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We studied the chronology of galactic bulge and disc formation by analysingthe relative contributions of these components to the B-band rest-frameluminosity density at different epochs. We present the first estimate of theevolution of the fraction of rest-frame B-band light in galactic bulges anddiscs since redshift z~0.8. We performed a bulge-to-disc decomposition ofHST/ACS images of 3266 galaxies in the zCOSMOS-bright survey with spectroscopicredshifts in the range 0.7 < z < 0.9. We find that the fraction of B-band lightin bulges and discs is $(26 \pm 4)%$ and $(74 \pm 4)%$, respectively. Whencompared with rest-frame B-band measurements of galaxies in the local Universein the same mass range ($10^{9} M_{\odot}\lessapprox M \lessapprox 10^{11.5}M_{\odot}$), we find that the B-band light in discs decreases by ~30% fromz~0.7-0.9 to z~0, while the light from the bulge increases by ~30% over thesame period of time. We interpret this evolution as the consequence of starformation and mass assembly processes, as well as morphological transformation,which gradually shift stars formed at half the age of the Universe fromstar-forming late-type/irregular galaxies toearlier types and ultimately intospheroids.

The zCOSMOS Redshift Survey: evolution of the light in bulges and discs since z~0.8