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A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And IX, And XI, And XII, and And XIII
M. L. M. Collins, S. C. Chapman, M. J. Irwin +8
We present the first spectroscopic analysis of the faint M31 satellite galaxies, AndXI and AndXIII, and a reanalysis of existing spectroscopic data for two further faint companions…
PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies
Nicolas F. Martin, Alan W. McConnachie, Mike Irwin +10
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 disc…
Resolving the Stellar Outskirts of M81: Evidence for a Faint, Extended Structural Component
M. K. Barker, A. M. N. Ferguson, M. Irwin +2
We present a wide field census of resolved stellar populations in the northern half of M81, conducted with Suprime-Cam on the 8-m Subaru telescope and covering an area ~ 0.3 square…
The remnants of galaxy formation from a panoramic survey of the region around M31
Alan W. McConnachie, Michael J. Irwin, Rodrigo A. Ibata +26
In hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely b…