Browsing by Autor "Jaime E. Forero-Romero"

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    ASTRA-DESI DR1 Release v0.6
    (European Organization for Nuclear Research, 2025) Alejandro Palomino; Felipe Leonardo Gómez-Cortés; Xiao-Dong Li; Jaime E. Forero-Romero; Jaime E. Forero-Romero
    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 °. Tracer Number of objects BGS 240,986 LRG 102,199 ELG 67,456 QSO 87,307 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. pairs/ – sparse list of target pairs used when counting neighbours. 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. pairs/zone_REGION_pairs.fits.gz – neighbour pairs for the region. 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). Random catalogues mirror the data counts for every tracer and random iteration. 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 family (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. Pair catalogues (pairs/*.fits.gz) Column Type Description TARGETID1 int64 Central object in the neighbour pair. TARGETID2 int64 Neighbour contributing to the count. RANDITER int32 -1 for data pairs, otherwise random catalogue index. 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.