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satellie-ellipticities

A suite of analyses on the spatial distribution of satellite galaxies around their hosts using obersevational satellite data from the SAGA survey and simulated dark matter data from the CosmoSim VSMDPL simulation

Features

  • Compare the distribution of SAGA satellite system ellipticities measured to simulated dark matter subhalo ellipticities
  • Plot features of host galaxy against ellipticity measurements
  • Evaluate the prominence of each satellite or subhalo system with respect to a random distribution

Dependencies

  • Use of public SAGA data requires the installation of the SAGA package
conda install git pip
pip install git+git://github.com/sagasurvey/saga.git
  • VSMDPL data may be similarly downloaded via their website. This package assumes it is downloaded as a parquet
  • all other python dependencies are listed in the requirements.txt file

to install a new conda environment called satellite-ellipticities with all dependencies, run the following inside the top directory

$ conda env create
$ conda activate satellite-ellipticities

or to install packages via pip:

$ pip install -r requirements.txt

Env

  • You need to supply the paths to your local copies of 4 data sets in a .env file which will be gitignored. A fifth environment variable, the SAGA_DB will be a remote path which need also be added to your .env file.