dSph Masses Matthew Walker – IoA, Cambridge with Mario Mateo - U. Michigan Edward Olszewski - U. Arizona Jorge Peñarrubia - IoA Wyn Evans - IoA Gerry Gilmore - IoA --Stay tuned for Joe Wolf’s talk too-- Extreme Star Formation in Dwarf Galaxies Ann Arbor, 28 July, 2009

Velocity Dispersion Profiles Walker etal (arXiv: )

Kinematics with the Jeans Equation 1) Jeans Eq. (spherical) 3) Adopt Hernquist Halo Model --> NFW Cusp --> Core Free Parameters V_max, r_scale, alpha, gamma, beta=constant 2) Solution in terms of observables

Fornax: Vmax = 20 +/- 4 km/s arXiv:

M(rhalf) for 8 “classical” dSphs arXiv: Robust to large ranges for r0, alpha, gamma, beta

Simple Mass Estimator Jeans Eq. Isotropy, flat vdisp profile -->

Simple Mass Estimator

Simple Mass Estimator c.f. Strigari et al. 2008

Data for 28 Satellites arXiv:

A Universal Mass Profile? arXiv:

Velocity Dispersion vs. Size arXiv:

Universal Mass Profile? arXiv:

Scatter wrt Universal Profile and M 300 arXiv: