We report on a new study aimed at understanding the diversity and evolutionary properties of distant galactic bulges in the context of well-established trends for pure spheroidal galaxies .
Bulges have been isolated for a sample of 137 spiral galaxies in the GOODS fields within the redshift range 0.1 < z < 1.2 .
Using proven photometric techniques we determine for each galaxy the characteristic parameters ( size , surface brightness , profile shape ) in the 4 GOODS-ACS imaging bands of both the disk and bulge components .
Using the DEIMOS spectrograph on Keck , precision stellar velocity dispersions were secured for a sizeable fraction of the bulges .
This has enabled us to compare the Fundamental Plane of our distant bulges with that of field spheroidal galaxies in a similar redshift range .
Bulges in spiral galaxies with a bulge-to-total luminosity ratio ( B / T ) > 0.2 show very similar patterns of evolution to those seen for low luminosity spheroidals .
To first order , their recent mass assembly histories are equivalent .