ASTRA-DESI DR1 Release v0.14
Authors/Creators
- 1. Universidad Nacional de Colombia
- 2. Universidad de Antioquia
- 3. Universidad de los Andes
Description
ASTRA-DESI Data Release 1 (DR1)
This record bundles the ASTRA-DESI DR1 products for the two DESI survey regions (NGC and SGC). Every catalogue is delivered as a compressed FITS binary table (.fits.gz) whose first extension (HDU 1) contains the data. File headers store the keywords RELEASE=DR1 and the corresponding ZONE label for quick checks.
| Tracer | Number of objects |
|---|---|
| BGS ANY | 5,522,353 |
| BGS BRIGHT | 3,957,865 |
| LRG | 2,138,627 |
| ELG | 2,432,072 |
| QSO | 1,223,401 |
Directory layout
The archive preserves the NERSC production tree. Top-level folders contain:
- raw/ – merged real and random catalogues per region.
- classification/ – neighbour count summaries per tracer and random iteration.
- probabilities/ – web-type membership probabilities derived from the classification counts.
Naming conventions
raw/zone_REGION_TRACER.fits.gz– Region NGC or SGC.classification/TRACER/REGION/zone_REGION_TRACER_classified_iterXXX.fits.gz– combined tracer summary for the region.probabilities/TRACER/REGION/TRACER_REGION_TRACER_probability_iterdata.fits.gz– per-object web-type probabilities.properties/zone_REGION_properties.fits.gz– per-object properties.void_catalogs/voids_TRACER_REGION.fits.gz– watershed-based void catalogs.
Column reference
Raw catalogues (raw/*.fits.gz)
| Column | Type | Description |
|---|---|---|
| TARGETID | int64 | DESI target identifier. |
| RA | float64 | Right ascension in degrees. |
| DEC | float64 | Declination in degrees. |
| Z | float64 | Spectroscopic redshift. |
| XCART, YCART, ZCART | float64 | Comoving Cartesian coordinates (Mpc) computed with the Planck18 cosmology. |
| TRACERTYPE | string | Tracer label with suffix _DATA or _RAND (BGS_BRIGHT, ELG, LRG, QSO). |
| RANDITER | int32 | -1 for real objects, otherwise the random iteration index (0–99). |
Properties catalogues (properties/*.fits.gz)
| Column | Type | Description |
|---|---|---|
| TARGETID | int64 | DESI target identifier. |
| SED_SFR | float64 | Star formation rate derived from SED fitting. |
| SED_MASS | float64 | Stellar mass derived from SED fitting. |
| FLUX_G | float64 | Observed flux in the g photometric band. |
| FLUX_R | float64 | Observed flux in the r photometric band. |
Each raw file merges all tracers for its zone. Random catalogues mirror the data counts for every tracer and random iteration.
Additional columns SED_SFR, SED_MASS, FLUX_G, and FLUX_R were incorporated from the DESI DR1 value-added catalogues associated with the emission-line sample: https://data.desi.lbl.gov/doc/releases/dr1/vac/stellar-mass-emline/. These quantities are derived via SED fitting using CIGALE (Zou et al. 2024).
Classification catalogues (classification/*.fits.gz)
| Column | Type | Description |
|---|---|---|
| TARGETID | int64 | Identifier of the central object. |
| RANDITER | int32 | -1 for data rows, otherwise the random catalogue index. |
| ISDATA | bool | True for data rows; False for random iterations. |
| NDATA | int32 | Number of neighbour pairs built from data tracers for this target. |
| NRAND | int32 | Number of neighbour pairs contributed by random tracers. |
| TRACERTYPE | string | Tracer (BGS_ANY, BGS_BRIGHT, ELG, LRG, QSO). |
Probability catalogues (probabilities/*.fits.gz)
| Column | Type | Description |
|---|---|---|
| TARGETID | int64 | Identifier of the object. |
| TRACERTYPE | string | Tracer family. |
| PVOID | float32 | Probability of the object being a void class. |
| PSHEET | float32 | Probability of the sheet class. |
| PFILAMENT | float32 | Probability of the filament class. |
| PKNOT | float32 | Probability of the knot class. |
Consensus void catalogues (void_catalogs/*.fits.gz)
The void catalogues contain the final ASTRA consensus samples constructed independently for each tracer (BGS_ANY, BGS_BRIGHT, LRG, ELG, and QSO) and survey region (NGC and SGC). Each catalogue combines 100 random realizations and retains voids with support in more than half of them (FRAC_V > 0.5).
Files follow the naming convention voids_TRACER_REGION.fits.gz.
| Column | Type | Description |
|---|---|---|
| VOID_ID | int64 | Globally unique void identifier inherited from the representative realization. |
| SRC_ITER | int32 | Random realization (0–99) containing the representative void. |
| X, Y, Z | float64 | Comoving Cartesian coordinates of the void centre in Mpc/h. |
| R_EFF | float64 | Effective void radius in Mpc/h, derived from the eigenvalues of the member-distribution moment tensor. |
| ELLIP | float64 | Void ellipticity, defined as 1 - ((EIGVAL_3 + EIGVAL_2) / (EIGVAL_2 + EIGVAL_1))^(1/4). |
| EIGVAL_1, EIGVAL_2, EIGVAL_3 | float64 | Moment-tensor eigenvalues in (Mpc/h)2, ordered as EIGVAL_1 ≥ EIGVAL_2 ≥ EIGVAL_3. |
| EIGVEC_1_X, EIGVEC_1_Y, EIGVEC_1_Z | float64 | Cartesian components of the unit eigenvector associated with the major void axis. |
| EIGVEC_2_X, EIGVEC_2_Y, EIGVEC_2_Z | float64 | Cartesian components of the unit eigenvector associated with the intermediate void axis. |
| EIGVEC_3_X, EIGVEC_3_Y, EIGVEC_3_Z | float64 | Cartesian components of the unit eigenvector associated with the minor void axis. |
| V | int32 | Number of random realizations contributing a vote to the consensus void. |
| FRAC_V | float64 | Consensus support fraction, defined as V / 100. Published objects satisfy FRAC_V > 0.5. |
| N_ABSORBED | int32 | Number of overlapping consensus representatives removed and absorbed by this void during duplicate pruning. |
Using the catalogues
- All FITS tables are compressed with
gzip. - Random catalogues use
RANDITERvalues 0–99; filtering onRANDITER >= 0isolates the random iterations. - The Cartesian coordinates assume the Planck18 cosmology provided by
astropy.cosmology.Planck18.
Files
Additional details
Related works
- Cites
- Journal article: 10.1093/rasti/rzaf032 (DOI)
- Preprint: arXiv:2604.01456 (arXiv)
- Is supplemented by
- Preprint: arXiv:2503.14745 (arXiv)
Software
- Repository URL
- https://github.com/forero/ASTRA-DESI
- Programming language
- Python , Shell
- Development Status
- Active