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| Định dạng: | Recurso digital |
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Zenodo
2025
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| Những chủ đề: | |
| Truy cập trực tuyến: | https://doi.org/10.5281/zenodo.17716780 |
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- <h1>ASTRA-DESI Data Release 1 (DR1)</h1> <p>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 (<code>.fits.gz</code>) whose first extension (HDU 1) contains the data. File headers store the keywords <code>RELEASE=DR1</code> and the corresponding <code>ZONE</code> label for quick checks.</p> <p>The regions follow the sky boxes defined by Hou et al. (2025, <a href="https://arxiv.org/abs/2508.09070">arXiv:2508.09070</a>):</p> <ul> <li><strong>NGC1</strong> covers 110 ° ≤ RA ≤ 260 ° and -10 ° ≤ DEC ≤ 8 °;</li> <li><strong>NGC2</strong> covers 180 ° ≤ RA ≤ 260 ° and 30 ° ≤ DEC ≤ 40 °.</li> </ul> <table style="width: 30.4101%;"> <thead> <tr> <th style="width: 33.6089%;">Tracer</th> <th style="width: 66.398%;">Number of objects</th> </tr> </thead> <tbody> <tr> <td style="width: 33.6089%;">BGS</td> <td style="width: 66.398%;">240,986</td> </tr> <tr> <td style="width: 33.6089%;">LRG</td> <td style="width: 66.398%;">102,199</td> </tr> <tr> <td style="width: 33.6089%;">ELG</td> <td style="width: 66.398%;">67,456</td> </tr> <tr> <td style="width: 33.6089%;">QSO</td> <td style="width: 66.398%;">87,307</td> </tr> </tbody> </table> <h2>Directory layout</h2> <p>The archive preserves the NERSC production tree. Top-level folders contain:</p> <ul> <li><strong>raw/</strong> – merged real and random catalogues per region.</li> <li><strong>classification/</strong> – neighbour count summaries per tracer and random iteration.</li> <li><strong>probabilities/</strong> – web-type membership probabilities derived from the classification counts.</li> <li><strong>pairs/</strong> – sparse list of target pairs used when counting neighbours.</li> <li><strong>groups/</strong> – FoF group catalogues for objects classified as filaments and voids.</li> </ul> <h2>Naming conventions</h2> <ul> <li><code>raw/zone_REGION.fits.gz</code> – Region NGC1 or NGC2.</li> <li><code>classification/zone_REGION_classified.fits.gz</code> – combined tracer summary for the region.</li> <li><code>probabilities/zone_REGION_probability.fits.gz</code> – per-object web-type probabilities.</li> <li><code>pairs/zone_REGION_pairs.fits.gz</code> – neighbour pairs for the region.</li> <li><code>groups/zone_REGION_groups_fof_filament.fits.gz</code> – filament FoF groups restricted to data targets for all iterations per region.</li> <li><code>groups/zone_REGION_groups_fof_void.fits.gz</code> – void FoF groups for all random iterations per region.</li> </ul> <h2>Column reference</h2> <h3>Raw catalogues (<code>raw/*.fits.gz</code>)</h3> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>TARGETID</td> <td>int64</td> <td>DESI target identifier.</td> </tr> <tr> <td>RA</td> <td>float64</td> <td>Right ascension in degrees.</td> </tr> <tr> <td>DEC</td> <td>float64</td> <td>Declination in degrees.</td> </tr> <tr> <td>Z</td> <td>float64</td> <td>Spectroscopic redshift.</td> </tr> <tr> <td>XCART, YCART, ZCART</td> <td>float64</td> <td>Comoving Cartesian coordinates (Mpc) computed with the Planck18 cosmology.</td> </tr> <tr> <td>TRACERTYPE</td> <td>string</td> <td>Tracer label with suffix <code>_DATA</code> or <code>_RAND</code> (BGS_BRIGHT, ELG, LRG, QSO).</td> </tr> <tr> <td>RANDITER</td> <td>int32</td> <td>-1 for real objects, otherwise the random iteration index (0–99).</td> </tr> </tbody> </table> <p>Random catalogues mirror the data counts for every tracer and random iteration.</p> <h3>Classification catalogues (<code>classification/*.fits.gz</code>)</h3> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>TARGETID</td> <td>int64</td> <td>Identifier of the central object.</td> </tr> <tr> <td>RANDITER</td> <td>int32</td> <td>-1 for data rows, otherwise the random catalogue index.</td> </tr> <tr> <td>ISDATA</td> <td>bool</td> <td><code>True</code> for data rows; <code>False</code> for random iterations.</td> </tr> <tr> <td>NDATA</td> <td>int32</td> <td>Number of neighbour pairs built from data tracers for this target.</td> </tr> <tr> <td>NRAND</td> <td>int32</td> <td>Number of neighbour pairs contributed by random tracers.</td> </tr> <tr> <td>TRACERTYPE</td> <td>string</td> <td>Tracer family (BGS_BRIGHT, ELG, LRG, QSO).</td> </tr> </tbody> </table> <h3>Probability catalogues (<code>probabilities/*.fits.gz</code>)</h3> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>TARGETID</td> <td>int64</td> <td>Identifier of the object.</td> </tr> <tr> <td>TRACERTYPE</td> <td>string</td> <td>Tracer family.</td> </tr> <tr> <td>PVOID</td> <td>float32</td> <td>Probability of the object being a void class.</td> </tr> <tr> <td>PSHEET</td> <td>float32</td> <td>Probability of the sheet class.</td> </tr> <tr> <td>PFILAMENT</td> <td>float32</td> <td>Probability of the filament class.</td> </tr> <tr> <td>PKNOT</td> <td>float32</td> <td>Probability of the knot class.</td> </tr> </tbody> </table> <h3>Pair catalogues (<code>pairs/*.fits.gz</code>)</h3> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>TARGETID1</td> <td>int64</td> <td>Central object in the neighbour pair.</td> </tr> <tr> <td>TARGETID2</td> <td>int64</td> <td>Neighbour contributing to the count.</td> </tr> <tr> <td>RANDITER</td> <td>int32</td> <td>-1 for data pairs, otherwise random catalogue index.</td> </tr> </tbody> </table> <h3>Group catalogues (<code>groups/*.fits.gz</code>)</h3> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>TRACERTYPE</td> <td>string</td> <td>Tracer family.</td> </tr> <tr> <td>TARGETID</td> <td>int64</td> <td>Member identifier.</td> </tr> <tr> <td>RANDITER</td> <td>int32</td> <td>Random iteration index.</td> </tr> <tr> <td>WEBTYPE</td> <td>string</td> <td>Cosmic web class.</td> </tr> <tr> <td>GROUPID</td> <td>int32</td> <td>FoF group label unique within each region.</td> </tr> <tr> <td>NPTS</td> <td>int32</td> <td>Number of members in the group.</td> </tr> <tr> <td>XCM, YCM, ZCM</td> <td>float64</td> <td>Group barycentre in comoving Cartesian coordinates (Mpc).</td> </tr> <tr> <td>A, B, C</td> <td>float64</td> <td>Semi-axis lengths of the inertia ellipsoid (Mpc) ordered A≥B≥C.</td> </tr> <tr> <td>LINKLEN</td> <td>float64</td> <td>FoF linking length.</td> </tr> <tr> <td>ISDATA</td> <td>bool</td> <td><code>True</code> for data rows; <code>False</code> for random iterations.</td> </tr> </tbody> </table> <p>The group finder is executed separately for each tracer. The linking length is computed per tracer and iteration using the analytic comoving volume of the region.</p> <h2>Using the catalogues</h2> <ul> <li>All FITS tables are compressed with <code>gzip</code>.</li> <li>Random catalogues use <code>RANDITER</code> values 0–99; filtering on <code>RANDITER >= 0</code> isolates the random iterations.</li> <li>The Cartesian coordinates assume the Planck18 cosmology provided by <code>astropy.cosmology.Planck18</code>.</li> </ul>