dsph masses
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
dSph Masses
Matthew Walker – IoA, Cambridge
withMario Mateo - U. MichiganEdward Olszewski - U. ArizonaJorge Peñarrubia - IoAWyn Evans - IoAGerry Gilmore - IoA
--Stay tuned for Joe Wolf’s talk too--
Extreme Star Formation in Dwarf Galaxies
Ann Arbor, 28 July, 2009
Kinematics with the Jeans Equation
1) Jeans Eq. (spherical)
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3) Adopt Hernquist Halo Model
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Free Parameters V_max, r_scale, alpha, gamma, beta=constant
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2) Solution in terms of observables
Fornax: Vmax = 20 +/- 4 km/s
arXiv:0906.0341
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M(rhalf) for 8 “classical” dSphs
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arXiv:0906.0341
• Robust to large ranges for r0, alpha, gamma, beta
Simple Mass Estimator
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QuickTime™ and aTIFF (Uncompressed) decompressor
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Isotropy, flat vdisp profile -->
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Simple Mass Estimator
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Simple Mass Estimator
c.f. Strigari et al. 2008
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Data for 28 Satellites
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arXiv:0906.0341
A Universal Mass Profile?
arXiv:0906.0341
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Velocity Dispersion vs. Size
arXiv:0906.0341
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Universal Mass Profile?
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arXiv:0906.0341
Scatter wrt Universal Profile and M300
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arXiv:0906.0341
