What is the physical meaning of "inner" and "outer" fuzzes, the first defined as particles which are outside of any subhalo, and the latter particles which are outside any FoF halo? are they physical galaxies, SSP or unphysical objects? Thanks
Dylan Nelson
27 Jan '22
Do you mean for star particles? If so, "inner fuzz" i.e. extended halo particles would be called stellar halos or intra-cluster light (ICL). "Outer fuzz" would be very extended stellar halos.
Guan-Fu Liu
2 Apr
HI! I have a follow-up question: as for the gas particles, is it possible that some gas particles is within a halo physically but with positive energy such that are classified as outer fuzz?
Dylan Nelson
2 Apr
Yes, the difference between FoF halo particles and central subhalo particles is one of gravitational boundedness. There is no strict spatial definition. So bound particles can lie "outside" of a halo physically (i.e. beyond r200c, or any other radius you define), while unbound particles can lie "inside" such a radius.
Siddhant sen
16 Apr
Hi, the zoom-in snapshots contain two files per cluster ( high and low-resolution particles). In order to study the complete profile of a single cluster, does one need to load both the snapshots or just the high-resolution one (which belongs within the FoF halo)? Thanks in advance....
Dylan Nelson
17 Apr
Siddhant,
Your question specifically refers to the TNG-Cluster simulation. In this case, each snapshot of an original zoom (targeting one cluster) is made up of two files, as you say. To load the entire simulation of that cluster, you should load both files.
What is the physical meaning of "inner" and "outer" fuzzes, the first defined as particles which are outside of any subhalo, and the latter particles which are outside any FoF halo? are they physical galaxies, SSP or unphysical objects? Thanks
Do you mean for star particles? If so, "inner fuzz" i.e. extended halo particles would be called stellar halos or intra-cluster light (ICL). "Outer fuzz" would be very extended stellar halos.
HI! I have a follow-up question: as for the gas particles, is it possible that some gas particles is within a halo physically but with positive energy such that are classified as outer fuzz?
Yes, the difference between FoF halo particles and central subhalo particles is one of gravitational boundedness. There is no strict spatial definition. So bound particles can lie "outside" of a halo physically (i.e. beyond r200c, or any other radius you define), while unbound particles can lie "inside" such a radius.
Hi, the zoom-in snapshots contain two files per cluster ( high and low-resolution particles). In order to study the complete profile of a single cluster, does one need to load both the snapshots or just the high-resolution one (which belongs within the FoF halo)? Thanks in advance....
Siddhant,
Your question specifically refers to the TNG-Cluster simulation. In this case, each snapshot of an original zoom (targeting one cluster) is made up of two files, as you say. To load the entire simulation of that cluster, you should load both files.