{"paper":{"title":"Study of the Long-Term X-Ray Variability of a Possible Quasar RX J0957.9+6903 with ASCA","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Kazuo Makishima, Naoko Iyomoto, Yu-ichiro Ezoe","submitted_at":"2000-10-16T05:22:38Z","abstract_excerpt":"Long-term variability and spectral properties of a possible quasar, RX J0957.9+6903, were studied, utilizing 16 ASCA observations spanning 5.5 years. The average 0.7--10 keV spectrum of RX J0957.9+6903 is well represented by a power-law continuum of photon index 1.58 $\\pm$ 0.03, and an absorption column of $\\sim$ 1$\\times{\\rm 10}^{21}$ ${\\rm cm}^{-2}$. The 2--10 keV flux of RX J0957.9+6903 varied by a factor of four over the period of six years, around a mean of $\\sim$ 8.8$\\times {\\rm 10}^{-12}$ erg ${\\rm s}^{-1}$ ${\\rm cm}^{-2}$. Peak to peak variability within each observation was less than "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0010291","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"}