[yt-users] HOP threshold

[Agarwal, Shankar]

Hi, I am generating Halos using HOP (via yt). I see that the default overdensity is 160. I guess it means 160 particles per cell. But isn't cell size a function of the simulation box volume and the grid ?

For example, if Box=200Mpc and Ngrid=512^3, then cell=(0.390625 Mpc)^3
Isn't 0.390625 Mpc too big for a galaxy ?


What is the calculation behind 160 ?

shankar
KU Cosmology