{"paper":{"title":"Probing large-scale wind structures in Vela X-1 using off-states with INTEGRAL","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"2-Cahill Center, 3-University of Alicante, 4-ESA/ESAC, 5-ISDC, 6-CRESST UMD, 7) (1-INAF-IASF Milano, 7-NASA GSFC, A. Paizis (1), Caltech, E. Bozzo (5), F. Fuerst (2), Italy, J.M. Torrejon (3), K. Pottschmidt (6, L. Sidoli (1), P. Kretschmar (4), Spain, Switzerland, USA, USA), Versoix","submitted_at":"2014-11-28T13:55:33Z","abstract_excerpt":"Vela X-1 is the prototype of the class of wind-fed accreting pulsars in high mass X-ray binaries hosting a supergiant donor. We have analyzed in a systematic way ten years of INTEGRAL data of Vela X-1 (22-50 keV) and we found that when outside the X-ray eclipse, the source undergoes several luminosity drops where the hard X-rays luminosity goes below 3x10^35 erg/s, becoming undetected by INTEGRAL. These drops in the X-ray flux are usually referred to as \"off-states\" in the literature. We have investigated the distribution of these off-states along the Vela X-1 ~8.9 d orbit, finding that their "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7869","kind":"arxiv","version":2},"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"}