Catalog of triply ionized carbon (CIV) absorbers based on DESI DR1 Quasars. This repo also includes the catalog file for DESI DR1 Quasars that were searched for CIV absorbers.

The FITS files containing the C IV absorbers and the parent quasar sample are stored in the data/ folder. For details on the structure and contents of the C IV absorber catalog and the quasar catalog searched for absorbers, please refer to data/README.md.

Two Jupyter notebooks are also provided with basic functions to explore the C IV absorber and parent QSO catalogs.

The catalog construction and data details can be found in Anand et al. 2025. Please cite the paper if you use this catalog in your research. The BibTeX entry for the paper can be found here. Additionally, please cite Anand et al. 2021, which first developed this algorithm.

The codebase used to build this catalog can be found here: qsoabsfind. If you find this catalog useful in your work, please consider starring this and the codebase repositories.

Please also cite the codebase via Zenodo: zenodo.org/records/15685771.

DESI DR1 is publicly available at: https://data.desi.lbl.gov/doc/releases/dr1/

This catalog is also officially part of the Value-Added Catalogs (VACs) of the DESI DR1 database and can be downloaded from: DESI DR1 CIV VAC.

If you have any suggestions or questions, feel free to open an issue. I’ll be happy to take a look and try to resolve it.

Thanks,
Abhijeet Anand
Lawrence Berkeley National Lab