ASTRA-DESI Data Release 1 (DR1)

This record bundles the ASTRA-DESI DR1 products for the two DESI survey regions (NGC1 and NGC2). 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.

The regions follow the sky boxes defined by Hou et al. (2025, arXiv:2508.09070):

• NGC1 covers 110 ° ≤ RA ≤ 260 ° and -10 ° ≤ DEC ≤ 8 °;
• NGC2 covers 180 ° ≤ RA ≤ 260 ° and 30 ° ≤ DEC ≤ 40 °.

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.fits.gz – Region NGC1 or NGC2.
• classification/zone_REGION_classified.fits.gz – combined tracer summary for the region.
• probabilities/zone_REGION_probability.fits.gz – per-object web-type probabilities.

Column reference

Raw catalogues (raw/*.fits.gz)

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 EDR 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)

Probability catalogues (probabilities/*.fits.gz)

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.