6 papers
Tidal origin of dark-matter free dwarf galaxies in the NGC 1052 group
Francois Hammer, Yanbin Yang
The discovery of dark matter-free (DM-free) dwarf galaxies in the NGC 1052 neighborhood has had a considerable impact on modern cosmology. The galaxies have been explained through…
The accretion history of the Milky Way V. The kinematics of most globular clusters trace the merger epochs
Istiak Akib, François Hammer, Yanbin Yang
Several studies have associated globular clusters (GCs) with former Galactic accretion events by comparing their positions in the energy-angular momentum (-) plane, an appr…
Reconstructing the whole 6D properties of the Sagittarius stream with N-body simulations
Hai-Feng Wang, Yan-Bin Yang, Francois Hammer +1
It is a challenge to reproduce the full 6D space-phase properties of Sagittarius (Sgr) dwarf galaxy and its Stream simultaneously. Using N-body simulations with a Milky Way mass of…
Young stars discovered in dwarf spheroidal galaxies confirm their recent infall into the Milky way
Francois Hammer, Piercarlo Bonifacio, Elisabetta Caffau +10
Recent observations from the ESA Gaia satellite and with the ESO VLT, have identified the presence of a population of young, 0.5 to 2 Gyr old, stars in the halo and in dwarf sphero…
Impact of merger histories on the timing argument estimate of the Local Group mass
Istiak Akib, François Hammer, Yanbin Yang
The timing argument (TA) aims to find the total mass of the Local Group (LG) from the relative motions of the Milky Way (MW) and Andromeda Galaxy (M31). However, the classical TA a…
An intriguing coincidence between the majority of vast polar structure dwarfs and a recent major merger at the M31 position
Istiak Akib, François Hammer, Yanbin Yang +2
A significant part of the Milky Way (MW) dwarf galaxies orbit within a Vast POlar Structure (VPOS), which is perpendicular to the Galactic disc and whose origin has not yet been id…