The Evolution of Bulges in COSMOS Spirals

Details The Evolution of Bulges in COSMOS Spirals The Evolution of Bulges in COSMOS Spirals

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922503s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #225.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from an analysis of the B/D ratio in over 4000 L* spiral galaxies at z<0.8 from the Cosmic Evolution Survey (COSMOS). Preliminary analysis shows a monotonic increase by a factor of 2--3 in the median B/D ratio. But the change is predominantly seen in bluer (late Hubble type) galaxies. The decreasing star formation rate in disks may explain this trend. However, in galaxies between T-type 2 and 3, the B/D ratio does not evolve, suggesting that bulges in these spirals were already present by z˜0.8.

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