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Extreme Star Formation in Dwarf Galaxies: Velocity Dispersion Profiles and Simple Mass Estimation

Explore velocity dispersion profiles and simple mass estimation methods in extreme star-forming dwarf galaxies. Join Matthew Walker, Mario Mateo, Edward Olszewski, Jorge Peñarrubia, Wyn Evans, and Gerry Gilmore from various prestigious institutions for insights into cutting-edge research. Stay informed for Joe Wolf's upcoming talk. This discussion, held in Ann Arbor on July 28, 2009, delves into the Jeans Equation and its spherical solution in terms of observables. Discover the Hernquist Halo Model and its free parameters, impacting core and NFW cusp structures in Fornax and beyond. Uncover robust mass estimation techniques applicable to classical dSph galaxies and investigate the universal mass profile hypothesis. This session also examines the relationship between velocity dispersion and size, along with scatter concerning universal profiles and M300. Join us for a deep dive into dwarf galaxy dynamics and mass estimation methodologies.

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Extreme Star Formation in Dwarf Galaxies: Velocity Dispersion Profiles and Simple Mass Estimation

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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

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