Measuring the Spin of GRS 1915 105 with Relativistic Disk Reflection - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: GRS 1915+105 harbors one of the most massive known stellar black holes in theGalaxy. In May 2007, we observed GRS 1915+105 for 117 ksec in the low-hardstate using Suzaku. We collected and analyzed the data with the HXD-PIN and XIScameras spanning the energy range from 2.3-55 keV. Fits to the spectra withsimple models reveal strong disk reflection through an Fe K emission line and aCompton back-scattering hump. We report constraints on the spin parameter ofthe black hole in GRS 1915+105 using relativistic disk reflection models. Themodel for the soft X-ray spectrum i.e. < 10 keV suggests a-M = 0.562 andexcludes zero spin at the 4 sigma level of confidence. The model for the fullbroadband spectrum suggests that the spin may be higher, a-M = 0.981 1 sigmaconfidence, and again excludes zero spin at the 2 sigma level of confidence.We discuss these results in the context of other spin constraints and innerdisk studies in GRS 1915+105.



Author: J. L. Blum 1, J. M. Miller 1, A. C. Fabian 2, M. C. Miller 3, J. Homan 4, M. van der Klis 5, E. M. Cackett 1, R. C. Reis 2 1 Univ

Source: https://arxiv.org/







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