{"paper":{"title":"Sagittarius B2 Main: A Cluster of Ultra-Compact HII Regions and Massive Protostellar Cores","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Jun-Hui Zhao, M. C. H. Wright","submitted_at":"2011-08-03T19:15:08Z","abstract_excerpt":"The ionized core in the Sgr B2 Main star-forming region was imaged using the Submillimeter Array archival data observed for the H26$\\alpha$ line and continuum emission at 0.86 millimeter with an angular resolution 0.3\\arcsec. Eight hyper-compact H26$\\alpha$ emission sources were detected with a typical size in the range of 1.6--20$\\times10^2$ AU and electron density of 0.3--3$\\times10^7$ cm$^{-3}$, corresponding to the emission measure 0.4--8.4$\\times10^{10}$ cm$^{-6}$ pc. The H26$\\alpha$ line fluxes from the eight hyper-compact HII sources imply that the ionization for each of the sources mus"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.0916","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"}