I search a particular Subhalo at a particular snapshot; I make the tree of this Subhalo. I understand the linear tree, but I don't know how to interpret the 3D Tree:

-colors: indicates the velocity? which velocity? peculiar velocity, dispersion velocity or ...?

-dimension of the spheres: is it related to the solar mass of the subhalo, like for the linear tree?

-positions in the volume of the simulation : is it an overlapping of the position of every progenitor subhalo at every z?

Thanks for helping me,
Flaminia

Dylan Nelson

13 May '18

Hi Flaminia,

This is mainly meant as a qualitative tool - for any analysis, I would make sure to look at the actual values of the tree data. To answer your questions:

You're right, color encodes velocity - the 3D velocity magnitude of the motion of the halo, over a range of ~150 to ~250 km/s (beyond this the color saturates).

The sphere radius scales with the total halo mass (logarithmic).

Yes the positions give the actual, 3D positions of all the progenitor subhalos at all redshifts.

Flaminia Fortuni

14 May '18

yes, i need it just for a qualitative comparison. Thanks for your help

I search a particular Subhalo at a particular snapshot; I make the tree of this Subhalo. I understand the linear tree, but I don't know how to interpret the 3D Tree:

-colors: indicates the velocity? which velocity? peculiar velocity, dispersion velocity or ...?

-dimension of the spheres: is it related to the solar mass of the subhalo, like for the linear tree?

-positions in the volume of the simulation : is it an overlapping of the position of every progenitor subhalo at every z?

Thanks for helping me, Flaminia

Hi Flaminia,

This is mainly meant as a qualitative tool - for any analysis, I would make sure to look at the actual values of the tree data. To answer your questions:

yes, i need it just for a qualitative comparison. Thanks for your help