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Observational Evidence for Black Holes
Ramesh Narayan, Jeffrey E. McClintock
Astronomers have discovered two populations of black holes: (i) stellar-mass black holes with masses in the range 5 to 30 solar masses, millions of which are present in each galaxy…
A High-Frequency Doppler Feature in the Power Spectra of Simulated GRMHD Black Hole Accretion Disks
Sarah Wellons, Yucong Zhu, Dimitrios Psaltis +2
Black hole binaries exhibit a wide range of variability phenomena, from large-scale state changes to broadband noise and quasi-periodic oscillations, but the physical nature of muc…
Confirmation Via the Continuum-Fitting Method that the Spin of the Black Hole in Cygnus X-1 is Extreme
Lijun Gou, Jeffrey E. McClintock, Ronald A. Remillard +6
In Gou et al. (2011), we reported that the black hole primary in the X-ray binary Cygnus X-1 is a near-extreme Kerr black hole with a spin parameter a*>0.95(3σ). We confirm this re…
Energy Extraction from Spinning Black Holes via Relativistic Jets
Ramesh Narayan, Jeffrey E. McClintock, Alexander Tchekhovskoy
It has for long been an article of faith among astrophysicists that black hole spin energy is responsible for powering the relativistic jets seen in accreting black holes. Two rece…