57 citations · 290 across the 18 of their papers we have counts for
5 papers · 1 filter
MOSAIC: the high-multiplex and multi-IFU spectrograph for the ELT
Rubén Sánchez-Janssen, Francois Hammer, Simon Morris +40
MOSAIC is the planned multi-object spectrograph for the 39m Extremely Large Telescope (ELT). Conceived as a multi-purpose instrument, it offers both high multiplex and multi-IFU ca…
Two substructures in the nearby stellar halo found in Gaia and RAVE
Hefan Li, Cuihua Du, Yanbin Yang +4
We use the second Gaia data release (Gaia DR2), combined with RAVE spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3,845 halo stars kinem…
Most dwarf spheroidal galaxies surrounding the Milky Way cannot be dark-matter dominated satellites
Francois Hammer, Yanbin Yang, Frederic Arenou +5
Milky Way dwarf spheroidal galaxies are the tiniest observed galaxies and are currently associated with the largest fractions of dark matter, which is revealed by their too large v…
A Recent Major Merger Tale for the Closest Giant Elliptical Galaxy Centaurus A
Jianling Wang, Francois Hammer, Marina Rejkuba +2
We have used hydrodynamical simulations to model the formation of the closest giant elliptical galaxy, Centaurus A. We find that a single major merger event with a mass ratio up to…
Orbital evidences for dark-matter-free Milky Way dwarf spheroidal galaxies
Francois Hammer, Yanbin Yang, Frederic Arenou +4
The nature of Milky Way dwarf spheroidals (MW dSphs) has been questioned, in particular whether they are dominated by dark matter (DM). Here we investigate an alternative scenario,…