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Dark matter halo cores and the tidal survival of Milky Way satellites
Raphaël Errani, Julio F. Navarro, Jorge Peñarrubia +2
The cuspy central density profiles of cold dark matter (CDM) haloes make them highly resilient to disruption by tides. Self-interactions between dark matter particles, or the cycli…
Discovery of a new Local Group Dwarf Galaxy Candidate in UNIONS: Boötes V
Simon E. T. Smith, Jaclyn Jensen, Joel Roediger +12
We present the discovery of Boötes V, a new ultra-faint dwarf galaxy candidate. This satellite is detected as a resolved overdensity of stars during an ongoing search for new Local…
The Cosmic Hunt for Members in the Outskirts of Ultra Faint Dwarf Galaxies: Ursa Major I, Coma Berenices, and Boötes I
Fletcher Waller, Kim Venn, Federico Sestito +6
Gaia EDR3 data was used to identify potential members in the outskirts of three ultra faint dwarf (UFD) galaxies; Coma Berenices (> 2Rh), Ursa Major I ( 4Rh), and Boötes I ($…
The Tucana dwarf spheroidal: a distant backsplash galaxy of M31?
Isabel M. E. Santos-Santos, Julio F. Navarro, Alan McConnachie
We use the APOSTLE Local Group (LG) cosmological hydro-simulations to examine the properties of "backsplash" galaxies, i.e, dwarfs which were within the virial boundaries of the Mi…
Velocity-dependent J-factors for Milky Way dwarf spheroidal analogues in cosmological simulations
Keagan Blanchette, Erin Piccirillo, Nassim Bozorgnia +5
We study the impact of the dark matter velocity distribution modelling on signals from velocity-dependent dark matter annihilation in Milky Way dwarf spheroidal galaxies. Using the…
The cosmic UV background and the beginning and end of star formation in simulated field dwarf galaxies
Matthew Pereira-Wilson, Julio Navarro, Alejandro Benítez-Llambay +1
We use the APOSTLE cosmological simulations to examine the role of the cosmic UV background in regulating star formation (SF) in low-mass LCDM halos. In agreement with earlier work…
The diversity of rotation curves of simulated galaxies with cusps and cores
Finn A. Roper, Kyle A. Oman, Carlos S. Frenk +3
We use CDM cosmological hydrodynamical simulations to explore the kinematics of gaseous discs in late-type dwarf galaxies. We create high-resolution 21-cm 'observations' of simu…
The Pristine survey XVIII: C-19: Tidal debris of a dark matter-dominated globular cluster?
Raphaël Errani, Julio F. Navarro, Rodrigo Ibata +12
The recently discovered C-19 stellar stream is a collection of kinematically associated metal-poor stars in the halo of the Milky Way lacking an obvious progenitor. The stream span…
The Pristine survey -- XVII. The C-19 stream is dynamically hot and more extended than previously thought
Zhen Yuan, Nicolas F. Martin, Rodrigo A. Ibata +22
The C-19 stream is the most metal poor stellar system ever discovered, with a mean metallicity . Its low metallicity dispersion ( 0.18 at…
A stellar stream remnant of a globular cluster below the metallicity floor
Nicolas F. Martin, Kim A. Venn, David S. Aguado +23
Stellar ejecta gradually enrich the gas out of which subsequent stars form, making the least chemically enriched stellar systems direct fossils of structures formed in the early un…
The Pristine survey -- XVI. The metallicity of 26 stellar streams around the Milky Way detected with the STREAMFINDER in Gaia EDR3
Nicolas F. Martin, Rodrigo A. Ibata, Else Starkenburg +21
We use the photometric metallicities provided by the panoramic Pristine survey to study the veracity and derive the metallicities of the numerous stellar streams found by the appli…