Halo Finder

We are currently in the process of generating this page which will present you with test suites for halo finders for cosmological simulations. In the meantime please refer to http://popia.ft.uam.es/HaloesGoingMAD for more information.


With the ever-growing possibilities to simulate cosmic structure formation on scales covering a substantial number of orders of magnitude (both in mass and in size), we feel the time is ripe to not only consider and talk about the credibility of the simulation technique but also about the methods of how to actually map the modeled density fields and its physical properties back onto observational quantities.

The tests presented here should mark the first step in that direction…


There are two types of tests available at the moment:

1. mock haloes
2. a full cosmological simulation

Included physics

The mock haloes only include dark matter particles while the cosmological simulation also includes adiabatic gas physics. However, for the comparison project presented in Knebe et al. (2011) only the dark matter has been considered in both cases.

Publications using this test

  • Muldrew, Pearce & Power (2011)
  • Knebe et al. (2011)

Details of setup

Units and constants

very important please specify the units and physical constants adopted in the test. This is usually only relevant for understanding the initial conditions and set-up. The following units/constants are an example; they will not all be relevant for every test:

mass_unit = ?
velocity_unit = ?
length_unit = ?
time_unit = ?
energy_per_unit_mass_unit = ?
gas_const ?
thermal energy U = ?

adiabatic index gamma=5/3
mean molar mass, mu=1.0

You may prefer to specify the units using LaTeX, e.g.:



All data files can be found over here: http://popia.ft.uam.es/public/HaloesGoingMAD/DATA

As all files are in GADGET format you can also find a tiny toll read_gadget.tgz at the same location.

It would be good to always add the following: Please see File Formats for a description of the above file formats and a collection of conversion tools.

How to analyse the test?

Describe here how the test is analysed and how it can be compared with results from other simulations, or to analytic results. It would be helpful to include a link to the analysis software used. It would be good to always add the following: Please see Analysis Tools to obtain the above analysis tools.


List here some example results from the test and describe their implications. Typically this will mean posting a couple of results figures.

Tests run so far

Describe here the software used to perform the test and the results. We recommend using separate pages for each piece of software, though many can be presented simultaneously if this is more convenient. The former is more work, but is also more easily expanded upon in the future. Please store these tests in the namespace indcodetests, e.g.:


so that these do not appear in the menu in the side bar.

Code Person Publication
The Template Test: myfavecode Bob

Discussion forum for this test

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