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dSph Masses

dSph Masses

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dSph Masses

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  1. 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

  2. Velocity Dispersion Profiles Walker etal (arXiv:0906.0341)

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

  4. Fornax: Vmax = 20 +/- 4 km/s arXiv:0906.0341

  5. M(rhalf) for 8 “classical” dSphs • Robust to large ranges for r0, alpha, gamma, beta arXiv:0906.0341

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

  7. Simple Mass Estimator

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

  9. Data for 28 Satellites arXiv:0906.0341

  10. A Universal Mass Profile? arXiv:0906.0341

  11. Velocity Dispersion vs. Size arXiv:0906.0341

  12. Universal Mass Profile? arXiv:0906.0341

  13. Scatter wrt Universal Profile and M300 arXiv:0906.0341