{"paper":{"title":"The 500 ks Chandra observation of the z = 6.31 QSO SDSS J1030+0524","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Comastri, B. Balmaverde, C. Norman, C. Vignali, E. Liuzzo, E. Sani, E. Vanzella, F. Calura, F. Vito, G. B. Caminha, G. Lanzuisi, G. Risaliti, G. Zamorani, I. Prandoni, K. Iwasawa, M. Brusa, M. Cappi, M. Chiaberge, M. Mignoli, M. Paolillo, N. Cappelluti, P. Rosati, P. Tozzi, R. Gilli, R. Nanni, T. Costa","submitted_at":"2018-02-15T15:21:44Z","abstract_excerpt":"We present the results from a $\\sim500$ ks Chandra observation of the $z=6.31$ QSO SDSS J1030+0524. This is the deepest X-ray observation to date of a $z\\sim6$ QSO. The QSO is detected with a total of 125 net counts in the full ($0.5-7$ keV) band and its spectrum can be modeled by a single power-law model with photon index of $\\Gamma = 1.81 \\pm 0.18$ and full band flux of $f=3.95\\times 10^{-15}$ erg s$^{-1}$ cm$^{-2}$. When compared with the data obtained by XMM-Newton in 2003, our Chandra observation in 2017 shows a harder ($\\Delta \\Gamma \\approx -0.6$) spectrum and a 2.5 times fainter flux. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.05613","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"}