This is a code intended to identify and qualify galaxy clusters in large multi-band galaxy photometric surveys.

1. 2 tilings of the sky - including overlaps
   • wtiles for detection
   • ptiles for characterization
2. generate redshift slices
3. computation of global survey quantities
4. for each wtile
   • loop over redshift slices for detection
   • merge detections over slices
   • refine redshift of detections
5. concatenate detections over all tiles
6. for each ptile
   • loop over clusters:estimate richness and membership
7. concatenate richnesses and membership
8. merge detections and richnesses

The input galaxy catalogs are expected to be located in one directory as a list of fits files corresponding to a spatial partitioning based on Healpix with Nside=64. It can be nested of ring - this is specified in the data configuration file. Each file is named as #hpixel.fits

The associated masks/footprints are expected to follow the same structure and be named as #hpixel_footprint.fits. Note that there is also the option to have the footprint as a single file, which can be convenient for relatively small surveys.

These are described in the 'input_data_structure' section of the data config file.

The division of the sky in tiles offers an easy way to parallelize the code, which is now orchestrated by SLURM.

wazp_main generates and launches 4 sbatch scripts in array mode with dependencie:

• wazp_tile (step 4 in the workflow)
• wazp_concatenate (step 5)
• pmem_tile (step 6)
• pmem_concatenate (steps 7 and 8)

Create an environment with Conda:

conda create -n wazp python=3.11
conda activate wazp
conda install -c conda-forge cfitsio=3.430
conda install -c cta-observatory sparse2d
conda install -c conda-forge pip

Clone the repository:

git clone https://github.com/linea-it/wazp

Install WaZP with:

cd wazp/
python setup.py install

or

pip install wazp/

or, for developers

pip install -e wazp/

python [wazp/script path]/wazp_main.py wazp.cfg [wazp path]/data.cfg

Can be launched from anywhere. Outputs are written in the wazp.cfg file under -workdir- Make sure data.cfg describes your data and its location on disc.