{"paper":{"title":"UM 625 Revisited: Multiwavelength Study of A Seyfert 1 Galaxy with a Low-mass Black Hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Huan Yang, Junxian Wang, Luis C. Ho, Ning Jiang, Xiao-Bo Dong","submitted_at":"2013-04-21T22:19:43Z","abstract_excerpt":"UM 625, previously identified as a narrow-line active galactic nucleus (AGN), actually exhibits broad \\ha\\ and \\hb\\ lines whose width and luminosity indicate a low black hole mass of $1.6 \\times 10^6$ \\msun. We present a detailed multiwavelength study of the nuclear and host galaxy properties of UM 625. Analysis of \\chandra\\ and \\xmm\\ observations suggests that this system contains a heavily absorbed and intrinsically X-ray weak ($\\aox=-1.72$) nucleus. Although not strong enough to qualify as radio-loud, UM 625 does belong to a minority of low-mass AGNs detected in the radio. The broad-band sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.5807","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"}