Stéphane Courteau
Stéphane Courteau
Stéphane Courteau
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Ascona/Terschelling Highlights<br />
• Most disk galaxies have additional, thick, disk<br />
(Yoachim/Dalcanton)<br />
– Modest mass fraction,<br />
but increases below<br />
v c~120 km s -1<br />
– Some counter-rotate:<br />
⇒ external origin<br />
– Heavier counter-rotating<br />
disks seen in S0s<br />
(Kannappan)<br />
• [α/Fe] vs [Fe/H] in MW thick disk ⇒ it cannot have<br />
formed by accretion of small stellar lumps (Venn)<br />
• Origin in gas-rich merger (Sommer-Larsen)
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