{"paper":{"title":"3D shape of Orion A from Gaia DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alvaro Hacar, Alyssa Goodman, Andreas Burkert, Andre Moitinho, Charles J. Lada, Christine Ackerl, Daniel Mortimer, Eleonora Zari, Gabor Herbst-Kiss, Herve Bouy, Irati Larreina, Jan Forbrich, Joana Ascenso, Joao Alves, Josefa E. Grossschedl, Kieran Leschinski, Marco Lombardi, Stefan Meingast, Verena Fuernkranz","submitted_at":"2018-08-17T18:00:00Z","abstract_excerpt":"We use the $\\mathit{Gaia}$ DR2 distances of about 700 mid-infrared selected young stellar objects in the benchmark giant molecular cloud Orion A to infer its 3D shape and orientation. We find that Orion A is not the fairly straight filamentary cloud that we see in (2D) projection, but instead a cometary-like cloud oriented toward the Galactic plane, with two distinct components: a denser and enhanced star-forming (bent) Head, and a lower density and star-formation quieter $\\sim$75 pc long Tail. The true extent of Orion A is not the projected $\\sim$40 pc but $\\sim$90 pc, making it by far the la"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05952","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":""},"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"}