TITLE:
Measurements of the Dark Matter Mass, Temperature and Spin
AUTHORS:
Bruce Hoeneisen
KEYWORDS:
Warm Dark Matter, Dwarf Galaxies, Spiral Galaxies, Elliptical Galaxies, Galaxy Distributions, First Galaxies, Reionization
JOURNAL NAME:
International Journal of Astronomy and Astrophysics,
Vol.14 No.3,
August
27,
2024
ABSTRACT: 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
hrms
(
1
)
. The most reliable determination of this parameter comes from well measured rotation curves of dwarf galaxies by the LITTLE THINGS collaboration:
v
hrms
(
1
)=406±69 m/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
hrms
(
1
)
, 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.