{"paper":{"title":"A powerful flare from Sgr A* confirms the synchrotron nature of the X-ray emission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Goldwurm, A. Merloni, C. Hailey, C. Jin, D. Haggard, E. George, F. Eisenhauer, F. Harrison, G. Ponti, I. Waisberg, J. Dexter, K. Mori, K. Nandra, M. Clavel, M. Habibi, N. Degenaar, O. Pfuhl, P. M. Plewa, R. Genzel, R. Terrier, S. Gillessen, S. Scaringi, S. Zhang, T. Ott","submitted_at":"2017-03-09T19:00:01Z","abstract_excerpt":"We present the first fully simultaneous fits to the NIR and X-ray spectral slope (and its evolution) during a very bright flare from Sgr A*, the supermassive black hole at the Milky Way's center. Our study arises from ambitious multi-wavelength monitoring campaigns with XMM-Newton, NuSTAR and SINFONI. The average multi-wavelength spectrum is well reproduced by a broken power-law with $\\Gamma_{NIR}=1.7\\pm0.1$ and $\\Gamma_X=2.27\\pm0.12$. The difference in spectral slopes ($\\Delta\\Gamma=0.57\\pm0.09$) strongly supports synchrotron emission with a cooling break. The flare starts first in the NIR wi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.03410","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"}