The Spin of the Black Hole GRS 1716-249 Determined from the Hard Intermediate State
The Spin of the Black Hole GRS 1716-249 Determined from the Hard Intermediate State
Abstract We present three simultaneous/quasi-simultaneous NuSTAR and Swift data sets of the black hole (BH) GRS 1716-249 in its hard intermediate state. The accretion disk in this state may have reached the innermost stable circular orbit, and the NuSTAR spectra show a broad relativistic iron line and a strong Compton …