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10 papers
Comparison of simple mass estimators for slowly rotating elliptical galaxies
N. Lyskova, J. Thomas, E. Churazov +2
We compare the performance of mass estimators for elliptical galaxies that rely on the directly observable surface brightness and velocity dispersion profiles, without invoking com…
Comparison of an approximately isothermal gravitational potentials of elliptical galaxies based on X-ray and optical data
E. Churazov, S. Tremaine, W. Forman +6
We analyze six X-ray bright elliptical galaxies, observed with Chandra and XMM-Newton, and approximate their gravitational potentials by isothermal spheres phi(r)=v_c^2 ln(r) over…
The M-sigma and M-L Relations in Galactic Bulges and Determinations of their Intrinsic Scatter
Kayhan Gultekin, Douglas O. Richstone, Karl Gebhardt +13
We derive improved versions of the relations between supermassive black hole mass (M_BH) and host-galaxy bulge velocity dispersion (sigma) and luminosity (L) (the M-sigma and M-L r…
Dynamical Origin of Extrasolar Planet Eccentricity Distribution
M. Juric, S. Tremaine
We explore the possibility that the observed eccentricity distribution of extrasolar planets arose through planet-planet interactions, after the initial stage of planet formation w…
Supermassive Black Holes and the Evolution of Galaxies
D. Richstone, E. A. Ajhar, R. Bender +11
Black holes, an extreme consequence of the mathematics of General Relativity, have long been suspected of being the prime movers of quasars, which emit more energy than any other o…
A map for eccentric orbits in triaxial potentials
J. Touma, S. Tremaine
We construct a simple symplectic map to study the dynamics of eccentric orbits in non-spherical potentials. The map offers a dramatic improvement in speed over traditional integrat…