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Simulation Details:

ParameterValueDescription
nameIllustris-2simulation name
name altL75n910FPalternative simulation name
descriptionIntermediate resolution (level 2) Illustris run including the full physics model.short description of run
boxsize75000.0side length of simulation box [ckpc/h]
mass gas0.0007085424average gas cell mass [10^10 msun/h] (0=no gas)
mass dm0.00352717219489dark matter particle mass [10^10 msun/h]
num dm753571000number of dark matter particles
num tr mc753571000number 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-2 has [136] snapshots available, with 23.4 TB total data volume.

Over all snapshots, have 83,135,795 FoF groups, 75,614,755 Subfind groups, and 203,186,937,107 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 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
1 44.56 0.058 13.694 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
2 42.45 0.062 13.690 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
3 40.64 0.066 13.686 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
4 38.71 0.071 13.681 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
5 36.87 0.076 13.676 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
6 35.12 0.082 13.670 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
7 33.61 0.087 13.665 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
8 32.01 0.094 13.658 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
9 30.48 0.100 13.651 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
10 29.03 0.108 13.644 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
11 27.64 0.116 13.636 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
12 26.44 0.123 13.628 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
13 25.17 0.132 13.619 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
14 23.96 0.142 13.609 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
15 22.81 0.153 13.599 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
16 21.81 0.163 13.589 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
17 20.76 0.175 13.577 753571000 0 0 0 0   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
18 19.75 0.188 13.564 753570999 1 0 1 1   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
19 18.79 0.201 13.550 753570998 8 0 2 2   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
20 17.96 0.215 13.537 753571005 10 0 12 12   [Snapshot] (176.9 GB)   [Groupcat] (1.2 MB)
21 17.09 0.231 13.521 753570988 57 0 45 45   [Snapshot] (176.9 GB)   [Groupcat] (1.3 MB)
22 16.25 0.248 13.504 753571068 129 0 125 125   [Snapshot] (176.9 GB)   [Groupcat] (1.5 MB)
23 15.45 0.266 13.486 753571270 386 0 345 344   [Snapshot] (176.9 GB)   [Groupcat] (2.1 MB)
24 14.76 0.283 13.468 753571771 749 0 782 784   [Snapshot] (176.9 GB)   [Groupcat] (3.2 MB)
25 14.03 0.304 13.447 753572960 1719 0 1761 1765   [Snapshot] (176.9 GB)   [Groupcat] (5.7 MB)
26 13.34 0.327 13.425 753575234 3634 0 3689 3711   [Snapshot] (176.9 GB)   [Groupcat] (10.5 MB)
27 12.67 0.351 13.401 753579407 6817 0 6980 7010   [Snapshot] (176.9 GB)   [Groupcat] (14.1 MB)
28 12.04 0.376 13.375 753584669 13111 0 12584 12648   [Snapshot] (176.9 GB)   [Groupcat] (18.9 MB)
29 11.50 0.401 13.350 753590752 21466 0 20390 20489   [Snapshot] (176.9 GB)   [Groupcat] (26.0 MB)
30 10.92 0.431 13.321 753597653 36587 0 33296 33501   [Snapshot] (176.9 GB)   [Groupcat] (37.0 MB)
31 10.37 0.463 13.289 753597727 59678 1 51405 51770   [Snapshot] (176.9 GB)   [Groupcat] (52.8 MB)
32 10.00 0.486 13.265 753588417 83974 9 67834 68323   [Snapshot] (176.9 GB)   [Groupcat] (66.7 MB)
33 9.84 0.497 13.255 753580798 95100 9 76003 76570   [Snapshot] (176.9 GB)   [Groupcat] (73.8 MB)
34 9.39 0.529 13.222 753538618 139682 15 104389 105056   [Snapshot] (176.9 GB)   [Groupcat] (98.1 MB)
35 9.00 0.560 13.191 753465480 194483 43 134799 135770   [Snapshot] (176.9 GB)   [Groupcat] (124.1 MB)
36 8.91 0.568 13.183 753438815 209954 43 143082 144267   [Snapshot] (176.9 GB)   [Groupcat] (131.3 MB)
37 8.45 0.610 13.141 753256794 309020 99 189739 190956   [Snapshot] (176.9 GB)   [Groupcat] (171.2 MB)
38 8.01 0.655 13.096 752961804 430823 148 243828 245554   [Snapshot] (176.8 GB)   [Groupcat] (217.7 MB)
39 7.60 0.703 13.048 752507670 597245 294 305537 307293   [Snapshot] (176.8 GB)   [Groupcat] (270.5 MB)
40 7.24 0.750 13.002 751932502 777615 423 366089 368526   [Snapshot] (176.8 GB)   [Groupcat] (322.6 MB)
41 7.01 0.782 12.969 751446238 920443 562 408462 411199   [Snapshot] (176.7 GB)   [Groupcat] (359.0 MB)
42 6.86 0.805 12.947 751083400 1025835 729 437446 440331   [Snapshot] (176.7 GB)   [Groupcat] (383.9 MB)
43 6.49 0.864 12.888 749952657 1332074 1218 513037 516254   [Snapshot] (176.6 GB)   [Groupcat] (448.7 MB)
44 6.14 0.927 12.824 748701499 1697298 1545 589737 593837   [Snapshot] (176.5 GB)   [Groupcat] (514.7 MB)
45 6.01 0.954 12.797 748041514 1856711 1914 620276 624846   [Snapshot] (176.4 GB)   [Groupcat] (541.1 MB)
46 5.85 0.989 12.763 747343089 2037930 2347 656741 648613   [Snapshot] (176.3 GB)   [Groupcat] (564.6 MB)
47 5.53 1.061 12.690 746241977 2352300 2773 724258 713987   [Snapshot] (176.2 GB)   [Groupcat] (621.0 MB)
48 5.23 1.139 12.613 745013673 2767220 3879 785075 774403   [Snapshot] (176.1 GB)   [Groupcat] (672.8 MB)
49 5.00 1.205 12.546 743836839 3156962 4516 827647 818315   [Snapshot] (176.0 GB)   [Groupcat] (709.9 MB)
50 4.94 1.223 12.529 743506968 3267596 4504 838275 827809   [Snapshot] (176.0 GB)   [Groupcat] (718.3 MB)
51 4.66 1.312 12.439 741766317 3917496 6044 882779 869708   [Snapshot] (175.9 GB)   [Groupcat] (754.8 MB)
52 4.43 1.399 12.353 740243592 4415699 6786 914420 898349   [Snapshot] (175.7 GB)   [Groupcat] (780.0 MB)
53 4.18 1.501 12.251 738495487 5001058 8566 943104 921559   [Snapshot] (175.6 GB)   [Groupcat] (801.2 MB)
54 4.01 1.577 12.175 737212065 5462796 9485 956184 931846   [Snapshot] (175.5 GB)   [Groupcat] (810.7 MB)
55 3.94 1.611 12.141 736637269 5702700 10471 962242 934706   [Snapshot] (175.4 GB)   [Groupcat] (814.0 MB)
56 3.71 1.728 12.023 734723107 6416578 11472 973456 941528   [Snapshot] (175.3 GB)   [Groupcat] (820.9 MB)
57 3.49 1.855 11.897 732693190 7261146 13525 978848 941446   [Snapshot] (175.1 GB)   [Groupcat] (822.2 MB)
58 3.28 1.990 11.762 730581249 8219896 14427 978838 937966   [Snapshot] (175.0 GB)   [Groupcat] (820.1 MB)
59 3.08 2.134 11.617 728498904 9209559 16559 974761 932119   [Snapshot] (174.9 GB)   [Groupcat] (815.6 MB)
60 3.01 2.195 11.556 727639976 9675498 17710 971718 928997   [Snapshot] (174.8 GB)   [Groupcat] (812.9 MB)
61 2.90 2.289 11.462 726372755 10357019 18782 967035 925063   [Snapshot] (174.7 GB)   [Groupcat] (809.4 MB)
62 2.73 2.438 11.313 724884101 11467558 19559 958979 918410   [Snapshot] (174.7 GB)   [Groupcat] (803.3 MB)
63 2.58 2.596 11.155 722917957 12695919 21743 948871 911184   [Snapshot] (174.6 GB)   [Groupcat] (796.4 MB)
64 2.44 2.745 11.006 721216114 13792320 22469 940344 904878   [Snapshot] (174.5 GB)   [Groupcat] (790.5 MB)
65 2.32 2.902 10.849 719436418 15001100 23188 931670 899304   [Snapshot] (174.4 GB)   [Groupcat] (784.9 MB)
66 2.21 3.047 10.705 717909472 16147125 23942 924229 893267   [Snapshot] (174.4 GB)   [Groupcat] (779.4 MB)
67 2.10 3.198 10.554 716371835 17341033 24739 917060 888195   [Snapshot] (174.4 GB)   [Groupcat] (774.6 MB)
68 2.00 3.356 10.396 714758337 18621354 25394 909095 882342   [Snapshot] (174.3 GB)   [Groupcat] (769.0 MB)
69 1.90 3.522 10.230 713213403 19861841 27128 902006 875729   [Snapshot] (174.3 GB)   [Groupcat] (763.3 MB)
70 1.82 3.669 10.082 711850322 20971030 27699 897803 870913   [Snapshot] (174.2 GB)   [Groupcat] (759.3 MB)
71 1.74 3.823 9.928 710518929 22074645 28325 892704 865464   [Snapshot] (174.2 GB)   [Groupcat] (754.7 MB)
72 1.67 3.983 9.769 709153268 23199213 27779 888389 860436   [Snapshot] (174.2 GB)   [Groupcat] (750.6 MB)
73 1.60 4.120 9.631 708055554 24106206 28435 885771 856696   [Snapshot] (174.2 GB)   [Groupcat] (747.7 MB)
74 1.53 4.291 9.460 706661007 25305438 28935 880468 851213   [Snapshot] (174.1 GB)   [Groupcat] (743.1 MB)
75 1.47 4.438 9.313 705522928 26312542 29482 875416 845985   [Snapshot] (174.1 GB)   [Groupcat] (738.7 MB)
76 1.41 4.590 9.161 704380808 27343322 29932 871297 840913   [Snapshot] (174.1 GB)   [Groupcat] (734.6 MB)
77 1.36 4.747 9.005 703273939 28393952 30414 868480 836057   [Snapshot] (174.1 GB)   [Groupcat] (730.9 MB)
78 1.30 4.908 8.844 702146848 29424419 29902 865289 831829   [Snapshot] (174.1 GB)   [Groupcat] (727.6 MB)
79 1.25 5.074 8.678 701041530 30445801 30334 861335 826680   [Snapshot] (174.1 GB)   [Groupcat] (723.5 MB)
80 1.21 5.210 8.542 700143546 31276367 30850 858968 822684   [Snapshot] (174.1 GB)   [Groupcat] (720.5 MB)
81 1.15 5.384 8.367 699012084 32354506 31270 855393 817377   [Snapshot] (174.1 GB)   [Groupcat] (716.4 MB)
82 1.11 5.527 8.224 698139698 33171709 30852 853278 813462   [Snapshot] (174.0 GB)   [Groupcat] (713.5 MB)
83 1.07 5.674 8.078 697269597 33990600 31345 851054 810041   [Snapshot] (174.0 GB)   [Groupcat] (710.9 MB)
84 1.04 5.824 7.928 696384787 34861246 31814 849571 806523   [Snapshot] (174.0 GB)   [Groupcat] (708.4 MB)
85 1.00 5.977 7.775 695559408 35651945 31383 846226 802180   [Snapshot] (174.0 GB)   [Groupcat] (704.9 MB)
86 0.99 6.015 7.736 695333979 35880986 31288 846107 801270   [Snapshot] (174.0 GB)   [Groupcat] (704.3 MB)
87 0.95 6.172 7.579 694488354 36694417 31661 844915 797871   [Snapshot] (174.0 GB)   [Groupcat] (702.0 MB)
88 0.92 6.292 7.459 693797772 37363907 32243 843626 795123   [Snapshot] (174.0 GB)   [Groupcat] (700.0 MB)
89 0.89 6.455 7.296 692997152 38140909 31814 842231 791151   [Snapshot] (174.0 GB)   [Groupcat] (697.3 MB)
90 0.85 6.622 7.130 692104413 38995386 32199 840581 787404   [Snapshot] (174.0 GB)   [Groupcat] (694.6 MB)
91 0.82 6.791 6.960 691263502 39848257 31815 840242 783130   [Snapshot] (174.0 GB)   [Groupcat] (691.9 MB)
92 0.79 6.921 6.831 690661313 40424366 32201 838801 780487   [Snapshot] (174.0 GB)   [Groupcat] (690.0 MB)
93 0.76 7.096 6.656 689835537 41282942 32590 838863 776985   [Snapshot] (174.0 GB)   [Groupcat] (687.9 MB)
94 0.73 7.230 6.522 689277359 41848707 32268 838511 774194   [Snapshot] (174.0 GB)   [Groupcat] (686.1 MB)
95 0.70 7.411 6.340 688421414 42708594 32597 838910 770835   [Snapshot] (174.0 GB)   [Groupcat] (684.2 MB)
96 0.68 7.550 6.202 687862849 43287956 32275 839695 767799   [Snapshot] (174.0 GB)   [Groupcat] (682.5 MB)
97 0.64 7.737 6.015 687076812 44076657 32615 840216 763910   [Snapshot] (174.0 GB)   [Groupcat] (680.3 MB)
98 0.62 7.880 5.872 686517267 44667578 32284 840761 761708   [Snapshot] (174.0 GB)   [Groupcat] (679.1 MB)
99 0.60 8.024 5.727 685988488 45236503 32742 841789 759350   [Snapshot] (174.0 GB)   [Groupcat] (678.0 MB)
100 0.58 8.171 5.581 685497149 45800667 32401 841639 756581   [Snapshot] (174.0 GB)   [Groupcat] (676.2 MB)
101 0.55 8.369 5.383 684770167 46536403 32719 842387 752896   [Snapshot] (174.0 GB)   [Groupcat] (674.2 MB)
102 0.52 8.520 5.232 684218372 47113780 32368 843620 750742   [Snapshot] (174.1 GB)   [Groupcat] (673.2 MB)
103 0.50 8.672 5.079 683704397 47631103 32748 844141 748044   [Snapshot] (174.1 GB)   [Groupcat] (671.7 MB)
104 0.48 8.827 4.925 683200987 48172911 32475 845194 745530   [Snapshot] (174.1 GB)   [Groupcat] (670.5 MB)
105 0.46 8.983 4.769 682679652 48699740 32818 847430 743368   [Snapshot] (174.1 GB)   [Groupcat] (669.7 MB)
106 0.44 9.141 4.610 682188249 49232362 32523 849348 740664   [Snapshot] (174.1 GB)   [Groupcat] (668.6 MB)
107 0.42 9.301 4.451 681684200 49736103 32798 851085 738108   [Snapshot] (174.1 GB)   [Groupcat] (667.5 MB)
108 0.40 9.463 4.289 681214595 50231638 32522 852174 735441   [Snapshot] (174.1 GB)   [Groupcat] (666.1 MB)
109 0.38 9.626 4.125 680714979 50728641 32854 854855 732850   [Snapshot] (174.1 GB)   [Groupcat] (665.2 MB)
110 0.36 9.791 3.960 680287086 51196534 32524 857603 730475   [Snapshot] (174.1 GB)   [Groupcat] (664.5 MB)
111 0.35 9.902 3.849 679948077 51540768 32925 859514 729223   [Snapshot] (174.1 GB)   [Groupcat] (664.2 MB)
112 0.33 10.070 3.681 679532411 51975962 32605 862896 726765   [Snapshot] (174.1 GB)   [Groupcat] (663.5 MB)
113 0.31 10.240 3.511 679060540 52465968 32912 865128 724371   [Snapshot] (174.1 GB)   [Groupcat] (662.7 MB)
114 0.29 10.411 3.340 678669016 52874518 32602 867341 722242   [Snapshot] (174.1 GB)   [Groupcat] (661.9 MB)
115 0.27 10.585 3.167 678221223 53338375 32351 868934 720019   [Snapshot] (174.1 GB)   [Groupcat] (660.9 MB)
116 0.26 10.701 3.051 677943155 53616830 32703 869459 718881   [Snapshot] (174.1 GB)   [Groupcat] (660.4 MB)
117 0.24 10.876 2.875 677529545 54055298 32411 871117 717072   [Snapshot] (174.1 GB)   [Groupcat] (659.7 MB)
118 0.23 11.054 2.698 677115889 54481287 32721 871184 714698   [Snapshot] (174.1 GB)   [Groupcat] (658.3 MB)
119 0.21 11.173 2.579 676869623 54748077 32489 871856 713737   [Snapshot] (174.1 GB)   [Groupcat] (657.9 MB)
120 0.20 11.353 2.399 676434853 55194713 32806 873711 711741   [Snapshot] (174.1 GB)   [Groupcat] (657.1 MB)
121 0.18 11.534 2.218 676100823 55559645 32554 875089 709656   [Snapshot] (174.1 GB)   [Groupcat] (656.2 MB)
122 0.17 11.656 2.096 675836579 55829788 32353 876272 708496   [Snapshot] (174.1 GB)   [Groupcat] (655.8 MB)
123 0.15 11.839 1.912 675467244 56212796 32666 878035 706507   [Snapshot] (174.1 GB)   [Groupcat] (655.0 MB)
124 0.14 11.963 1.789 675225856 56465246 32447 879073 705348   [Snapshot] (174.1 GB)   [Groupcat] (654.6 MB)
125 0.13 12.149 1.603 674854540 56859430 32720 882625 703746   [Snapshot] (174.1 GB)   [Groupcat] (654.5 MB)
126 0.11 12.336 1.415 674546023 57196025 32420 885497 702315   [Snapshot] (174.1 GB)   [Groupcat] (654.3 MB)
127 0.10 12.462 1.289 674309770 57443690 32272 886903 700624   [Snapshot] (174.1 GB)   [Groupcat] (653.7 MB)
128 0.08 12.652 1.100 673977846 57795659 32455 889498 698846   [Snapshot] (174.1 GB)   [Groupcat] (653.2 MB)
129 0.07 12.779 0.972 673757203 58033154 32283 892036 697896   [Snapshot] (174.1 GB)   [Groupcat] (653.3 MB)
130 0.06 12.971 0.780 673417436 58382714 32548 895541 696187   [Snapshot] (174.1 GB)   [Groupcat] (653.1 MB)
131 0.05 13.100 0.652 673229328 58595881 32363 897531 694995   [Snapshot] (174.1 GB)   [Groupcat] (652.9 MB)
132 0.03 13.294 0.458 672885800 58955279 32590 900158 693514   [Snapshot] (174.1 GB)   [Groupcat] (652.6 MB)
133 0.02 13.424 0.327 672696049 59159895 32438 902427 692159   [Snapshot] (174.1 GB)   [Groupcat] (652.4 MB)
134 0.01 13.620 0.131 672382479 59491493 32141 903591 690851   [Snapshot] (174.1 GB)   [Groupcat] (651.9 MB)
135 0.00 13.752 0.000 672164948 59714583 32451 904903 689785   [Snapshot] (174.1 GB)   [Groupcat] (651.6 MB)

Merger Trees:

Illustris-2 has the SubLink merger trees available. In addition to progenitor/descendant connectivity, it includes essentially all properties from the Subfind group catalogs.

Illustris-2 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-2 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-2 has the Subhalo Matching To Dark catalog available.

Illustris-2 has the Blackhole Mergers catalog available.

Illustris-2 has the Blackhole Details catalog available.

Illustris-2 has the Stellar Assembly catalog available.