WaZP version 2.0

WaZP short description

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

WaZP workflow

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

Important assumption

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.

WaZP with SLURM

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)

Installation

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/

Execution

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.