Browsing by Author "Ferguson, A. M. N."

Now showing items 1-17 of 17

  • 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 ...

  • Density Variations in the NW Star Stream of M31 

    Carlberg, R. G.; Richer, Harvey B.; McConnachie, Alan W.; Irwin, Mike; Ibata, Rodrigo A.; Dotter, Aaron L.; Chapman, Scott; Fardal, Mark; Ferguson, A. M. N.; Lewis, G. F.; Navarro, Julio F.; Puzia, Thomas H.; Valls-Gabaud, David (2011-02-17)
    The Pan Andromeda Archeological Survey (PAndAS) CFHT Megaprime survey of the M31-M33 system has found a star stream which extends about 120 kpc NW from the center of M31. The great length of the stream, and the likelihood ...

  • 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 ...

  • The Discovery of Remote Globular Clusters in M33 

    Huxor, A.; Ferguson, A. M. N.; Barker, M. K.; Tanvir, N. R.; Irwin, M. J.; Chapman, S. C.; Ibata, R.; Lewis, G. (2009-06-20)
    We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton Telescope Wide-Field Camera while one was ...

  • 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 ...

  • The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action 

    Ibata, R.; Martin, N. F.; Irwin, M.; Chapman, S.; Ferguson, A. M. N.; Lewis, G. F.; McConnachie, A. W. (2007-12-20)
    We present a deep photometric survey of M31, conducted with the CFHT and INT, covering the inner 50 kpc of the galaxy, the Southern quadrant out to 150 kpc, and extending to M33. This is the first systematic panoramic study ...

  • 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 ...

  • The kinematic footprints of five stellar streams in Andromeda's halo 

    Chapman, S. C.; Ibata, R.; Irwin, M.; Koch, A.; Letarte, B.; Martin, N.; Collins, M.; Lewis, G. F.; McConnachie, A.; Penarrubia, J.; Rich, R. M.; Trethewey, D.; Ferguson, A. M. N.; Huxor, A.; Tanvir, N. (2008-10)
    (abridged) We present a spectroscopic analysis of five stellar streams (`A', `B', `Cr', `Cp' and `D') as well as the extended star cluster, EC4, which lies within streamC, all discovered in the halo of M31 from our ...

  • 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 ...

  • A kinematically selected, metal-poor stellar halo in the outskirts of M31 

    Chapman, S. C.; Ibata, R.; Lewis, G. F.; Ferguson, A. M. N.; Irwin, M.; McConnachie, A.; Tanvir, N. (2006-12-10)
    We present evidence for a metal-poor, [Fe/H]$\sim-1.4$ $\sigma$=0.2 dex, stellar halo component detectable at radii from 10 kpc to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample ...

  • On the accretion origin of a vast extended stellar disk around the Andromeda galaxy 

    Ibata, R.; Chapman, S.; Ferguson, A. M. N.; Lewis, G.; Irwin, M.; Tanvir, N. (2005-11-20)
    We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS spectrograph. ...

  • 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 ...

  • A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo 

    Collins, M. L. M.; Chapman, S. C.; Irwin, M.; Ibata, R.; Martin, N. F.; Ferguson, A. M. N.; Huxor, A.; Lewis, G. F.; Mackey, A. D.; McConnachie, A. W.; Tanvir, N. (2009-03-26)
    We present a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the tidal streams, Stream Cp and Stream Cr. ...

  • The structure of star clusters in the outer halo of M31 

    Tanvir, N. R.; Mackey, A. D.; Ferguson, A. M. N.; Huxor, A. P.; Read, J. I.; Lewis, G. F.; Irwin, M. J.; Chapman, S.; Ibata, R.; Wilkinson, M. I.; McConnachie, A. W.; Martin, N. F.; Davies, M. B.; Bridges, T. J. (2012-02-09)
    We present a structural analysis of halo star clusters in M31 based on deep Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. The clusters in our sample span a range in galactocentric projected distance ...

  • Taking measure of the Andromeda halo: a kinematic analysis of the giant stream surrounding M31 

    Ibata, R.; Chapman, S.; Ferguson, A. M. N.; Irwin, M.; Lewis, G.; McConnachie, A. (2004-06)
    We present a spectroscopic survey of the giant stellar stream found in the halo of the Andromeda galaxy. Taken with the DEIMOS multi-object spectrograph on the Keck2 telescope, these data display a narrow velocity dispersion ...

  • 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.