Model-independent estimates of dark matter distributions

• Autores: Xiao Wang, Matthew Walker, Jayanta Kumar Pal, Michael Woodroofe, Mario Mateo
• Localización: Journal of the American Statistical Association, ISSN 0162-1459, Vol. 103, Nº 483, 2008
• Idioma: inglés
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• Resumen

  • A new nonparametric method is described to estimate the distribution of mass within spherical galaxies. The problem of estimating the mass, M (r), within radius r is converted into a problem of estimating a regression function nonparametrically, subject to shape restrictions. We represent the restrictions by the interception of quadratic cones and use the second-order cone programming to estimate the unknown parameters. We establish asymptotic results that are used to construct confidence intervals on M (r). We apply the technique to new kinematic data for four dwarf galaxies. Results indicate that dark matter dominates the stellar kinematics of these systems at all radii. [PUBLICATION ABSTRACT]