NuSTAR and Suzaku Observations of the Hard State in Cygnus X-1: Locating the Inner Accretion Disk
作者： ML Parker , JA Tomsick , JM Miller , K Yamaoka , A Lohfink
DOI: 10.1088/0004-637X/808/1/9
关键词: Physics 、 Telescope 、 Accretion (astrophysics) 、 Accretion disc 、 Radius 、 Spectral line 、 Astronomy 、 Gravitation 、 Binary number 、 Broadband 、 Astrophysics
摘要: We present simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR ) and Suzaku observations of the X-ray binary Cygnus X-1 in hard state. This is first time this state has been observed Cyg with NuSTAR, which enables us to study reflection broadband spectra unprecedented detail. confirm that iron line cannot be fit a combination narrow lines absorption features, instead requiring relativistically blurred profile from companion wind. use models Garcia et al. simultaneously measure black hole spin, disk inner radius, coronal height self-consistent manner. Detailed fits indicate high level relativistic blurring, indicative accretion disk. find small low source rule out truncation greater than three gravitational radii at 3σ confidence level. In addition, we not changed greatly switch soft states, differences are consistent changes underlying spectrum rather blurring. blurring parameters when fitting either just or entire spectrum, well modeled Comptonized continuum plus model.
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