Accurate masses for dispersion-supported galaxies
Joe WolfCenter for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USAGregory D. MartinezCenter for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USAJames S. BullockCenter for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USAManoj KaplinghatCenter for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USAMarla GehaAstronomy Department, Yale University, New Haven, CT 06520, USARicardo R. MuñozAstronomy Department, Yale University, New Haven, CT 06520, USAJoshua D. SimonObservatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USAFrank F. AvedoCenter for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
2010en
ABI
Аннотация
We derive an accurate mass estimator for dispersion-supported stellar systems and demonstrate its validity by analysing resolved line-of-sight velocity data for globular clusters, dwarf galaxies and elliptical galaxies. Specifically, by manipulating the spherical Jeans equation we show that the mass enclosed within the 3D deprojected half-light radius r 1/2 can be determined with only mild assumptions about the spatial variation of the stellar velocity dispersion anisotropy as long as the projected velocity dispersion profile is fairly flat near the half-light radius, as is typically observed. We find
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