Stéphane Courteau
Stéphane Courteau
Stéphane Courteau
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Ascona/Terschelling Highlights<br />
• New evidence that the disk of M31 goes out to > 50 kpc<br />
= 10 scale lengths (maybe to 150 kpc: Guhathakurta et<br />
al. 2005<br />
• Kinematics of red giants confirms that the outer disk is<br />
rotating almost as rapidly as the inner disk (Ibata et al<br />
2005) and has a velocity dispersion of ~ 30 km s -1 )<br />
• The CMD of M31 suggests that the outer disk is<br />
probably fairly old (several Gyr), as in M33 and the MW<br />
• Outer disk of M31, like the MW, is α-enhanced,<br />
with [α/Fe] = + 0.2 (also Eu-enhanced): indicates<br />
fairly rapid star formation history in the outer disk,<br />
unlike the solar neighborhood.
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