All halo catalogues have been generated with AHF and the format is described on pages 162++ in the user's guide.
You are most likely only interested in the _halos files which contain a variety of properties (position, velocity, mass, radius, etc.) of identified halos:
01 | haloid | unique haloid across all snapshots |
02 | hostHalo | haloid of host halo |
03 | numSubStruct | number of subhaloes |
04 | Mass_bound | exclusive bound mass (npart*mp) in [Msun/h] |
05 | npart | exclusive number of particles |
06 | X | |
07 | Y | halo position in [kpc/h] |
08 | Z | |
09 | Vx | |
10 | Vy | halo physical velocity in [km/sec] |
11 | Vz | |
12 | Radius |
[kpc/h] |
13 | Rmax | position where GM(<r)/r peaks |
14 | r2 | scale radius in [kpc/h] |
15 | mbp_offset | most-bound-particle position to (X,Y,Z) offset |
16 | com_offset | centre-of-mass to (X,Y,Z) offset |
17 | Vmax | peak value of GM(<r)/r |
18 | Vesc | escape velocity at radius(12) |
19 | sigV | 3D velocity dispersion |
20 | lambda | abs(total angular momentum)/Mass_bound/sqrt(2.*G*Mass_bound*Effective_radius) |
21 | lambdaE | Peebles (1991) spin parameter |
22 | Lx | |
23 | Ly | orientation of angular momentum |L|=1 |
24 | Lz | |
25 | b/a | (normalized) second largest axis of moment of inertia |
26 | c/a | (normalized) third largest axis of moment of inertia tensor |
27 | Eax | |
28 | Eay | largest axis of moment of inertia tensor |Ea|=1 |
29 | Eaz | |
30 | Ebx | |
31 | Eby | second largest axis of moment of inertia tensor |Eb|=1 |
32 | Ebz | |
33 | Ecx | |
34 | Ecy | third largest axis of moment of inertia tensor |Ec|=1 |
35 | Ecz | |
36 | ovdens | overdensity at radius(12) |
37 | nbins | number of bins used for radial profile |
38 | fMhires | fraction of mass in high-resolution particles |
39 | Ekin | kinetic energy [Msun/h (km/sec)^2)] |
40 | Epot | potential energy [Msun/h (km/sec)^2)] |
41 | SurfP | surface pressure term [Msun/h (km/sec)^2)] |
42 | Phi0 | potential normalisation [(km/sec)^2] |
43 | cNFW | NFW concentration |
44++ | for the NR and FP runs there are even more columns, please check the user's guide for their meaning |
The _luminosities and _magnitudes files available for the full physics runs were generated with the STARDUST code (Devriendt et al. 1999); they contain for each identified halo the luminosity/magnitude in 19 different wavebands (same ordering of haloes as in the _halos file). Note that stars residing in subhaloes are not contributing to the luminosities of the halo; if you want luminosities where those are included, that will not pose a problem: contact one of the organizers...
All snaphots written by the respective code have been converted to the same format, i.e. GADGET's file format 2.
The galaxy catalogues are all written in the nIFTy galaxy format:
Header line:
Z_solar L_solar
01 | haloid | ID of dark matter halo as found in merger tree |
02 | galaxyhostid | ID of host DM halo to which this galaxy last belonged |
03 | galaxy_is_orphan | flag indicating whether the host DM halo still exists (0, no orphan galaxy) or not (1, orphan galaxy) |
04 | X | galaxy X position in comoving [kpc/h] |
05 | Y | galaxy Y position in comoving [kpc/h] |
06 | Z | galaxy Z position in comoving [kpc/h] |
07 | Vx | galaxy X physical peculiar velocity [km/sec] |
08 | Vy | galaxy Y physical peculiar velocity [km/sec] |
09 | Vz | galaxy Z physical peculiar velocity [km/sec] |
10 | Mcold | cold gas mass [Msun/h] |
11 | Mhot | hot gas mass [Msun/h] |
12 | Mstar | stellar mass [Msun/h] |
13 | Mbh | mass of central black hole [Msun/h] |
14 | Z_gas | metalicity of the cold gas in the galaxy [Zsolar] |
15 | Z_stars | metalicity of stars [Zsolar] |
16 | T_stars | mean age of stellar population [Gyrs] |
17 | SFR | star formation rate [Msun/h yr^(-1)] |
18 | SFRbulge | star formation rate in the bulge [Msun/h yr^(-1)] |
19 | M_hot,halo |
mass of hot gas in the diffuse halo/atmosphere [Msun/h] |
20 | M_cold,halo | mass of cold gas in the diffuse halo: cold flows, cooling flows [Msun/h] |
21 |
Meject | mass of gas ejected from the halo [Msun/h] |
22 | M_outflowed | mass of gas outflowed from galaxy but retained within the halo [Msun/h] |
23 | M_gas,disk | mass of gas in the disk [Msun/h] |
24 | M_gas,spheroid | mass of gas in the spheroid/bulge [Msun/h] |
25 | M_stars,disk | mass of stars in the disk [Msun/h] |
26 | M_stars,spheroid | mass of stars in the spheroid/bulge [Msun/h] |
27 | M_bh | total mass of black hole(s) [Msun/h] |
28 | M_ICstars | mass of stars in intracluster mass (i.e. stripped stars) [Msun/h] |
29 | M_total | total baryons associated to the halo, including ejected mass [Msun/h] |
30 |
MZ_hot,halo |
mass of metals in hot gas in the diffuse halo/atmosphere [Msun/h] |
31 | MZ_cold,halo | mass of metals in cold gas in the diffuse halo [Msun/h] |
32 |
MZeject | mass of metals in gas ejected from the halo [Msun/h] |
33 | MZ_outflowed | mass of metals in gas outflowed from galaxy but retained within the halo [Msun/h] |
34 | MZ_gas,disk | mass of metals in gas in the disk [Msun/h] |
35 | MZ_gas,spheroid | mass of metals in gas in the spheroid/bulge [Msun/h] |
36 | MZ_stars,disk | mass of metals in stars in the disk [Msun/h] |
37 | MZ_stars,spheroid | mass of metals in stars in the spheroid/bulge [Msun/h] |
38 | MZ_bh | total mass of metals in black hole(s) [Msun/h] |
39 | MZ_ICstars | mass of metals in stars in intracluster mass (i.e. stripped stars) [Msun/h] |
40 | BoverT | bulge-to-total stellar mass ratio (total=bulge+disc) |
41 | r1/2 | overall half-mass radius in physical [kpc/h] |
42 | r1/2_bulge | 3D half-mass radius of bulge in physical [kpc/h] |
43 | r1/2_disk | half-mass radius of disk in physical [kpc/h] |
44 | nuv_ext | Rest-frame absolute AB magnitude for the Galex NUV band (around 2200\AA) with dust |
45 | B_ext | Rest-frame absolute AB magnitude for the RGO B band (around 4369\AA) with dust |
46 | V_ext | Rest-frame absolute AB magnitude for the RGO V band (around 54038\AA) with dust |
47 | g_ext | Rest-frame absolute AB magnitude for the SDSS g band (around 4260\AA) with dust |
48 | r_ext | Rest-frame absolute AB magnitude for the SDSS r band (around 5605\AA) with dust |
49 | K_ext | Rest-frame absolute AB magnitude for the UKIDSS K band (around 2.1\um) with dust |
50 | nuv | Rest-frame absolute AB magnitude for the Galex NUV band (around 2200\AA) without dust |
51 | B | Rest-frame absolute AB magnitude for the RGO B band (around 4369\AA) without dust |
52 | V | Rest-frame absolute AB magnitude for the RGO V band (around 54038\AA) without dust |
53 | g | Rest-frame absolute AB magnitude for the SDSS g band (around 4260\AA) without dust |
54 | r | Rest-frame absolute AB magnitude for the SDSS r band (around 5605\AA) without dust |
55 | K | Rest-frame absolute AB magnitude for the UKIDSS K band (around 2.1\um) without dust |