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high resolution Milky Way dark matter halos simulated on NASA's Columbia and ORNL's Jaguar supercomputers |
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VL-2 data
Will be available here soon...VL-1 data
The data on this page is freely available. When using the z=0 data in publications or proposals, please refer to this web site and to Diemand, Kuhlen & Madau, 2007, ApJ, 657, 262 (astro-ph/0611370). If you use the evolutionary tracks, please cite also Diemand, Kuhlen & Madau, 2007, ApJ, in press (astro-ph/0703337). Raw data (200 snapshots, 7.8 GB each) and other properties of host and subhalos are available on request (diemand 'at' ucolick 'dot' org).Halos and subhalos in the high resolution region of the via lactea run were identified using the 6DFOF halo and subhalo finder (see astro-ph/0603250 and astro-ph/0611370).
redshift zero subhalo properties
vlsubs.txt contains all 6553 halos and subhalos (but not the host halo), which had a peak circular velocity larger than 5 km/s at some time. (Over 40,000 smaller systems can be identified in via lactea, but their abundances and properties are significantly affected by resolution effects and they are therefore not included here.)
| column | units | comments |
|---|---|---|
| GCdistance | kpc | distance from the galactic center |
| peakVmax | km/s | peak of Vmax over the full subhalo history |
| Vmax | km/s | maximum circular velocity = sqrt(GM/r) |
| rVmax | kpc | radius of maximal circular velocity |
| Mtidal | Msun | tidal mass, defined as total mass inside the tidal radius |
| rtidal | kpc | tidal radius (for isolated halos, this radius is set to roughly r_200 instead) |
| rel_pos(3) | kpc | x,y and z coordinates relative to the galactic center |
| rel_vel(3) | km/s | x,y and z components of the velocity relative to the galactic center |
evolutionary tracks of halos and subhalos
Time evolution of properties for the same 6553 objects as above. There is one file for each property, and each line describes one halo, form snapshot 400; z=0 (first column) back in time to snapshot 6; z=16.12 (last column). Only even snapshot numbers were stored and analyzed, i.e. there are 198 columns corresponding to different times. Zeros mean that no progenitor was found for this halo at that time. For list of snapshot number vs. expansion factor and redshift click here.
| property | units | comments |
|---|---|---|
| GCdistance | physical kpc | distance from the galactic center (or from its main progenitor for z>0) |
| CorrectedGCdistance | physical kpc | as above, but for those snapshots closest to a pericenter passage the corrected pericenter distance is given |
| Vmax | physical km/s | maximum circular velocity = sqrt(GM/r) |
| rVmax | physical kpc | radius of maximal circular velocity |
| Mtidal | Msun | mass within the tidal radius |
| rtidal | physical kpc | tidal radius |
| x, y, z | 90 comoving Mpc | x,y and z comoving coordinates (host halo coordinates are given here) |
| vx, vy, vz | 2279.61 comoving km/s | time derivatives of the comoving coordinates. add H(z)*Dx when converting to physical relative velocities (H_0 = 73 km/s/Mpc). |
evolution of the mass distribution around the host halo
This ASCII file gives the mass in spheres of fixed physical radii around the main halo center. Each line contains masses enclosed within 51 spheres [mass unit=1.0779e+17 solar masses]. A list of their radii in physical kpc is given here. The first line is for snapshot number 8 (z=13.63), the last line corresponds to snapshot 400, which is at z=0. For list of snapshot number vs. expansion factor and redshift click here.
The host halo centers and velocities at each snapshot are given here.
last updated: August 6, 2008, by J. Diemand
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This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License,
please acknowledge the via lactea project and/or its authors wherever material from this web site is used. | ||||