question when using subhalo catalog(subhaloparent)
Taehwa Yoo
17 Nov '17
Hi, i have a question when I use subhalo catalog.
it is about subhaloparent, what does it exactly mean? it saids that it is subhalo table of unique SUBF host/parent of subhalo and I don't know what SUBF stands for.
Actually, I'm trying to elliminate satellite galaxies in my research. First, i assumed subhaloparents means primary/secondary/third/... massive subhalo in group so I selected central galaxy by choosing subhalo whose subhaloparents=0.
Alternatively, I also chose subhalo whose Groupfirstsub is not -1 because Groupfirstsub means primary subhaloes in group.
The first and second method results different number of subhaloes that means subhaloparents doesn 't mean what I thought.
"SUBF" means "subhalo" or "subfind subhalo", same thing.
If you load the GroupFirstSub field for all groups (note: not subhalos!), this is a list of subhalo IDs/indices. This list is exactly the central subhalos, and all subhalos not in this list are by definition satellites. I would do this.
Hi, i have a question when I use subhalo catalog. it is about subhaloparent, what does it exactly mean? it saids that it is subhalo table of unique SUBF host/parent of subhalo and I don't know what SUBF stands for.
Actually, I'm trying to elliminate satellite galaxies in my research. First, i assumed subhaloparents means primary/secondary/third/... massive subhalo in group so I selected central galaxy by choosing subhalo whose subhaloparents=0. Alternatively, I also chose subhalo whose Groupfirstsub is not -1 because Groupfirstsub means primary subhaloes in group. The first and second method results different number of subhaloes that means subhaloparents doesn 't mean what I thought.
Hi Taehwa,
"SUBF" means "subhalo" or "subfind subhalo", same thing.
If you load the
GroupFirstSubfield for all groups (note: not subhalos!), this is a list of subhalo IDs/indices. This list is exactly the central subhalos, and all subhalos not in this list are by definition satellites. I would do this.