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Simulation Details:

ParameterValueDescription
nameIllustris-3simulation name
name altL75n455FPalternative simulation name
descriptionLow resolution (level 3) Illustris run including the full physics model.short description of run
boxsize75000.0side length of simulation box [ckpc/h]
mass gas0.0056683392average gas cell mass [10^10 msun/h] (0=no gas)
mass dm0.0282173775591dark matter particle mass [10^10 msun/h]
num dm94196375number of dark matter particles
num tr mc94196375number of gas tracer particles
z start127.0starting redshift (e.g. z=99)
z final0.0ending redshift (e.g. z=0)
cosmologyWMAP-9short description of cosmological parameters (e.g. 'WMAP-7')
omega 00.2726total matter density (e.g. 0.27)
omega L0.7274dark energy density (e.g. 0.73)
omega B0.0456baryonic matter density (e.g. 0.04)
hubble0.704hubble constant 'little h' in units of [100 km/s/Mpc]
physics modelFiducial Illustris Modelshort description of implemented physics models
has coolingTrueradiative gas cooling (false for non-radiative runs)
has starformationTruestar formation (false for non-radiative runs)
has windsTruegalactic-scale winds from star formation feedback (fiducial parameters)
has blackholesTruesupermassive blackhole formation, accretion, and feedback channels, fiducial parameters
is uniformTrueuniform mass, full periodic, cosmological volume
is subboxFalsenon-periodic subbox embedded within a larger volume (high time resolution)
has fofTrue[friends of friends] group catalogs exist
has subfindTrue[subfind] group catalogs exist
has rockstarFalse[rockstar] group catalogs exist
has lhalotreeTrue[lhalotree] merger tree exists
has sublinkTrue[sublink] merger tree exists
has ctreesFalse[consistent trees] merger tree exists

Snapshot List:

Illustris-3 has [136] snapshots available, with 2.9 TB total data volume.

Over all snapshots, have 12,239,976 FoF groups, 12,210,169 Subfind groups, and 25,466,080,593 particles.

Snapshot
[#]
Redshift Age
[Gyr]
Lookback
[Gyr]
Gas Cells
[#]
Stars
[#]
BHs
[#]
FoF
Groups [#]
Subfind
Groups [#]
Download
Snapshot
Download
FoF & Subfind
0 46.77 0.054 13.698 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
1 44.56 0.058 13.694 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
2 42.45 0.062 13.690 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
3 40.64 0.066 13.686 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
4 38.71 0.071 13.681 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
5 36.87 0.076 13.676 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
6 35.12 0.082 13.670 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
7 33.61 0.087 13.665 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
8 32.01 0.094 13.658 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
9 30.48 0.100 13.651 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
10 29.03 0.108 13.644 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
11 27.64 0.116 13.636 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
12 26.44 0.123 13.628 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
13 25.17 0.132 13.619 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
14 23.96 0.142 13.609 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
15 22.81 0.153 13.599 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
16 21.81 0.163 13.589 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
17 20.76 0.175 13.577 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
18 19.75 0.188 13.564 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
19 18.79 0.201 13.550 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
20 17.96 0.215 13.537 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
21 17.09 0.231 13.521 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
22 16.25 0.248 13.504 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
23 15.45 0.266 13.486 94196375 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
24 14.76 0.283 13.468 94196376 0 0 0 0   [Snapshot] (22.1 GB)   [Groupcat] (153.8 KB)
25 14.03 0.304 13.447 94196383 0 0 5 5   [Snapshot] (22.1 GB)   [Groupcat] (213.7 KB)
26 13.34 0.327 13.425 94196411 3 0 12 12   [Snapshot] (22.1 GB)   [Groupcat] (247.1 KB)
27 12.67 0.351 13.401 94196479 8 0 44 44   [Snapshot] (22.1 GB)   [Groupcat] (496.1 KB)
28 12.04 0.376 13.375 94196671 25 0 110 110   [Snapshot] (22.1 GB)   [Groupcat] (1023.0 KB)
29 11.50 0.401 13.350 94197035 64 0 227 227   [Snapshot] (22.1 GB)   [Groupcat] (1.2 MB)
30 10.92 0.431 13.321 94197789 166 0 479 479   [Snapshot] (22.1 GB)   [Groupcat] (1.4 MB)
31 10.37 0.463 13.289 94199186 356 1 931 935   [Snapshot] (22.1 GB)   [Groupcat] (1.8 MB)
32 10.00 0.486 13.265 94200573 622 5 1365 1369   [Snapshot] (22.1 GB)   [Groupcat] (2.2 MB)
33 9.84 0.497 13.255 94201338 797 5 1623 1630   [Snapshot] (22.1 GB)   [Groupcat] (2.5 MB)
34 9.39 0.529 13.222 94203927 1442 11 2693 2701   [Snapshot] (22.1 GB)   [Groupcat] (3.4 MB)
35 9.00 0.560 13.191 94207135 2366 33 3979 4003   [Snapshot] (22.1 GB)   [Groupcat] (4.5 MB)
36 8.91 0.568 13.183 94208136 2669 33 4358 4372   [Snapshot] (22.1 GB)   [Groupcat] (4.8 MB)
37 8.45 0.610 13.141 94213383 4691 90 6633 6697   [Snapshot] (22.1 GB)   [Groupcat] (6.8 MB)
38 8.01 0.655 13.096 94218032 7851 141 9794 9900   [Snapshot] (22.1 GB)   [Groupcat] (9.6 MB)
39 7.60 0.703 13.048 94222360 12452 277 14002 14145   [Snapshot] (22.1 GB)   [Groupcat] (13.3 MB)
40 7.24 0.750 13.002 94222406 18532 383 18581 18771   [Snapshot] (22.1 GB)   [Groupcat] (17.2 MB)
41 7.01 0.782 12.969 94220218 23592 545 22258 22493   [Snapshot] (22.1 GB)   [Groupcat] (20.5 MB)
42 6.86 0.805 12.947 94217143 27794 725 24865 25174   [Snapshot] (22.1 GB)   [Groupcat] (22.8 MB)
43 6.49 0.864 12.888 94202397 40034 1187 32320 32763   [Snapshot] (22.1 GB)   [Groupcat] (29.3 MB)
44 6.14 0.927 12.824 94175204 55502 1521 40590 41217   [Snapshot] (22.1 GB)   [Groupcat] (36.6 MB)
45 6.01 0.954 12.797 94158989 63977 1893 44196 44829   [Snapshot] (22.1 GB)   [Groupcat] (39.7 MB)
46 5.85 0.989 12.763 94135063 73922 2333 48609 49261   [Snapshot] (22.1 GB)   [Groupcat] (43.5 MB)
47 5.53 1.061 12.690 94076034 98630 2771 58292 59141   [Snapshot] (22.1 GB)   [Groupcat] (52.0 MB)
48 5.23 1.139 12.613 94003613 124964 3940 68677 69692   [Snapshot] (22.1 GB)   [Groupcat] (61.1 MB)
49 5.00 1.205 12.546 93932628 150105 4617 77297 78547   [Snapshot] (22.1 GB)   [Groupcat] (68.7 MB)
50 4.94 1.223 12.529 93913337 155761 4606 79432 80744   [Snapshot] (22.1 GB)   [Groupcat] (70.6 MB)
51 4.66 1.312 12.439 93799076 195705 6121 89700 91354   [Snapshot] (22.1 GB)   [Groupcat] (79.7 MB)
52 4.43 1.399 12.353 93680890 235103 6941 99016 100911   [Snapshot] (22.1 GB)   [Groupcat] (87.9 MB)
53 4.18 1.501 12.251 93530128 282689 8738 108687 110984   [Snapshot] (22.1 GB)   [Groupcat] (96.5 MB)
54 4.01 1.577 12.175 93418847 317377 9731 115093 117708   [Snapshot] (22.1 GB)   [Groupcat] (102.3 MB)
55 3.94 1.611 12.141 93367414 335887 10804 117855 120539   [Snapshot] (22.0 GB)   [Groupcat] (104.7 MB)
56 3.71 1.728 12.023 93191366 392551 11793 125918 129014   [Snapshot] (22.0 GB)   [Groupcat] (111.9 MB)
57 3.49 1.855 11.897 92999539 457517 14028 133155 136694   [Snapshot] (22.0 GB)   [Groupcat] (118.5 MB)
58 3.28 1.990 11.762 92799088 532096 15034 139334 143356   [Snapshot] (22.0 GB)   [Groupcat] (124.1 MB)
59 3.08 2.134 11.617 92586456 612450 17331 144544 148627   [Snapshot] (22.0 GB)   [Groupcat] (128.7 MB)
60 3.01 2.195 11.556 92496193 650936 18574 146227 150571   [Snapshot] (22.0 GB)   [Groupcat] (130.3 MB)
61 2.90 2.289 11.462 92368243 703094 19720 148200 152840   [Snapshot] (22.0 GB)   [Groupcat] (132.2 MB)
62 2.73 2.438 11.313 92197752 790425 20673 151265 156151   [Snapshot] (22.0 GB)   [Groupcat] (135.0 MB)
63 2.58 2.596 11.155 91988560 890371 22906 153293 158214   [Snapshot] (21.9 GB)   [Groupcat] (136.8 MB)
64 2.44 2.745 11.006 91818640 976686 23755 154378 159605   [Snapshot] (21.9 GB)   [Groupcat] (137.9 MB)
65 2.32 2.902 10.849 91644359 1067820 24608 154946 160312   [Snapshot] (21.9 GB)   [Groupcat] (138.5 MB)
66 2.21 3.047 10.705 91494881 1153939 25417 155243 160306   [Snapshot] (21.9 GB)   [Groupcat] (138.5 MB)
67 2.10 3.198 10.554 91344836 1245620 26207 155095 160599   [Snapshot] (21.9 GB)   [Groupcat] (138.7 MB)
68 2.00 3.356 10.396 91200092 1338483 26923 155424 160186   [Snapshot] (21.9 GB)   [Groupcat] (138.5 MB)
69 1.90 3.522 10.230 91056262 1432466 28891 154776 159492   [Snapshot] (21.9 GB)   [Groupcat] (137.9 MB)
70 1.82 3.669 10.082 90934177 1517784 29564 154203 159030   [Snapshot] (21.9 GB)   [Groupcat] (137.5 MB)
71 1.74 3.823 9.928 90809789 1603664 30216 153517 158112   [Snapshot] (21.9 GB)   [Groupcat] (136.7 MB)
72 1.67 3.983 9.769 90686622 1693142 29674 152630 157287   [Snapshot] (21.9 GB)   [Groupcat] (136.0 MB)
73 1.60 4.120 9.631 90589746 1763028 30355 151898 156575   [Snapshot] (21.9 GB)   [Groupcat] (135.4 MB)
74 1.53 4.291 9.460 90473416 1851268 30921 150785 155398   [Snapshot] (21.9 GB)   [Groupcat] (134.4 MB)
75 1.47 4.438 9.313 90373636 1927149 31500 150180 154722   [Snapshot] (21.9 GB)   [Groupcat] (133.8 MB)
76 1.41 4.590 9.161 90277963 2004316 32095 149161 153378   [Snapshot] (21.9 GB)   [Groupcat] (132.7 MB)
77 1.36 4.747 9.005 90180326 2084658 32650 148420 152493   [Snapshot] (21.9 GB)   [Groupcat] (132.0 MB)
78 1.30 4.908 8.844 90085829 2165133 32074 147193 151385   [Snapshot] (21.9 GB)   [Groupcat] (131.0 MB)
79 1.25 5.074 8.678 89992956 2240422 32540 146264 150337   [Snapshot] (21.9 GB)   [Groupcat] (130.2 MB)
80 1.21 5.210 8.542 89917166 2300041 33105 145692 149774   [Snapshot] (21.9 GB)   [Groupcat] (129.7 MB)
81 1.15 5.384 8.367 89817570 2383319 33502 144731 148516   [Snapshot] (21.9 GB)   [Groupcat] (128.7 MB)
82 1.11 5.527 8.224 89740221 2447729 32991 143560 147523   [Snapshot] (21.9 GB)   [Groupcat] (127.7 MB)
83 1.07 5.674 8.078 89670121 2504867 33469 143287 146764   [Snapshot] (21.9 GB)   [Groupcat] (127.2 MB)
84 1.04 5.824 7.928 89589987 2573345 33999 142285 145744   [Snapshot] (21.9 GB)   [Groupcat] (126.3 MB)
85 1.00 5.977 7.775 89521297 2634624 33473 141680 144987   [Snapshot] (21.9 GB)   [Groupcat] (125.7 MB)
86 0.99 6.015 7.736 89500389 2651473 33349 141616 144888   [Snapshot] (21.9 GB)   [Groupcat] (125.6 MB)
87 0.95 6.172 7.579 89433926 2710197 33827 140710 143855   [Snapshot] (21.9 GB)   [Groupcat] (124.8 MB)
88 0.92 6.292 7.459 89377791 2762259 34430 139915 143185   [Snapshot] (21.9 GB)   [Groupcat] (124.2 MB)
89 0.89 6.455 7.296 89309765 2820788 33909 139347 142324   [Snapshot] (21.8 GB)   [Groupcat] (123.5 MB)
90 0.85 6.622 7.130 89242009 2880581 34283 138710 141447   [Snapshot] (21.8 GB)   [Groupcat] (122.8 MB)
91 0.82 6.791 6.960 89169163 2947863 33775 138214 140674   [Snapshot] (21.8 GB)   [Groupcat] (122.2 MB)
92 0.79 6.921 6.831 89120336 2990179 34313 137889 140077   [Snapshot] (21.8 GB)   [Groupcat] (121.8 MB)
93 0.76 7.096 6.656 89051228 3050365 34699 137232 139290   [Snapshot] (21.8 GB)   [Groupcat] (121.1 MB)
94 0.73 7.230 6.522 89003811 3094354 34284 136778 138683   [Snapshot] (21.8 GB)   [Groupcat] (120.6 MB)
95 0.70 7.411 6.340 88934178 3153719 34723 136690 137865   [Snapshot] (21.8 GB)   [Groupcat] (120.1 MB)
96 0.68 7.550 6.202 88893400 3195565 34306 136441 137459   [Snapshot] (21.8 GB)   [Groupcat] (119.8 MB)
97 0.64 7.737 6.015 88828831 3252983 34666 135960 136559   [Snapshot] (21.8 GB)   [Groupcat] (119.1 MB)
98 0.62 7.880 5.872 88779311 3298630 34262 135509 135893   [Snapshot] (21.8 GB)   [Groupcat] (118.6 MB)
99 0.60 8.024 5.727 88735925 3338591 34712 135029 135482   [Snapshot] (21.8 GB)   [Groupcat] (118.2 MB)
100 0.58 8.171 5.581 88683022 3380619 34263 134841 134697   [Snapshot] (21.8 GB)   [Groupcat] (117.7 MB)
101 0.55 8.369 5.383 88626147 3434375 34539 134698 134181   [Snapshot] (21.8 GB)   [Groupcat] (117.4 MB)
102 0.52 8.520 5.232 88578754 3478231 34128 134282 133635   [Snapshot] (21.8 GB)   [Groupcat] (116.9 MB)
103 0.50 8.672 5.079 88536337 3514334 34557 133970 133104   [Snapshot] (21.8 GB)   [Groupcat] (116.5 MB)
104 0.48 8.827 4.925 88495872 3554831 34129 133620 132552   [Snapshot] (21.8 GB)   [Groupcat] (116.1 MB)
105 0.46 8.983 4.769 88456020 3590127 34519 133369 131930   [Snapshot] (21.8 GB)   [Groupcat] (115.7 MB)
106 0.44 9.141 4.610 88416766 3629193 34119 132948 131422   [Snapshot] (21.8 GB)   [Groupcat] (115.2 MB)
107 0.42 9.301 4.451 88375399 3664927 34529 133012 130982   [Snapshot] (21.8 GB)   [Groupcat] (115.0 MB)
108 0.40 9.463 4.289 88332363 3704495 34106 132703 130467   [Snapshot] (21.8 GB)   [Groupcat] (114.6 MB)
109 0.38 9.626 4.125 88291015 3739442 34482 132791 130138   [Snapshot] (21.8 GB)   [Groupcat] (114.4 MB)
110 0.36 9.791 3.960 88252627 3775638 34016 132881 129679   [Snapshot] (21.8 GB)   [Groupcat] (114.2 MB)
111 0.35 9.902 3.849 88225795 3799831 34536 132933 129344   [Snapshot] (21.8 GB)   [Groupcat] (114.0 MB)
112 0.33 10.070 3.681 88190914 3831675 34077 132714 128837   [Snapshot] (21.8 GB)   [Groupcat] (113.6 MB)
113 0.31 10.240 3.511 88150416 3866487 34464 132868 128333   [Snapshot] (21.8 GB)   [Groupcat] (113.4 MB)
114 0.29 10.411 3.340 88116011 3897493 34008 132650 127787   [Snapshot] (21.8 GB)   [Groupcat] (113.0 MB)
115 0.27 10.585 3.167 88076350 3932331 33562 132654 127447   [Snapshot] (21.8 GB)   [Groupcat] (112.8 MB)
116 0.26 10.701 3.051 88052360 3951004 34095 132763 127175   [Snapshot] (21.8 GB)   [Groupcat] (112.6 MB)
117 0.24 10.876 2.875 88018114 3984179 33659 132629 126878   [Snapshot] (21.8 GB)   [Groupcat] (112.4 MB)
118 0.23 11.054 2.698 87981607 4013108 34043 132525 126463   [Snapshot] (21.8 GB)   [Groupcat] (112.1 MB)
119 0.21 11.173 2.579 87960758 4032819 33746 132597 126101   [Snapshot] (21.8 GB)   [Groupcat] (111.9 MB)
120 0.20 11.353 2.399 87936031 4063420 34152 132613 125596   [Snapshot] (21.8 GB)   [Groupcat] (111.6 MB)
121 0.18 11.534 2.218 87905608 4090307 33736 132436 125158   [Snapshot] (21.8 GB)   [Groupcat] (111.3 MB)
122 0.17 11.656 2.096 87883188 4110344 33476 132154 125030   [Snapshot] (21.8 GB)   [Groupcat] (111.2 MB)
123 0.15 11.839 1.912 87853381 4136205 33876 132485 124691   [Snapshot] (21.8 GB)   [Groupcat] (111.1 MB)
124 0.14 11.963 1.789 87829864 4155209 33577 132354 124339   [Snapshot] (21.8 GB)   [Groupcat] (110.8 MB)
125 0.13 12.149 1.603 87796737 4183333 33984 132696 123993   [Snapshot] (21.8 GB)   [Groupcat] (110.7 MB)
126 0.11 12.336 1.415 87769626 4209634 33490 132505 123645   [Snapshot] (21.8 GB)   [Groupcat] (110.4 MB)
127 0.10 12.462 1.289 87750282 4226051 33216 132254 123417   [Snapshot] (21.8 GB)   [Groupcat] (110.2 MB)
128 0.08 12.652 1.100 87723453 4252451 33612 132692 123101   [Snapshot] (21.8 GB)   [Groupcat] (110.2 MB)
129 0.07 12.779 0.972 87703466 4269513 33314 132557 122865   [Snapshot] (21.8 GB)   [Groupcat] (110.0 MB)
130 0.06 12.971 0.780 87675276 4294102 33691 132626 122582   [Snapshot] (21.8 GB)   [Groupcat] (109.8 MB)
131 0.05 13.100 0.652 87659669 4310171 33390 132463 122230   [Snapshot] (21.8 GB)   [Groupcat] (109.6 MB)
132 0.03 13.294 0.458 87631061 4335378 33771 132172 121795   [Snapshot] (21.8 GB)   [Groupcat] (109.2 MB)
133 0.02 13.424 0.327 87615583 4349541 33469 132010 121607   [Snapshot] (21.8 GB)   [Groupcat] (109.1 MB)
134 0.01 13.620 0.131 87589542 4373420 33018 131737 121329   [Snapshot] (21.8 GB)   [Groupcat] (108.8 MB)
135 0.00 13.752 0.000 87571556 4388167 33582 131727 121209   [Snapshot] (21.8 GB)   [Groupcat] (108.8 MB)

Merger Trees:

Illustris-3 has the SubLink merger trees available. In addition to progenitor/descendant connectivity, it includes essentially all properties from the Subfind group catalogs.

Illustris-3 has the LHaloTree merger trees available. The tree contains the connectivity between progenitors and descendants across different snapshots, as well as most important properties from the Subfind group catalogs.

Illustris-3 does not currently have the Consistent Trees (Rockstar) merger trees available.

Note: Extracting sub-trees for individual galaxies or halos

The merger trees are generally quite large. If you are interested in making a galaxy/halo selection based on a complex criterion related to assembly history, merger history, etc, then you will need to download the full tree files. If, however, you are only looking to study the merger history of a few galaxies/halos, you should instead consider extracting sub-trees on the fly using the Web API.

Supplementary Data Catalogs:

Illustris-3 has the Subhalo Matching To Dark catalog available.

Illustris-3 has the Blackhole Mergers catalog available.

Illustris-3 has the Blackhole Details catalog available.

Illustris-3 has the Stellar Assembly catalog available.