Browsing by Author "Irwin, Michael J."

Now showing items 1-7 of 7

  • A kinematic study of the Andromeda dwarf spheroidal system 

    Collins, Michelle L. M.; Chapman, Scott C.; Rich, R. Michael; Ibata, Rodrigo A.; Martin, Nicolas F.; Irwin, Michael J.; Bate, Nicholas F.; Lewis, Geraint F.; Peñarrubia, Jorge; Arimoto, Nobuo; Casey, Caitlin M.; Ferguson, Annette M. N.; Koch, Andreas; McConnachie, Alan W.; Tanvir, Nial (2013-02-26)
    We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEIMOS spectrographs. Based on their g-i ...

  • The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties 

    Ibata, Rodrigo A.; Lewis, Geraint F.; McConnachie, Alan W.; Martin, Nicolas F.; Irwin, Michael J.; Ferguson, Annette M. N.; Babul, Arif; Bernard, Edouard J.; Chapman, Scott C.; Collins, Michelle; Fardal, Mark; Mackey, A. D.; Navarro, Julio; Penarrubia, Jorge; Rich, R. Michael; Tanvir, Nial; Widro, Lawrence (2013-11-22)
    We present an analysis of the large-scale structure of the halo of the Andromeda galaxy, based on the Pan-Andromeda Archeological Survey (PAndAS), currently the most complete map of resolved stellar populations in any ...

  • The masses of Local Group dwarf spheroidal galaxies: The death of the universal mass profile 

    Collins, Michelle L. M.; Chapman, Scott C.; Rich, R. M.; Ibata, Rodrigo A.; Martin, Nicolas F.; Irwin, Michael J.; Bate, Nicholas F.; Lewis, Geraint F.; Peñarrubia, Jorge; Arimoto, Nobuo; Casey, Caitlin M.; Ferguson, Annette M. N.; Koch, Andreas; McConnachie, Alan W.; Tanvir, Nial (2013-09-12)
    We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the Galaxy. By folding in kinematic information for 25 ...

  • PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33 

    Lewis, Geraint F.; Braun, Robert; McConnachie, Alan W.; Irwin, Michael J.; Ibata, Rodrigo A.; Chapman, Scott C.; Ferguson, Annette M. N.; Martin, Nicolas F.; Fardal, Mark; Dubinski, John; Widrow, Larry; Mackey, A. Dougal; Babul, Arif; Tanvir, Nial; Rich, Michael (2012-11-16)
    Large scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ...

  • The Star Formation History and Dust Content in the Far Outer Disc of M31 

    Bernard, Edouard J.; Ferguson, Annette M. N.; Barker, Michael K.; Hidalgo, Sebastian L.; Ibata, Rodrigo A.; Irwin, Michael J.; Lewis, Geraint F.; McConnachie, Alan W.; Monelli, Matteo; Chapman, Scott C. (2011-11-22)
    We present a detailed analysis of two fields located 26 kpc (~5 scalelengths) from the centre of M31. One field samples the major axis populations--the Outer Disc field--while the other is offset by ~18' and samples the ...

  • Submillimeter Observations of the Ultraluminous BAL Quasar APM 08279+5255 

    Lewis, Geraint F.; Chapman, Scott C.; Ibata, Rodrigo A.; Irwin, Michael J.; Totten, Edward J. (1998-9-20)
    With an inferred bolometric luminosity of $5\times10^{15}{\rm \lsun}$, the recently identified z=3.87, broad absorption line quasar APM 08279+5255 is apparently the most luminous object currently known. As half of its ...

  • The Three-Dimensional Structure of the M31 Satellite System; Strong Evidence for an Inhomogeneous Distribution of Satellites 

    Conn, Anthony R.; Lewis, Geraint F.; Ibata, Rodrigo A.; Parker, Quentin A.; Zucker, Daniel B.; McConnachie, Alan W.; Martin, Nicolas F.; Valls-Gabaud, David; Tanvir, Nial; Irwin, Michael J.; Ferguson, Annette M. N.; Chapman, Scott C. (2013-01-29)
    We undertake an investigation into the spatial structure of the M31 satellite system utilizing the distance distributions presented in a previous publication. These distances make use of the unique combination of depth and ...