{"paper":{"title":"Discovery of $\\gamma$-ray emission from steep radio spectrum NLS1s","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Marco Berton, Min-Feng Gu, Neng-Hui Liao, Shan-Shan Weng, Yi-Zhong Fan, Yun-Feng Liang","submitted_at":"2015-10-19T16:55:50Z","abstract_excerpt":"Narrow line Seyfert 1 galaxies (NLS1s) usually do not host relativistic jets and the detection of their $\\gamma$-ray emissions is rarely reported. Evidences for strong relativistic beaming effect have been found in all $\\gamma$-ray NLS1s to date and hence their jets are believed to be closely aligned. In this work we perform a systematic analysis of 7-year {\\it Fermi} Large Area Telescope (LAT) data of 18 steep radio spectrum NLS1s (S-NLS1s) and report the {\\it first} two detections of $\\gamma$-ray emissions in this class, increasing the total number of known $\\gamma$-ray NLS1s to 9. A strong "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.05584","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"}