Tracing the high-z cosmic web with Quaia: catalogs of voids and clusters in the quasar distribution (CODE AND AUXILIARY FILES)

This repository accompanies "Tracing the high-z cosmic web with Quaia: catalogs of voids and clusters in the quasar distribution", Arsenov et al., 2025 (a link to the paper in A&A will come later). The content of the repository is the code used for the data analysis presented in the publication, for the creation of the figures in the publication and for creating the data products.  Further, the repository contains auxiliary files for reproducing the data products we obtained. An image showing the main data products of the publication is presented below. The data products can be downloaded from CDS. The mocks used in the publication were created by Sinigaglia et al. 2025 (see details below). Both the mock and Quaia data are present in two versions, for our work we used exclusively the version with a G<20.5 cut-off.

The code files contained in this repository is:

• code_analysis_figure_datacreation.ipynb: The code containing the main work flow of the publication. It reproduces our data products, does the data analysis, creates figures. It requires as input the data products uploaded to CDS and the use of the auxiliary files.
• code_for_figures1_2_3.ipynb: Code that creates figures 1, 2 and 3 from the publication
• code_for_figure9.ipynb: Code that creates figure 9 from the publication

The auxiliary files, created as output from Revolver are:

• zobov-voids_members.txt: Contains all the Quaia sources that are parts of voids, their coordinates and void ID
• zobov-clusters_members.txt: Contains all the Quaia sources that are parts of clusters, their coordinates and cluster ID
• zobov-voids_baryC_cat.txt: Contains the barycenters of the voids
• default.trvol: Contains the Voronoi volumes of quasars without corrections to them
• default.vol: Contains the Voronoi volumes of quasars with corrections to them
• default.adj: Contains adjacency information to each Voronoi cell of a quasar
• default.pos: Contains positional information to each quasar

Further auxiliary files provided in this repo are:

• params_run_revolver_on_quaia.py: The parameter file we used to run the Revolver void finder on the Quaia catalogue. The user will need to change the contained file paths accordingly.
• Gaia_mask_sf_NSIDE64_G20.5_final_G>0p52.fits: A selection function file, where we set all values <0.52 to 0 to remove these sky pixels from our analysis. Credit for the original selection function file goes to Storey-Fisher et al. 2023, see below.

The Quaia quasar catalogue and the corresponding selection function map are made publicly available by their authors (Storey-Fisher et al. 2023) https://doi.org/10.5281/zenodo.10403370

The used mocks are from the work "Fast and accurate Gaia-unWISE quasar mock catalogs from LPT and Eulerian bias", Sinigaglia et al. 2025, JCAP, in press, arXiv:2509.15890

The REVOLVER code is also available publicly, with documentation and examples to run it on synthetic or observational data sets https://github.com/seshnadathur/Revolver

Acknowledgments:

The Large-Scale Structure (LSS) research group at Konkoly Observatory has been supported by a Lenduelet excellence grant by the Hungarian Academy of Sciences (MTA). This project has received funding from the European Union’s Horizon Europe research and innovation programme under the Marie Skłodowska-Curie grant agreement number 101130774. Funding for this project was also available in part through the Hungarian National Research, Development and Innovation Office (NKFIH, grants OTKA NN147550 and K134213). L.S.-M was partially supported by the Bulgarian Ministry of Education and Science under Agreement D01-326/04.12.2023. The authors thank Kate Storey-Fisher and the Quaia team for their help with the input quasar catalogue.