The correlation structure of dark matter halo properties

Jeeson-Daniel, Akila; Dalla Vecchia, C.; Haas, Marcel R.; Schaye, Joop
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society: Letters, Volume 415, Issue 1, pp. L69-L73.

Fecha de publicación:
7
2011
Número de autores
4
Número de autores del IAC
0
Número de citas
45
Número de citas referidas
43
Descripción
We investigate the correlation between nine different dark matter halo properties using a rank correlation analysis and a Principal Component Analysis for a sample of haloes spanning five orders of magnitude in mass. We consider mass and dimensionless measures of concentration, age, relaxedness, sphericity, triaxiality, substructure, spin and environment, where the latter is defined in a way that makes it insensitive to mass. We find that concentration is the most fundamental property. Except for environment, all parameters are strongly correlated with concentration. Concentration, age, substructure, mass, sphericity and relaxedness can be considered a single family of parameters, albeit with substantial scatter. In contrast, spin, environment and triaxiality are more independent, although spin does correlate strongly with substructure and both spin and triaxiality correlate substantially with concentration. Although mass sets the scale of a halo, all other properties are more sensitive to concentration.