Browsing by Author "Irwin, Mike"

Now showing items 1-6 of 6

  • 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 ...

  • Evidence for an accretion origin for the outer halo globular cluster system of M31 

    Mackey, Dougal; Huxor, Avon; Ferguson, Annette; Irwin, Mike; Tanvir, Nial; McConnachie, Alan; Ibata, Rodrigo; Chapman, Scott; Lewis, Geraint (2010-05-20)
    We use a sample of newly-discovered globular clusters from the Pan-Andromeda Archaeological Survey (PAndAS) in combination with previously-catalogued objects to map the spatial distribution of globular clusters in the M31 ...

  • A Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scales 

    Chapman, Scott C.; Ibata, Rodrigo; Lewis, Geraint F.; Ferguson, Annette M. N.; Irwin, Mike; McConnachie, Alan; Tanvir, Nial (2005-10-20)
    We present the results of a kinematic survey of the dwarf spheroidal satellite of M31, And-IX, which appears to be the lowest surface brightness and also the faintest galaxy (M_V = -8.3) found to date. Using Keck/DEIMOS ...

  • PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies 

    Martin, Nicolas F.; McConnachie, Alan W.; Irwin, Mike; Widrow, Lawrence M.; Ferguson, Annette M. N.; Ibata, Rodrigo A.; Dubinski, John; Babul, Arif; Chapman, Scott; Fardal, Mark; Lewis, Geraint F.; Navarro, Julio; Rich, R. Michael (2009-09-02)
    We present the discovery of two new dwarf galaxies, Andromeda XXI and Andromeda XXII, located in the surroundings of the Andromeda and Triangulum galaxies (M31 and M33). These discoveries stem from the first year data of ...

  • PAndAS' progeny: extending the M31 dwarf galaxy cabal 

    Richardson, Jenny C.; Irwin, Mike; McConnachie, Alan W.; Martin, Nicolas F.; Dotter, Aaron; Ferguson, Annette M. N.; Ibata, Rodrigo A.; Chapman, Scott; Lewis, Geraint F.; Tanvir, Nial R.; Rich, R. Michael (2011-02-14)
    We present the discovery of five new dwarf galaxies, Andromeda XXIII-XXVII, located in the outer halo of M31. These galaxies were found in the second year of data from the Pan-Andromeda Archaeological Survey (PAndAS) of ...

  • A trio of new Local Group galaxies with extreme properties 

    McConnachie, Alan; Huxor, Avon; Martin, Nicolas; Irwin, Mike; Chapman, Scott; Fahlman, Gregory; Ferguson, Annette; Ibata, Rodrigo; Lewis, Geraint; Richer, Harvey; Tanvir, Nial (2008-12)
    We report on the discovery of three new dwarf galaxies in the Local Group. These galaxies are found in new CFHT/MegaPrime g,i imaging of the south-western quadrant of M31, extending our extant survey area to include the ...