General description
The simulations in the DREAMS project are designed to 1) unveil the nature of dark matter and 2) improve our knowledge on the physics shaping the Universe on small scales.
Organization
DREAMS contains thousands of N-body and hydrodynamic simulations. The simulations can be organized into:
Models, depending on the dark matter model adopted:
Cold dark matter
Warm dark matter
h-peak k-peak
ETHOS
Atomic dark matter
Types, depending on the environment simulated:
Cosmological boxes
Milky-way zooms-ins
Dwarfs zoom-ins
Suites, depending on the code used to run them:
IllustrisTNG
Ramses
N-body
The scheme below illustrates the DREAMS data structure. The ellipses represent the different models, and the relation among them. For instance, CDM, WDM, and h-peak k-peak models are a subset of ETHOS. Inside each ellipse, we show the available types. For instance, the CDM model contains cosmological boxes, Milky way zoom-ins, and dwarfs zoom-ins. The color of the types indicates the suite: purple (run with IllustrisTNG), yellow (run with Ramses).
Characteristics
This table shows the characteristics of the DREAMS simulations:
Model |
Type |
Suite |
Cosmology |
Simulations |
Status |
|---|---|---|---|---|---|
Cold dark matter (CDM) |
Boxes |
IllustrisTNG |
Varied |
1024 |
Complete |
Milky Way |
IllustrisTNG |
Varied |
1024 |
Running |
|
Dwarfs |
Ramses |
Varied |
1024 |
Planned |
|
Warm dark matter (WDM) |
Boxes |
N-body |
Fixed |
600 |
Complete |
Boxes |
N-body |
Varied |
1000 |
Complete |
|
Boxes |
IllustrisTNG |
Varied |
1024 |
Complete |
|
Milky Way |
IllustrisTNG |
Fixed |
1024 |
Complete |
|
Hpeak Kpeak |
Boxes |
N-body |
Fixed |
400 |
Complete |
Boxes |
N-body |
Varied |
1024 |
Planned |
|
Boxes |
IllustrisTNG |
Varied |
1024 |
Planned |
|
Dwarfs |
Ramses |
Varied |
1024 |
Planned |
|
ETHOS |
Milky way |
N-body |
Varied |
1024 |
Planned |
Milky Way |
IllustrisTNG |
Varied |
1024 |
Planned |
|
Atomic dark matter (ADM) |
Milky way |
N-body |
Varied |
1024 |
Planned |
Milky Way |
IllustrisTNG |
Varied |
1024 |
Planned |
Redshifts
All simulations contain 91 snapshots. This file contains the scale factors of the snapshots. The user can click below to see the redshift, scale factor, and snapshot number for the different snapshots:
Click here to see the relation between the snapshot number and the redshift
Redshift |
Scale Factor |
snapshot number |
|---|---|---|
14.99 |
0.063 |
000 |
13.34 |
0.070 |
001 |
11.98 |
0.077 |
002 |
11.20 |
0.082 |
003 |
10.48 |
0.087 |
004 |
9.69 |
0.094 |
005 |
9.00 |
0.100 |
006 |
8.49 |
0.105 |
007 |
8.01 |
0.111 |
008 |
7.60 |
0.116 |
009 |
7.24 |
0.121 |
010 |
6.89 |
0.127 |
011 |
6.56 |
0.132 |
012 |
6.28 |
0.137 |
013 |
6.01 |
0.143 |
014 |
5.75 |
0.148 |
015 |
5.50 |
0.154 |
016 |
5.23 |
0.161 |
017 |
5.00 |
0.167 |
018 |
4.80 |
0.172 |
019 |
4.61 |
0.178 |
020 |
4.45 |
0.183 |
021 |
4.30 |
0.189 |
022 |
4.15 |
0.194 |
023 |
4.01 |
0.200 |
024 |
3.87 |
0.205 |
025 |
3.73 |
0.211 |
026 |
3.62 |
0.216 |
027 |
3.49 |
0.223 |
028 |
3.36 |
0.229 |
029 |
3.24 |
0.236 |
030 |
3.12 |
0.242 |
031 |
3.01 |
0.249 |
032 |
2.90 |
0.257 |
033 |
2.80 |
0.263 |
034 |
2.72 |
0.269 |
035 |
2.63 |
0.276 |
036 |
2.54 |
0.282 |
037 |
2.46 |
0.289 |
038 |
2.38 |
0.296 |
039 |
2.30 |
0.303 |
040 |
2.22 |
0.310 |
041 |
2.15 |
0.318 |
042 |
2.07 |
0.325 |
043 |
2.00 |
0.333 |
044 |
1.93 |
0.341 |
045 |
1.86 |
0.349 |
046 |
1.80 |
0.358 |
047 |
1.73 |
0.366 |
048 |
1.67 |
0.375 |
049 |
1.60 |
0.384 |
050 |
1.54 |
0.393 |
051 |
1.48 |
0.403 |
052 |
1.43 |
0.412 |
053 |
1.37 |
0.422 |
054 |
1.30 |
0.434 |
055 |
1.26 |
0.443 |
056 |
1.20 |
0.455 |
057 |
1.14 |
0.466 |
058 |
1.09 |
0.478 |
059 |
1.05 |
0.489 |
060 |
1.00 |
0.501 |
061 |
0.95 |
0.513 |
062 |
0.90 |
0.525 |
063 |
0.86 |
0.538 |
064 |
0.82 |
0.550 |
065 |
0.77 |
0.564 |
066 |
0.73 |
0.577 |
067 |
0.69 |
0.591 |
068 |
0.65 |
0.605 |
069 |
0.61 |
0.620 |
070 |
0.58 |
0.635 |
071 |
0.54 |
0.650 |
072 |
0.50 |
0.665 |
073 |
0.47 |
0.681 |
074 |
0.43 |
0.698 |
075 |
0.40 |
0.714 |
076 |
0.37 |
0.731 |
077 |
0.34 |
0.749 |
078 |
0.30 |
0.771 |
079 |
0.27 |
0.789 |
080 |
0.24 |
0.808 |
081 |
0.21 |
0.827 |
082 |
0.18 |
0.847 |
083 |
0.15 |
0.867 |
084 |
0.13 |
0.888 |
085 |
0.10 |
0.910 |
086 |
0.07 |
0.931 |
087 |
0.05 |
0.954 |
088 |
0.02 |
0.977 |
089 |
0.00 |
1.000 |
090 |
Note
The exact redshifts of a given snapshot may be slighty different to the above ones. For instance, there are small differences between the exact redshifts of the snapshots in the Astrid and SIMBA suites. In the simulations of the IllustrisTNG suite these numbers can also be slightly different, since AREPO can only write snapshots in the highest time steps in the hierarchy.
Warning
Due to space constraints, we have moved some snapshots to tape. If you need these please reach out.