Image of Alice in Wonderland at the Mad Hatter's tea party You are cordially invited to afternoon tea and biscuits wine and chocolate

Astronomy Tea Talks at Caltech

Mondays, Hameetman auditorium (Cahill)
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2011 - 2012 season:
6 February 2012 Susan Kassin (Goddard)

The Epoch of Disk Settling: z~1 to Today

With measurements of galaxy kinematics and morphologies for ~550 blue galaxies from the DEEP2 Survey over 0.1< z < 1.2, we show how blue galaxies have evolved to become the rotation-dominated disks common in the local Universe. At a redshift of ~1, Milky-Way mass blue galaxies were on average different beasts than today. They had a significant amount of disturbed motions and disturbed morphologies. Since a redshift of ~1, they have decreased in disturbed motions and increased in rotation velocity, while becoming more morphologically ordered. In addition, we find that galaxy kinematics are correlated with morphology such that galaxis with the smallest rotation velocities and the most amounts of disturbed motions have the most disturbed morphologies. Furthermore, we find that the rates at which galaxies become more kinematically ordered (i.e., large rotation velocity, small amount of disturbed motions) and morphologically ordered (i.e., normal disk morphology) are directly proportional to their stellar masses.
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Image of the Mad Hatter from Alice in Wonderland
Last modified on 01st Feb 2012 by Marco Viero.  

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