{"paper":{"title":"The Murmur of The Hidden Monster: Chandra's Decadal View of The Super-massive Black Hole in M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Christine Jones, Dharam V. Lal (CfA), Michael R. Garcia, Q. Daniel Wang (UMass), Ralph P. Kraft, Stephen S. Murray (CfA/JHU), William R. Forman, Zhiyuan Li","submitted_at":"2010-11-04T17:54:51Z","abstract_excerpt":"The Andromeda galaxy (M31) hosts a central super-massive black hole (SMBH), known as M31$^\\ast$, which is remarkable for its mass ($\\sim$$10^8{\\rm~M_\\odot}$) and extreme radiative quiescence. Over the past decade, the Chandra X-ray observatory has pointed to the center of M31 $\\sim$100 times and accumulated a total exposure of $\\sim$900 ks. Based on these observations, we present an X-ray study of a highly variable source that we associate with M31$^\\ast$ based on positional coincidence. We find that M31$^\\ast$ remained in a quiescent state from late 1999 to 2005, exhibiting an average 0.5-8 k"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.1224","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"}