Ultra-diffuse galaxies without dark matter. (arXiv:1905.13235v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Silk_J/0/1/0/all/0/1">Joseph Silk</a>
I develop a high velocity galaxy collision model to explain a rare but
puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies
with little dark matter. Predictions include simultaneous triggering of
overpressured dense clouds to form luminous old globular clusters, a protogroup
environment to generate high relative velocities of the initially gas-rich
galaxies in the early universe, and spatially separated dark halos, possibly
detectable via gravitational lensing and containing relic low metallicity stars
with enhanced [alpha/Fe] at ultralow surface brightness.
I develop a high velocity galaxy collision model to explain a rare but
puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies
with little dark matter. Predictions include simultaneous triggering of
overpressured dense clouds to form luminous old globular clusters, a protogroup
environment to generate high relative velocities of the initially gas-rich
galaxies in the early universe, and spatially separated dark halos, possibly
detectable via gravitational lensing and containing relic low metallicity stars
with enhanced [alpha/Fe] at ultralow surface brightness.
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