get halo's particle sample when only partial snapshot data are available?

Sihan Yuan
  • 10 Aug '21


I am trying to get the particle sets of all halos within a specific chunk. This came about because I want to run a test on a set of halos and their particles, but I do not want to download the whole snapshot. So how do I go about selecting only halos that correspond to a specific chunk, and then getting their particles?


Dylan Nelson
  • 10 Aug '21

Note that you can download particle cutouts (see e.g. Task 4) for a specific halo, which might be easiest.

Otherwise, if you have downloaded a chunk, you can check the offsets. If the offset for a halo starts within the chunk, and offset+length finishes within the chunk, then you can find all its particles (of a given type) there.

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