Author(s)

Bruce Hoeneisen

Universidad San Francisco de Quito, Quito, Ecuador.

We summarize several measurements of the dark matter temperature-to-mass ratio, or equivalently, of the comoving root-mean-square thermal velocity of warm dark matter particles $v_{h\text{rms}}\left(1\right)$ . The most reliable determination of this parameter comes from well measured rotation curves of dwarf galaxies by the LITTLE THINGS collaboration: $v_{h\text{rms}}\left(1\right)=406\pm 69\text{m}/\text{s}$ . Complementary and consistent measurements are obtained from rotation curves of spiral galaxies measured by the SPARC collaboration, density runs of giant elliptical galaxies, galaxy ultra-violet luminosity distributions, galaxy stellar mass distributions, first galaxies, and reionization. Having measured $v_{h\text{rms}}\left(1\right)$ , we then embark on a journey to the past that leads to a consistent set of measured dark matter properties, including mass, temperature and spin.

Warm Dark Matter, Dwarf Galaxies, Spiral Galaxies, Elliptical Galaxies, Galaxy Distributions, First Galaxies, Reionization

Hoeneisen, B. (2024) Measurements of the Dark Matter Mass, Temperature and Spin. International Journal of Astronomy and Astrophysics, 14, 184-202. doi: 10.4236/ijaa.2024.143012.