Browsing Faculty of Science by Author "Ibata, R. A."

Now showing items 1-12 of 12

  • Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group 

    Mackey, A. D.; Ferguson, A. M. N.; Irwin, M. J.; Martin, N. F.; Huxor, A. P.; Tanvir, N. R.; Chapman, S. C.; Ibata, R. A.; Lewis, G. F.; McConnachie, A. W. (2009-09-08)
    We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour-magnitude diagram for this object extends ~5 magnitudes below the tip of the red giant branch and exhibits features ...

  • Discovery and analysis of three faint dwarf galaxies and a globular cluster in the outer halo of the Andromeda galaxy 

    Martin, N. F.; Ibata, R. A.; Irwin, M. J.; Chapman, S.; Lewis, G. F.; Ferguson, A. M. N.; Tanvir, N.; McConnachie, A. W. (2006-10-01)
    We present the discovery of three faint dwarf galaxies and a globular cluster in the halo of the Andromeda galaxy (M31), found in our MegaCam survey that spans the southern quadrant of M31, from a projected distance of ~50 ...

  • Dynamics in the satellite system of Triangulum: Is AndXXII a dwarf satellite of M33? 

    Chapman, S. C.; Widrow, L.; Collins, M. L. M.; Dubinski, J.; Ibata, R. A.; Penarrubia, J.; Rich, M.; Ferguson, A. M. N.; Irwin, M. J.; Lewis, G. F.; Martin, N.; McConnachie, A.; Tanvir, N. (2012-06-25)
    We present results from a spectroscopic survey of the dwarf spheroidal And XXII and the two extended clusters EC1 and EC2. These three objects are candidate satellites of the Triangulum galaxy, M33, which itself is likely ...

  • Exploring the Properties of the M31 Halo Globular Cluster System 

    Huxor, A. P.; Ferguson, A. M. N.; Tanvir, N. R.; Irwin, M. J.; Mackey, A. D.; Ibata, R. A.; Bridges, T.; Chapman, S. C.; Lewis, G. F. (2011-02-02)
    Following on from our discovery of a significant population of M31 outer halo globular clusters (GCs), and updates to the Revised Bologna Catalogue of M31 GCs, we investigate the GC system of M31 out to an unprecedented ...

  • An HST/ACS View of the Inhomogeneous Outer Halo of M31 

    Richardson, J. C.; Ferguson, A. M. N.; Mackey, A. D.; Irwin, M. J.; Chapman, S. C.; Huxor, A.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. R. (2009-03-19)
    We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope Advanced Camera for Surveys (HST/ACS). We analyse the field populations ...

  • Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal 

    Lewis, G. F.; Ibata, R. A.; Chapman, S. C.; McConnachie, A.; Irwin, M. J.; Tolstoy, E.; Tanvir, N. R. (2007-02-05)
    This paper presents a study of the Cetus dwarf, an isolated dwarf galaxy within the Local Group. A matched-filter analysis of the INT/WFC imaging of this system reveals no evidence for significant tidal debris that could ...

  • Kinematic and Chemical constraints on the formation of M31's inner and outer halo 

    Koch, A.; Rich, R. M.; Reitzel, D. B.; Martin, N. F.; Ibata, R. A.; Chapman, S. C.; Majewski, S. R.; Mori, M.; Loh, Y. -S; Ostheimer, J. C.; Tanaka, M. (2007-11-28)
    The halo of M31 shows a wealth of substructures that are consistent with satellite accretion. Here we report on kinematic and abundance results from Keck/DEIMOS spectroscopy in the calcium triplet region of over 3500 red ...

  • The kinematic identification of a thick stellar disc in M31 

    Collins, M. L. M.; Chapman, S. C.; Ibata, R. A.; Irwin, M. J.; Rich, R. M.; Ferguson, A. M. N.; Lewis, G. F.; Tanvir, N.; Koch, A. (2010-10-25)
    We present the first characterization of a thick disc component in the Andromeda galaxy (M31) using kinematic data from the DEIMOS multi-object spectrograph instrument on Keck II. Using 21 fields in the South West of the ...

  • The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation 

    Bellazzini, M.; Ibata, R. A.; Chapman, S. C.; Mackey, A. D.; Monaco, L.; Irwin, M. J.; Martin, N. F.; Lewis, G. F.; Dalessandro, E. (2008-09-01)
    We present the results of a thorough study of the nucleus of the Sgr dwarf spheroidal galaxy and of the bright globular cluster M54 that resides within the same nucleus (Sgr,N). We have obtained accurate radial velocities ...

  • The scatter about the "Universal" dwarf spheroidal mass profile: A kinematic study of the M31 satellites, And V and And VI 

    Collins, M. L. M.; Chapman, S. C.; Rich, R. M.; Ibata, R. A.; Irwin, M. J.; Peñarrubia, J.; Arimoto, N.; Brooks, A. M.; Ferguson, A. M. N.; Lewis, G. F.; McConnachie, A. W.; Venn, K. (2011-03-10)
    While the satellites of the Milky Way (MW) have been shown to be largely consistent in terms of their mass contained within one half--light radius (M_{half}) with a "Universal" mass profile, a number of M31 satellites are ...

  • Slicing The Monoceros Overdensity with Suprime-Cam 

    Conn, Blair C.; Noël, Noelia E. D.; Rix, Hans-Walter; Lane, R. R.; Lewis, G. F.; Irwin, M. J.; Martin, N. F.; Ibata, R. A.; Dolphin, A.; Chapman, S. (2012-05-14)
    We derive distance, density and metallicity distribution of the stellar Monoceros Overdensity (MO) in the outer Milky Way, based on deep imaging with the Subaru Telescope. We applied CMD fitting techniques in three stripes ...

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

    Conn, A. R.; Lewis, G. F.; Ibata, R. A.; Parker, Q. A.; Zucker, D. B.; McConnachie, A. W.; Martin, N. F.; Valls-Gabaud, D.; Tanvir, N.; Irwin, M. J.; Ferguson, A. M. N.; Chapman, S. C. (2013-04)
    No abstract available.