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Query: journal id: "astrophysicalxjournal"

AuthorsJ.L. Blum, J.M. Miller, A.C. Fabian, M.C. Miller, J. Homan, M. van der Klis, E.M. Cackett, R.C. Reis
TitleMeasuring the spin of GRS 1915+105 with relativistic disk reflection
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractGRS 1915+105 harbors one of the most massive known stellar black holes in the Galaxy. In 2007 May, we observed GRS 1915+105 for similar to 117 ks in the low/hard state using Suzaku. We collected and analyzed the data with the Hard X-ray Detector/Positive Intrinsic Negative and X-ray Spectrometer cameras spanning the energy range from 2.3 to 55 keV. Fits to the spectra with simple models reveal strong disk reflection through an Fe K emission line and a Compton backscattering hump. We report constraints on the spin parameter of the black hole in GRS 1915+105 using relativistic disk reflection models. The model for the soft X-ray spectrum (i.e., < 10 keV) suggests <(a)over cap> = 0.56(-0.02)(+0.02) and excludes zero spin at the 4 sigma level of confidence. The model for the full broadband spectrum suggests that the spin may be higher, (a) over cap = 0.98(-0.01)(+0.01) (1 sigma confidence), and again excludes zero spin at the 2 sigma level of confidence. We discuss these results in the context of other spin constraints and inner disk studies in GRS 1915+105.
Document typeArticle
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