Now showing items 1-10 of 10

    • Abundance ratios and IMF slopes in the dwarf elliptical galaxy NGC 1396 with MUSE 

      Mentz, J.J.; Loubser, S.I.; La Barbera, F.; Peletier, R.F.; Falcón-Barroso, J. (Oxford Univ Press, 2016)
      Deep observations of the dwarf elliptical (dE) galaxy NGC 1396 (MV = −16.60, Mass ∼4 × 108 M⊙), located in the Fornax cluster, have been performed with the Very Large Telescope/Multi Unit Spectroscopic Explorer spectrograph ...
    • Abundance ratios in dwarf elliptical galaxies 

      Sen, S.; Mentz, J.J.; Peletier, R.F.; Boselli, A.; Den Brok, M. (Oxford Univ Press, 2018)
      We determine abundance ratios of 37 dwarf ellipticals (dEs) in the nearby Virgo cluster. This sample is representative of the early-type population of galaxies in the absolute magnitude range −19.0 < Mr < −16.0. We analyse ...
    • Age-dating luminous red galaxies observed with the Southern African Large Telescope 

      Ratsimbazafy, A.L.; Loubser, S.I.; Crawford, S.M.; Cress, C.M.; Bassett, B.A.; Vaisanen, P. (Oxford Univ Press, 2017)
      We measure a value for the cosmic expansion of H(z) = 89 ± 23(stat) ± 44(syst) km s−1 Mpc−1 at a redshift of z ≃ 0.47 based on the differential age technique. This technique, also known as cosmic chronometers, uses the age ...
    • The close pair fraction of BCGs since z = 0.5: major mergers dominate recent BCG stellar mass growth 

      Groenewald, Danièl N.; Loubser, S. Ilani; Skelton, Rosalind E.; Gilbank, David G. (Oxford Univ Press, 2017)
      Using the redMaPPer (red-sequence Matched-filter Probabilistic Percolation) cluster catalogue based on the Sloan Digital Sky Survey (SDSS) photometry, we investigate the importance of major mergers in the stellar mass ...
    • Detection of large-scale Ly α absorbers at large angles to the radio axis of high-redshift radio galaxies using SOAR 

      Silva, M.; Lagos, P.; Humphrey, A.; Guimarâes, R.; Scott, T. (Oxford Univ Press, 2018)
      We present an investigation of the properties of the extended Ly α halo and the large-scale H I absorbing structures associated with five high-redshift radio galaxies at z > 2, using the Goodman long-slit spectrograph ...
    • Did brightest cluster galaxies experience more than one star formation epoch? 

      Viljoen, D.N.; Loubser, S.I. (Cambridge University Press, 2012)
      We use the full spectrum fitting ability of ULySS, with the Pegase.HR stellar population model to fit the observed spectra of 40 brightest cluster galaxies in order to determine whether a single or a composite stellar ...
    • Enhanced H I profile asymmetries in close galaxy pairs 

      Bok, J.; Gilbank, D.G.; Blyth, S.-L.; Elson, E.C. (Oxford Univ Press, 2019)
      Analysing the quantified H I profile asymmetries of galaxies in different environments, we explore not only the prevalence of asymmetry in H I profiles, but also the possibility of using H I profile asymmetries to trace ...
    • Gemini observations of galaxies in rich early environments (GOGREEN) I: survey description 

      Balogh, Michael L.; Gilbank, David G.; Muzzin, Adam; Rudnick, Gregory; Cooper, Michael C. (Oxford Univ Press, 2017)
      We describe a new Large Program in progress on the Gemini North and South telescopes: Gemini Observations of Galaxies in Rich Early Environments (GOGREEN). This is an imaging and deep spectroscopic survey of 21 galaxy ...
    • Investigating the star formation histories of the brightest cluster galaxies 

      Groenewald, D.N.; Loubser, S.I. (Oxford Univ Press, 2014)
      This article is devoted to the study of the central stellar populations of the brightest cluster galaxies (BCGs). High signal-to-noise ratio, long-slit spectra for a sample of 39 galaxies were fitted against two stellar ...
    • Neutral hydrogen and magnetic fields in M83 observed with the SKA Pathfinder KAT-7 

      Heald, G.; Oozeer, N.; De Blok, W.J.G.; Lucero, D.; Carignan, C. (Oxford Univ Press, 2016)
      We present new KAT-7 observations of the neutral hydrogen (H i) spectral line, and polarized radio continuum emission, in the grand-design spiral M83. These observations provide a sensitive probe of the outer-disc structure ...