Stéphane Courteau

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Ascona/Terschelling Highlights • Heroic star counts in M31 (Ferguson/Chapman/Guhathakurta/Worthey) – Very extended structure (disk>50 kpc; halo to 150 kpc?) – Disk or metal-poor halo? – kinematics, [Fe/H] • UV & Hα evidence for faint outer disks (Bland-Hawthorne, Zaritsky) • Origin of these components? – Star formation threshold? – Is there a link with presence of HI warp or flare?
The outer regions of M31 Worthey, Espana, MacArthur & <strong>Courteau</strong> 2005 HST photometry in the outermost regions of M31 yields stellar metallicity distribution The metallicity gradient bottoms out at R=15kpc, at [Fe/H] = -0.5 The high [Fe/H] in the outer parts of M31 suggests that most of the stars in the outer “halo” might be stars of the outer disk.
Page 1 and 2: Nearly Normal Galaxies in a ΛCDM U
Page 3: Ascona/Terschelling Highlights •
Page 7 and 8: Ascona/Terschelling Highlights •
Page 9 and 10: Ascona/Terschelling Highlights •
Page 11 and 12: NGC 4656: small bulge and prominent
Page 13 and 14: Ascona/Terschelling Highlights Disk
Page 15 and 16: Interpretations of disk truncations
Page 17 and 18: 0.15 µm 0.4-0.8 µm 1.2-2.2 µm 3.
Page 19 and 20: ΛCDM Formation Models • Failures
Page 21 and 22: ΛCDM Formation Models • predicti
Page 23 and 24: Effect of Adiabatic Contraction (sa
Page 25 and 26: Moving Forward in Mass Modeling Req
Page 29 and 30: An argument for pure stellar disks
Page 31 and 32: Residual Correlations Courteau et a
Page 33 and 34: Comparison With Models • Simple e
Page 36 and 37: Evidence for Sub-Maximal Disks •
Page 38 and 39: SparsePak Study of Barred Galaxies
Page 40 and 41: € Scaling Relations of Galaxies
Page 42 and 43: λ = halo spin c = halo conc. m d =

Stéphane Courteau

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