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37 lines
1.9 KiB
Text
37 lines
1.9 KiB
Text
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Various column names
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Clump file columns:
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"index", "lev", "parent", "ncell", "peak_x", "peak_y", "peak_z", "rho-", "rho+", "rho_av", "mass_cl", "relevance"
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Mergertree file columns:
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"clump", "progenitor", "prog outputnr", "desc mass", "desc npart", "desc x", "desc y", "desc z", "desc vx", "desc vy", "desc vz"
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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The merger trees are stored in `output_XXXXX/mergertree_XXXXX.txtYYYYY` files. Each file contains 11 columns:
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* `clump`: clump ID of a clump at this output number
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* `progenitor`: the progenitor clump ID in output number "prog_outputnr"
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* `prog_outputnr`: the output number of when the progenitor was an alive clump
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* `desc mass`: mass of the current clump.
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* `desc npart`: number of particles of the current clump.
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* `desc x,y,z`: x, y, z position of current clump.
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* `desc vx, vy, vz`: x, y, z velocities of current clump.
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desc_mass and desc_npart will be either inclusive or exclusive, depending on how you set the `use_exclusive_mass` parameter.
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(See below for details)
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**How to read the output:**
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* A clump > 0 has progenitor > 0: Standard case. A direct progenitor from the adjacent previous snapshot was identified for this clump.
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* A clump > 0 has progenitor = 0: no progenitor could be established and the clump is treated as newly formed.
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* A clump > 0 has progenitor < 0: it means that no direct progenitor could be found in the adjacent previous snapshot, but a progenitor was identified from an earlier, non-adjacent snapshot.
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* A clump < 0 has progenitor > 0: this progenitor merged into this clump, but is not this clump's main progenitor.
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* A clump < 0 has progenitor < 0: this shouldn't happen.
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### Visualisation
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`ramses/utils/py/mergertreeplot.py` is a python 2 script to plot the merger trees as found by this patch.
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Details on options and usage are at the start of the script as a comment.
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