The bell laboratories H I survey
- A. Stark, A. Stark, M. Hurwitz
- Physics, Geology
- 1 March 1992
We present a galactic survey which to date consists of 73,000 positions covering −5° < l < 122°, −1° < b < 1° , observed in the J=1 → 0 line of 13CO to an rms noise level of 0.15 K in 0.68 km s−1…
Nonlinear Outcome of Gravitational Instability in Cooling, Gaseous Disks
- C. Gammie
- Physics
- 28 January 2001
Thin, Keplerian accretion disks generically become gravitationally unstable at large radii. I investigate the nonlinear outcome of such instability in cool disks using razor-thin, local, numerical…
Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
- E. Ostriker, J. Stone, C. Gammie
- Physics
- 29 August 2000
We use three-dimensional (3D) numerical magnetohydrodynamic simulations to follow the evolution of cold, turbulent, gaseous systems with parameters chosen to represent conditions in giant molecular…
HARM: A Numerical Scheme for General Relativistic Magnetohydrodynamics
- C. Gammie, J. McKinney, G. T'oth
- Physics
- 25 January 2003
We describe a conservative, shock-capturing scheme for evolving the equations of general relativistic magnetohydrodynamics. The fluxes are calculated using the Harten, Lax, & van Leer scheme. A…
Black Hole Spin Evolution
- C. Gammie, S. Shapiro, J. McKinney
- Physics
- 30 October 2003
We consider a subset of the physical processes that determine the spin j ≡ a/M of astrophysical black holes. These include (1) Initial conditions. Recent models suggest that the collapse of a…
First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
- K. Akiyama, A. Alberdi, L. Ziurys
- PhysicsAstrophysical Journal
- 10 April 2019
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study…
A gas cloud on its way towards the supermassive black hole at the Galactic Centre
- S. Gillessen, R. Genzel, T. Ott
- PhysicsNature
- 14 December 2011
The presence of a dense gas cloud approximately three times the mass of Earth that is falling into the accretion zone of Sagittarius A*, a compact radio source at the Galactic Centre, is reported.
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