11 papers
Dwarf stellar haloes: a powerful probe of small-scale galaxy formation and the nature of dark matter
Alis J. Deason, Sownak Bose, Azadeh Fattahi +3
We use N-body cosmological simulations and empirical galaxy models to study the merger history of dwarf-mass galaxies (with M_halo~10^10 M_Sun). Our input galaxy models describe th…
Bar-halo interaction: the role of orbital anisotropy
Paula Gherghinescu, Francesca Fragkoudi, Alis Deason
We investigate the dynamical response of dispersion-dominated halo populations to a rotating galactic bar, focusing on how the underlying halo phase space distribution function (DF…
The velocity field of our Milky Way outer stellar halo based on DESI DR2
Songting Li, Wenting Wang, Sergey E. Koposov +53
Using 64,000 halo K giants from Dark Energy Spectroscopic Instrument (DESI) second Data Release (DR2), we decompose the Milky Way (MW) stellar halo between 3 and 160 kpc into metal…
A galactic tug-of-war: how (not) to simultaneously fit the Milky Way satellite luminosity function and the mass-metallicity relation
Sownak Bose, Alis J. Deason
The satellite population of the Milky Way is shaped by a range of astrophysical processes including mergers, star formation, feedback, and cosmic reionisation. Determining which pr…
The Milky Way stellar halo is twisted and doubly broken: insights from DESI DR2 Milky Way Survey observation
Songting Li, Wenting Wang, Sergey E. Koposov +45
Using K giants from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI) Milky Way (MW) Survey, we measure the shape, orientation, radial profile, and d…
Stellar streams around dwarf galaxies in the Local Universe
Joanna D. Sakowska, David MartÃnez-Delgado, Sarah Pearson +6
While mergers between massive galaxies and their dwarf satellites are well studied, the properties of dwarf - dwarf satellite mergers are not well constrained. Stellar streams trac…