{"paper":{"title":"SDSS-V LVM: Revealing the Physical and Chemical Structure of the Helix Nebula","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. J. Mej\\'ia-Narv\\'aez, A. Roman-Lopes, A. Singh, A. Villa-Durango, A. Wofford, A. Z. Lugo-Aranda, C. G. Rom\\'an-Z\\'u\\~niga, C. Morisset, E. Egorova, E. J. Johnston, G. A. Blanc, Guy S. Stringfellow, H. Ibarra-Medel, I. Cruz-Gonzalez, I. Yu. Katkov, J. A. Toal\\'a, J. E. M\\'endez-Delgado, J. R. Brownstein, L. C. Casta\\~neda-Carlos, L. Hern\\'andez-Mart\\'inez, L. Sabin, M\\'onica, M. Pe\\~na, O. Arangur\\'e, Oleg V. Egorov, R. de J. Zerme\\~no, R. Orozco-Duarte, S. F. S\\'anchez, S. Torres-Peimbert, W. J. Henney","submitted_at":"2026-06-09T19:22:14Z","abstract_excerpt":"We present the first spatially contiguous study of the physical and chemical structure of the Helix Nebula (NGC~7293, PNG 036.1-57.1) based on integral-field spectroscopy from the SDSS-V Local Volume Mapper (LVM). The wide-field observations provide nearly complete spectroscopic coverage of the nebula, enabling a spaxel-by-spaxel analysis of extinction, electron density and temperature, ionisation structure, and chemical abundances. We reconstruct calibrated datacubes from the LVM row-stacked spectra and measure 41 optical emission lines, including hydrogen, helium, and collisionally excited m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.11394","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.11394/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}