Dark matter dominated dwarf spheroidal galaxies are some of the best places to test predictions on how dark matter behaves in the Universe. Predictions for how the dark matter should be distributed in these galaxies disagrees with what is actually observed, however. The authors of today’s Astrobite investigate how the dark matter profiles may evolve over time from what is predicted to what we see today.
Dark matter permeates the Universe and surrounds every galaxies in the form of dark matter halos. We don’t really know dark matter works, as predictions of standard cosmology, Lambda Cold Dark Matter (ΛCDM), are way off from observations. Is this the death of Cold Dark Matter, or there are something more to it?
Dark matter, in the form of primordial black holes, can potentially trigger Type Ia supernovae in white dwarfs.
Stars formed in the early Universe were extremely massive and extremely low in elements heavier than helium. The transition from the first to the second generation of stars is still hidden in the shadows of the past. However, simulations of the most massive supernovae can help us to decipher the way of how the life cycle of stars came into being.
If dark matter particles can collide to release gamma-rays, the best place to see them will be in the centers of dwarf galaxies. Archival Fermi-LAT images around Reticulum 2 show the first ever detection of gamma-rays from a dwarf galaxy. Dark matter detection may be close at hand!
How do you get a glimpse of dark matter? Stare really hard at the outskirts of galaxies and hope the matter isn’t totally dark.