Baryonic Acoustic Oscillations

These data were generated as part of the research described in astro-ph/0607061. Please reference that paper if you make use of any of the catalogs or derived products below.

A Wiki containing useful links for BAO research can be found by following this link or see Daniel Eisenstein's clearing house for acoustic peak research. There are also some introductory lectures on BAO from the 2007 Santa Fe cosmology workshop or the 2008 Summer School at IUCCA or the 2010 Summer School on Redshift surveys and large-scale structure in Beijing.

Simulations & mock catalogs

The mock catalogs were created from 3 large volume N-body simulations, each of which evolved 10243 particles in a 1.1Gpc/h volume. The cosmology was of the LCDM family with OmegaM=0.3, OmegaB=0.046, h=0.7, n=1 and sigma8=0.9. For this cosmology the sound horizon, s=143Mpc or 100Mpc/h. The three simulations are called respectively runs 2, 3 and 4. Run 1 is a fictitious run which contains aggregate information from the other runs.

For each output we generate a catalog of halos using the Friends-of-Friends algorithm with a linking length of b = 0.175 in units of the mean inter-particle spacing. We generate mock galaxy catalogs using a halo model prescription with a simple HOD. The first 4 catalogs contain only the halos in the simulation, while the other 32 implement the HOD below. In all there are 4 sequences of models with different number densities [10-3 or 10-3.5 (Mpc/h)3] and power-law slopes [a=1.0 or 0.5] for the satellites:

N(M) = Theta(M-Mmin)[ 1 + ({M-Mmin}/M1)a ]

Details of the procedure used to make the mock catalogs can be found in astro-ph/0607061. Each run contains subdirectories for the different redshifts, and within each subdirectory the files "box_*.gal" contain the catalogs. There is one line per galaxy, with the columns being position, velocity, group number of the hosting halo and luminosity. For these catalogs the luminosity is 1.0 for all galaxies (i.e. it is not used). The positions are in units of the box length (i.e. run from [0,1) for all coordinates) and the velocities are stored as a distance offset in the same units. To go into redshift space one simply adds the velocity offset to the relevant coordinate. For example if we view the box down the z-axis the redshift space coordinate of the particle is (x,y,z+vz).

Model log10nbar log10Mmin log10M1 a
1 -- 12.0 25.0 1.0
2 -- 12.5 25.0 1.0
3 -- 13.0 25.0 1.0
4 -- 13.5 25.0 1.0
5 -3.0 12.8 13.0 1.0
6 -3.0 12.8 13.0 1.0
7 -3.0 12.7 13.5 1.0
8 -3.0 12.7 13.5 1.0
9 -3.0 12.6 14.0 1.0
10 -3.0 12.6 14.0 1.0
11 -3.0 12.6 14.5 1.0
12 -3.0 12.6 14.5 1.0
13 -3.5 13.3 13.0 1.0
14 -3.5 13.3 13.0 1.0
15 -3.5 13.1 13.5 1.0
16 -3.5 13.1 13.5 1.0
17 -3.5 13.0 14.0 1.0
18 -3.5 13.0 14.0 1.0
19 -3.5 13.0 14.5 1.0
20 -3.5 13.0 14.5 1.0
21 -3.0 12.8 13.0 0.5
22 -3.0 12.8 13.0 0.5
23 -3.0 12.7 13.5 0.5
24 -3.0 12.7 13.5 0.5
25 -3.0 12.6 14.0 0.5
26 -3.0 12.6 14.0 0.5
27 -3.0 12.6 14.5 0.5
28 -3.0 12.6 14.5 0.5
29 -3.5 13.2 13.0 0.5
30 -3.5 13.2 13.0 0.5
31 -3.5 13.1 13.5 0.5
32 -3.5 13.1 13.5 0.5
33 -3.5 13.1 14.0 0.5
34 -3.5 13.1 14.0 0.5
35 -3.5 13.0 14.5 0.5
36 -3.5 13.0 14.5 0.5

The parameters of the HOD used to make the mock catalogs. In each case where we have satellites we make two realizations of the same HOD. Densities are in (Mpc/h)3 and masses in Msun/h.

Auxilliary data

We also make available for each of the runs auxilliary data such as power spectra and correlation functions.

Index of BAO

NameSize (MB)Last modified
bao_iucca.pdf 72008/08/07
beijing10.pdf 62010/06/16
checksum.pl 02006/08/04
models.dat 02006/07/04
Run1 02006/07/21
Run2 02007/01/25
Run3 02006/07/21
Run4 02006/07/21
SantaFe07.pdf 22007/07/08

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Last modified Wed Jun 16 20:35:32 2010