README.md

---
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---

# DESI EDR × Euclid AstroPT Q1 Dataset

## Dataset Description

This dataset contains the cross-matched catalog between **DESI Early Data Release (EDR)** and sample of **Quick Data Release 1 (Q1)** data from Euclid Consortium: Siudek et al. 2025 ([arXiv:2503.15312](https://ui.adsabs.harvard.edu/abs/2025arXiv250315312E/abstract)).

### Dataset Summary

- **Total Sources**: 15,263 galaxies
- **Cross-match Radius**: 0.5 arcsec
- **Data Products**: 
  - Euclid VIS imaging
  - Euclid NISP imaging (Y, J, H bands)
  - DESI spectra with spectroscopic redshifts
  - metadata: catalog of DESI logM and Z values.  
    For more details, see [Siudek et al. 2024](https://ui.adsabs.harvard.edu/abs/2024A%26A...691A.308S/abstract) and [Siudek et al. 2025b](https://ui.adsabs.harvard.edu/abs/2025A%26A...700A.209S/abstract).  
    The metadata catalog is available at https://huggingface.co/datasets/msiudek/astroPT_euclid_metadata (e.g., select entries where DESI_TARGETID is not null).

## Source Data

### DESI Sample Selection
Applied quality cuts to DESI EDR:
- `ZCAT_PRIMARY == True`
- `ZWARN == 0` or `ZWARN == 4`
- `COADD_FIBERSTATUS == 0`
- `SPECTYPE != 'STAR'`
- `Z > 0`

### Euclid Sample Selection
From Euclid Consortium: Siudek et al. 2025 ([arXiv:2503.15312](https://ui.adsabs.harvard.edu/abs/2025arXiv250315312E/abstract)).

## Usage

```python
from datasets import load_dataset

dataset = load_dataset("msiudek/astroPT_euclid_desi_dataset")
```

## Citation

If you use this dataset, please cite:

**Siudek et al. 2025**

```bibtex
@ARTICLE{2025arXiv250315312S,
       author = {{Siudek}, M. and collaborators},
        title = "{Euclid Consortium Paper Title}",
      journal = {arXiv e-prints},
         year = 2025,
        month = mar,
          eid = {arXiv:2503.15312},
        pages = {arXiv:2503.15312},
archivePrefix = {arXiv},
       eprint = {2503.15312},
}

@dataset{euclid_desi_edr_q1,
  author = {Siudek, M. and collaborators},
  title = {DESI EDR × Euclid Q1 Cross-matched Dataset},
  year = {2025},
  publisher = {Hugging Face},
  url = {https://huggingface.co/datasets/msiudek/astroPT_euclid_desi_dataset}
}
```