Now showing items 1-8 of 8

  • Dark matter halo properties of GAMA galaxy groups from 100 square degrees of KiDS weak lensing data 

    Viola, M.; Cacciato, M.; Brouwer, M.; Kuijken, K.; Hoekstra, H.; Norberg, P.; Robotham, Aaron Stuart Graham; Van Uitert, E.; Alpaslan, Mehmet; Baldry, I.K.; Choi, A.; De Jong, J.T.A.; Driver, Simon Peter; Erben, T.; Grado, A.; Graham, A.W.; Heymans, C.; Hildebrandt, H.; Hopkins, A.M.; Irisarri, N.; Joachimi, B.; Loveday, J.; Miller, L.; Nakajima, R.; Schneider, P.; Sifón, C.; Verdoes Kleijn, G. (2015-10-01) - Journal article
    The Kilo-Degree Survey is an optical wide-field survey designed to map the matter distribution in the Universe using weak gravitational lensing. In this paper, we use these data to measure the density profiles and masses ...
  • Dynamical history of the Local Group in ΛCDM 

    Banik, Indranil; Zhao, Hongsheng (2016-06-21) - Journal article
    The positions and velocities of galaxies in the Local Group (LG) measure the gravitational field within it. This is mostly due to the Milky Way (MW) and Andromeda (M31). We constrain their masses using distance and radial ...
  • Effects of lens motion and uneven magnification on image spectra 

    Banik, Indranil; Zhao, Hongsheng (2015-07-01) - Journal article
    Counter to intuition, the images of an extended galaxy lensed by a moving galaxy cluster should have slightly different spectra in any metric gravity theory. This is mainly for two reasons. One relies on the gravitational ...
  • Extragalactic and cosmological tests of gravity theories with additional scalar or vector fields 

    Feix, Martin (University of St Andrews, 2011-06-24) - Thesis
    Despite the many successes of the current standard model of cosmology on the largest physical scales, it relies on two phenomenologically motivated constituents, cold dark matter and dark energy, which account for approximately ...
  • The low dark matter content of the lenticular galaxy NGC 3998 

    Boardman, N. F.; Weijmans, A.; Bosch, R. C. E. van den; Zhu, L.; Yildirim, A.; Ven, G. van de; Cappellari, M.; Zeeuw, P. T. de; Emsellem, E.; Krajnović, D.; Naab, T. (2016-08-11) - Journal article
    We observed the lenticular galaxy NGC 3998 with the Mitchell Integral-Field Spectrograph and extracted line-of-sight velocity distributions out to three half-light radii. We constructed collisionless orbit models in order ...
  • The M31 pixel lensing plan campaign : macho lensing and self-lensing signals 

    Calchi Novati, S.; Bozza, V.; Bruni, I.; Dall'Ora, M.; De Paolis, F.; Dominik, M.; Gualandi, R.; Ingrosso, G.; Jetzer, P.; Mancini, L.; Nucita, A.; Safonova, M.; Scarpetta, G.; Sereno, M.; Strafella, F.; Subramaniam, A.; Gould, A. (2014-03-10) - Journal article
    We present the final analysis of the observational campaign carried out by the PLAN (Pixel Lensing Andromeda) collaboration to detect a dark matter signal in form of MACHOs through the microlensing effect. The campaign ...
  • Modified Newtonian dynamics at all astrophysical scales 

    Angus, Garry W. (University of St Andrews, 2008-11-27) - Thesis
    In this thesis I test the modified Newtonian dynamics as an alternative to the cold dark matter hypothesis. In the Milky Way, I show that the dynamics of the dwarf galaxies are well described by the paradigm and I confirm ...
  • On gravity : a study of analytical and computational approaches to problem solving in collisionless systems 

    Barber, Jeremy A. (University of St Andrews, 2014-12-01) - Thesis
    I present an overview of the tools and methods of gravitational dynamics motivated by a variety of dynamics problems. Particular focus will be given to the development of dynamic phase-space configurations as well as the ...