In the interests of reproducibility and direct comparisons, we provide (or link to) the tools and parameters required for interested parties to reproduce the Eagle initial conditions.
| Item | Description |
| CAMB software | Used for generating the transfer function. |
| CAMB parameter file | Input parameters to CAMB for the Eagle/Planck cosmogony |
| Linear power spectrum | The input linear power spectrum for making the initial conditions produced by convolving the CAMB transfer function with the primordial power spectrum. |
| Glass file | Cubic glass-like distribution comprised of 47^3 equal-mass particles, used to generate particle loads. The gzipped tarball includes the particles distributed over 32 files, a README and an f77 program demonstrating how to read the particles. |
| Panphasia | The software used to generate the public realisation of a Gaussian white noise field called Panphasia. The linear phases for all the Eagle volumes are taken from small cubic subregions within the much larger Panphasia field. The precise locations of the phase information for each of the Eagle volumes, defined by a text phase descriptor, are reproduced below. |
| peano | Source code (in C) of a routine to compute the Peano-Hilbert indices (and hence ParticleIDs) of the particle distribution comprising the initial conditions. This enables efficient spatial indexing of the distribution for e.g. reading in subvolumes. |
Phase descriptors
The linear phases of the Eagle volumes are defined by the following
set of phase descriptors, that specify locations within the public
multi-scale Gaussian white noise field Panphasia.
| Boxsize (cMpc) | Descriptor |
6.25 |
[Panph1,L19,(40044,38524,52597),S3,CH2062909610,EAGLE_L0006_VOL1] |
12.5 |
[Panph1,L18,(34546,48586,31987),S3,CH1284484552,EAGLE_L0012_VOL1] |
25 |
[Panph1,L17,(22872,9140,6502),S3,CH1193192352,EAGLE_L0025_VOL1] |
50 |
[Panph1,L16,(9358,44124,48606),S3,CH1323953302,EAGLE_L0050_VOL1] |
100 |
[Panph1,L16,(31250,23438,39063),S12,CH1050187043,EAGLE_L0100_VOL1] |
200 |
[Panph1,L16,(27398,55228,10498),S3,CH664747129,EAGLE_L0200_VOL1] |
400 |
[Panph1,L16,(11324,24834,60541),S3,CH846509636,EAGLE_L0400_VOL1] |
800 |
[Panph1,L16,(65448,27937,42773),S3,CH773405482,EAGLE_L0800_VOL1] |
1600 |
[Panph1,L15,(18083,14638,23364),S3,CH1829653368,EAGLE_L1600_VOL1] |
3200 |
[Panph1,L14,(2152,5744,757),S3,CH1814785143,EAGLE_L3200_VOL1] |
6400 |
[Panph1,L13,(3868,2093,2715),S3,CH1320830929,EAGLE_L6400_VOL1] |