[yt-users] rockstar question

Sam Skillman samskillman at gmail.com
Thu Apr 7 21:17:19 PDT 2016


At some point I may have known more, but I'm afraid I'm of little help on
that at this point. The only bit I remember at the moment is building a
tree that allows you to search for child halos within each potential parent
halo quickly.

Sam

On Thu, Apr 7, 2016 at 12:19 PM Matthew Turk <matthewturk at gmail.com> wrote:

> Hi Bobby,
>
> For #1, I'm not sure.  Sam Skillman may now more.
>
> For #2, I believe that is correct, but I am unable to verify it right
> now.  And the reason I'm *not* 100% sure is because the order you pass
> them in will be by FOF node, but then within a FOF node you won't
> necessarily have sequential particles belonging to the same subgroups.
>
> On Thu, Mar 31, 2016 at 12:20 PM, Robert Thompson <rthompsonj at gmail.com>
> wrote:
> > Hi yt users!  I had two quick questions regarding yt’s Rockstar
> implementation.  Within the data returned from the return_halos() method:
> >
> > 1) how would one determine parent/child relationship?
> > 2) how would one determine which particles belong to which halo?  The
> returned data has “num_p" and “p_start” variables, but I’m not sure if
> those indexes line up with the ordering in which I passed the particles in
> to the make_rockstar_fof() function.
> >
> > Thanks!
> >
> > -Robert Thompson
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