{"paper":{"title":"The ROSAT Deep Surveys","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) ESO, (3) Caltech, (4) Max-Planck-Institut f. extrat. Physik, (5) Osservatorio Astronomico Bologna), G. Hasinger (1), G. Zamorani (5) ((1) Astrophysikalisches Institut Potsdam, I. Lehmann (2), J. Truemper (4), M. Schmidt (3), R. Giacconi (2)","submitted_at":"1999-01-09T17:36:19Z","abstract_excerpt":"The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, encompassing an exposure time of 200 ksec with the PSPC and 1.2 Msec with the HRI. The source counts reach a density of ~1000/deg2 at a limiting flux of ~1E-15 erg/cm2/s. At this level 70-80% of the 0.5-2 keV X-ray background is resolved into discrete sources. Because of the excellent HRI positions, 83 X-ray sources with fluxes (0.5-2 keV) above 1.2E-15 erg/cm2/s could be optically identified so far utilizing deep optical CCD images, NIR photometry and Keck spectroscopy. Only 11 sources above this f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9901103","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9901103/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}