ASTRA-DESI DR1 Release v0.14

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 RANDITER values 0–99; filtering on RANDITER >= 0 isolates the random iterations. The Cartesian coordinates assume the Planck18 cosmology provided by astropy.cosmology.Planck18.