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eaglesnap - convert EAGLE hdf5 snapshots to NEMO snapshot format
eaglesnap converts an HDF5 snapshot from the
EAGLE simulation in a NEMO snapshot format. Various selections are possible:
an X,Y,Z region, particle type (enforced), group and subgroup.
only mass and phasespace coordinates are converted. This is still done in
code units, in a future option conversion to astrophysical units will be
debug=1 will also list the datasets contents of the HDF5 file.
The following parameters are recognized in any order if the keyword
is also given:
Assuming you have a username/password for database
access, the following commands show some of the things you can do
- Input file (HDF5). Only one of the HDF5 parts
needs to be given. The eagle_read access routines know how to find all of
them. No default.
- Output file, in snapshot format. No default.
- Which particle type 0-5 (0=gas, 1=DM, 4=star, 5=BH) 
rectangular region (xmin,xmax,ymin,ymax,zmin,zmax). If two values are given,
they are xmin,xmax and replicated as a cube for Y and Z. If one value is
given, this is xmax, and 0,xmax is selected and again replicated for Y
and Z. [0,10,0,10,0,10]
- Select this group (-1 means all,1..NG are validm
2^30 is no group)) [-1]
- Select this subgroup (-1 means all, 0..NSG-1
are valid, 2^30 is no subgroup) [-1]
- Convert to Mpc, Msol, .... - not implemented
- If given, it will center the selected particles here (3 values,
in code units), meaning the coordinated will be shifted such that the center
will be (0,0,0). You will also need to specify a boxsize, since the grid
is periodic. [Default: not used]
- Size of the box if center= is
used. This value is also inside the HDF file, but not available via read_eagle.
Default: not used, required if center= is given.
- A cheat by which the
total dark matter (DM) mass can be set. Once eagle_read() can grab those
from the header, this keyword will not be needed anymore and likely disappear.
Current default: 1
wget --user=... --ask-password --content-disposition
tar xvf RefL0012N0188_snap_028.tar
h5dump -n RefL0012N0188/snapshot_028_z000p000/snap_028_z000p000.0.hdf5
snap1 ptype=0 region=2
Data are taken from a typical co-moving cosmological grid. Objects near the
edge, may seem to wind up in two places, as can be seen in the following
snap2 0 group=2
snapplot3 snap2 xrange=-10:10 yrange=-10:10 zrange=-10:10
http://dataweb.cosma.dur.ac.uk:8080/eagle-snapshots/ - EAGLE snapshots
http://icc.dur.ac.uk/Eagle/index.php - The EAGLE Project
http://icc.dur.ac.uk/Eagle/database.php - EAGLE database access
https://github.com/jchelly/read_eagle - library used
https://kyleaoman.github.io/martini - MARTINI
NEMO/usr/eagle directory with support to install EAGLE tools
NEMO/src/nbody/io/eaglesnap.c code for eaglesnap
This will be the section for eagle(5NEMO)
, but now it’s here
is the small volume (12Mpc) reference run. It has 29 slices in z, ranging
from slice 0 at z=20 to slice 28 at z=0.0. Slice 27, the one but most recent
slice, is at z=0.10. The number of particles is (188^3) 6,644,672 per species
(gas and DM). At z=0 one can see 6,381,559 gas, 262380 stars, and 547 BH,
this still 186 short, so did some merge? This means SFE = 4.0% Each snapshot
comes in "nfiles" parts, e.g. snap_028_z000p000.0.hdf5, snap_028_z000p000.1.hdf5,
... snap_028_z000p000.15.hdf5. The read_eagle routines will automatically read
of all these in order to populate the snapshot correctly.
L=12, 25, 50, 100 co-moving Mpc are available.
02-Nov-19 V0.1 Created PJT
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