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Advection-Dominated Accretion Model for Sagittarius A: Evidence for a $10^6\msun$ Black Hole at the Galactic Center
Ramesh Narayan, Insu Yi, Rohan Mahadevan
The enigmatic radio source Sagittarius A* at the centre of our Galaxy appears to be a low-luminosity version of active galactic nuclei in other galaxies. By analogy with active gal…
Advection-Dominated Accretion: Self-Similarity and Bipolar Outflows
Ramesh Narayan, Insu Yi
We consider axisymmetric viscous accretion flows where a fraction f of the viscously dissipated energy is advected with the accreting gas as stored entropy and a fraction 1-f is ra…
The lens parallax method: determining the redshifts of the faint blue galaxies through gravitational lensing
Ramesh Narayan, Matthias Bartelmann
We propose a new technique, which we call the lens parallax method, to determine simultaneously the redshift distribution of the faint blue galaxies and the mass distribution of fo…
Gravitational Lensing and the Mass Distribution of Clusters
Matthias Bartelmann, Ramesh Narayan
We review and discuss information on the mass distribution of galaxy clusters obtained from gravitational lensing.
Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
Ramesh Narayan, Insu Yi
We describe new optically thin solutions for rotating accretion flows around black holes and neutron stars. These solutions are advection dominated, so that most of the viscously d…
Advection-Dominated Accretion: A Self-Similar Solution
Ramesh Narayan, Insu Yi
We consider viscous rotating accretion flows in which most of the viscously dissipated energy is stored as entropy rather than being radiated. Such advection-dominated flows may oc…