All articles tagged with #ursa major iii
Astronomers have determined that the faint satellite Ursa Major III orbiting the Milky Way is likely a star cluster held together by black holes rather than a dark-matter-dominated dwarf galaxy, resolving a major mystery about its composition.
Astronomers have reclassified the faint satellite Ursa Major III orbiting the Milky Way from a dark matter-dominated dwarf galaxy to a star cluster held together by a core of black holes and neutron stars, solving a major astrophysics mystery.
Astronomers have discovered a faint and tiny collection of stars, Ursa Major III / UNIONS 1 (UMa3/U1), orbiting the Milky Way, possibly dominated by dark matter and challenging our understanding of galaxy formation. The system, located 30,000 light-years away, consists of around 60 10-billion-year-old stars and may be either a dwarf galaxy or a star cluster. The stars are gravitationally bound together, and the team's analysis suggests that dark matter is responsible for holding them in their group. This discovery may have implications for the Lambda Cold Dark Matter (LCDM) model and could potentially redefine the concept of a 'galaxy.'
Astronomers have discovered Ursa Major III / UNIONS 1 (UMa3/U1), the faintest and lowest-mass Milky Way satellite ever detected, possibly dominated by dark matter. This ancient star system, located about 30,000 light-years from the sun, contains only about 60 stars over 10 billion years old and spans just 10 light-years across. The system was detected using data from the Ultraviolet Near Infrared Optical Northern Survey (UNIONS) and confirmed as a gravitationally-bound system using the Keck Observatory's Deep Imaging Multi-Object Spectrograph (DEIMOS). The presence or lack of dark matter in UMa3/U1 is crucial in determining whether it is a dwarf galaxy or a star cluster, potentially challenging our understanding of galaxy formation.