Baryons and halos Flashcards
1
Q
collapsed halo density =
A
rho_coll=18pi^2 omega_m (1+z_coll)^3 3*H_0/(8 pi G)
or! 5.58rho_turnaround
2
Q
if t_c >t_H
A
The halo has no time to cool
3
Q
t_ff< t_c < T_H
A
Quasi-static, has time to readjust as it cools
4
Q
t_c< t_ff < t_H
A
cooling is faster than dynamics can follow. Needed to form stars/galaxies. Fragments on Jeans mass scale
