standard concordance model of the Universe is based on the cosmological constant as the driver of accelerating expansion. This concordance model is being subjected to a growing range of inter-locking observations. ...

    • 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 ...

    • The observation of vibrating pear-shapes in radon nuclei 

      Kenzo, Abrahams (nature communications, 2019)
      There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate ...

    • The observed galaxy bispectrum from single-field inflation in the squeezed limit 

      Koyama, Kazuya; Umeh, Obinna; Maartens, Roy; Bertacca, Daniele (IOP Publishing, 2018)
      Using the consistency relation in Fourier space, we derive the observed galaxy bispectrum from single- eld in ation in the squeezed limit, in which one of the three modes has a wavelength much longer than the other two. ...

    • Observing relativistic features in large-scale structure surveys - I. Multipoles of the power spectrum 

      Bull, P; Guandalin, C; Adamek, J (Oxford University Press, 2021)
      Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation and the possibility of constraining novel ...

    • Observing relativistic features in large-scale structure surveys - I. Multipoles of the power spectrum 

      Bull, P; Guandalin, C; Adamek, J (Oxford University Press, 2021)
      Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation and the possibility of constraining novel ...