{"paper":{"title":"Serendipitous discovery of a projected pair of QSOs separated by 4.5 arcsec on the sky","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"B. Venemans, C. Ledoux, F. G. Saturni, J.-K. Krogager, J. P. U. Fynbo, K. E. Heintz, M. Arabsalmani, M. Vestergaard, P. M{\\o}ller, P. Noterdaeme, S. Geier","submitted_at":"2016-04-05T18:53:00Z","abstract_excerpt":"We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of $\\Delta\\theta =4.50$ arcsec. The redshifts of the two QSOs are widely different: one, our programme target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 AGN at $z=2.05$. For this target we detect Lyman-$\\alpha$, \\ion{C}{4}, and \\ion{C}{3]}. The other QSO, which by chance was included on the spectroscopic slit, is a Type 1 QSO at a redshift of $z=1.68$, for which we detect \\ion{C}{4}, \\ion{C}{3]} and \\ion{Mg}{2}. We compare this system to previously "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.01361","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"}