{"paper":{"title":"X-ray Polarization from Black Holes: GEMS Scientific White Paper","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alice Harding (NASA/GSFC), Craig Markwardt (NASA/GSFC), Dong Lai (Cornell), Finland), Henric Krawczynski (Washington U.), Herman Marshall (MIT), India), Japan), Jean Swank (NASA/GSFC), Jeffrey Martoff (Temple), Jeffrey Scargle (NASA/ARC), Jeremy Schnittman (NASA/GSFC), Jessie Dotson (NASA/ARC), Joanne Hill (NASA/GSFC), Julian Krolik (JHU), Juri Poutanen (U. Oula, Keith Jahoda (NASA/GSFC), Kevin Black (NASA/GSFC), Lorella Angelini (NASA/GSFC), Matthew Baring (Rice), Peter Serlemitsos (NASA/GSFC), Phillip Kaaret (U. Iowa), Pranab Ghosh (TIFR, Robert Petre (NASA/GSFC), Robin Morris (NASA/ARC), Stephen Reynolds (NCSU), Takashi Okajima (NASA/GSFC), Tim Kallman (NASA/GSFC), Tod Strohmayer (NASA/GSFC), Toru Tamagawa (Riken U., Wayne Baumgartner (NASA/GSFC), Yang Soong (NASA/GSFC), Yuzuru Tawara (Nagoya U.","submitted_at":"2013-01-09T19:47:22Z","abstract_excerpt":"We present here a summary of the scientific goals behind the Gravity and Extreme Magnetism SMEX (GEMS) X-ray polarimetry mission's black hole (BH) observing program. The primary targets can be divided into two classes: stellar-mass galactic BHs in accreting binaries, and super-massive BHs in the centers of active galactic nuclei (AGN). The stellar-mass BHs can in turn be divided into various X-ray spectral states: thermal-dominant (disk), hard (radio jet), and steep power-law (hot corona). These different spectral states are thought to be generated by different accretion geometries and emissio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.1957","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"}