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We present a multi-component structural analysis of the internal structure of$1074$ high redshift massive galaxies at $1<z<3$ from the CANDELS HST Survey.In particular we examine galaxies best-fit by two structural components, andthus likely forming discs and bulges. We examine the stellar mass, starformation rates, and colours of both the inner `bulge' and outer `disc'components for these systems using SED information from the resolved ACS+WFC3HST imaging. We find that the majority of both inner and outer components liein the star-forming region of UVJ space ($68$ and $90$ per cent respectively).However, the inner portions, or the likely forming bulges, are dominated bydusty star formation. Furthermore, we show that the outer components of thesesystems have a higher star formation rate than their inner regions, and theratio of star formation rate between `disc' and `bulge' increases at lowerredshifts. Despite the higher star formation rate of the outer component, thestellar mass ratio of inner to outer component remains constant through thisepoch. This suggests that there is mass transfer from the outer to innercomponents for typical two component forming systems, thus building bulges fromdisks. Finally, using Chandra data we find that the presence of an AGN is morecommon in both $1$-component spheroid-like galaxies and $2$-component systems($13\pm3$ and $11\pm2$ per cent) than in $1$-component disc-like galaxies($3\pm1$ per cent), demonstrating that the formation of a centralinner-component likely triggers the formation of central massive black holes inthese galaxies.

Stellar populations, stellar masses and the formation of galaxy bulges and discs at $z < 3$ in CANDELS