Browsing Faculty of Science by Author "Tanvir, Nial"
Now showing items 1-9 of 9
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A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part II); Distances to the Satellites of M31
Conn, Anthony R.; Ibata, Rodrigo A.; Lewis, Geraint F.; Parker, Quentin A.; Zucker, Daniel B.; Martin, Nicolas F.; McConnachie, Alan W.; Irwin, Mike J.; Tanvir, Nial; Fardal, Mark A.; Ferguson, Annette M. N.; Chapman, Scott C.; Valls-Gabaud, David (2012-09-21)In `A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (PART I),' a new technique was introduced for obtaining distances using the TRGB standard candle. Here we describe a useful complement to the technique ... -
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 ... -
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 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 ... -
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 ...