{"paper":{"title":"Searching for the 3.5 keV Line in the Deep Fields with Chandra: the 10 Ms observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"Adam Foster, Eric Miller, Esra Bulbul, Francesca Civano, Mark W. Bautz, Megan C. Urry, Nico Cappelluti, Priyamvada Natarajan, Randall K. Smith","submitted_at":"2017-01-27T03:31:54Z","abstract_excerpt":"In this paper we report a systematic search for an emission line around 3.5 keV in the spectrum of the Cosmic X-ray Background using a total of $\\sim$10 Ms Chandra observations towards the COSMOS Legacy and CDFS survey fields. We find a marginal evidence of a feature at an energy of $\\sim$3.51 keV with a significance of 2.5-3 $\\sigma$, depending on the choice of the statistical treatment. The line intensity is best fit at $8.8\\ \\pm\\ {2.9}\\times10^{-7}$ ph cm$^{-2}$s$^{-1}$ when using a simple $\\Delta\\chi^2$ or $10.2\\ ^{+0.2}_{-0.4} \\times10^{-7}$ ph cm$^{-2}$s$^{-1}$ when MCMC is used. Based o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.07932","kind":"arxiv","version":3},"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"}