Contributed Talk - Splinter SMBHs
Wednesday, 23 September 2020, 15:10 (virtual room K)
The co-evolution of star-forming galaxies and their supermassive black holes across cosmic time
We probe the relation between the star formation rate (SFR) and black hole acretion rate (BHAR) for star-forming galaxies across cosmic time from z = 0.4−6, using the HiZELS and SC4K surveys to select a large sample of line-emitting star-forming galaxies (∼ 700 Ha emitters - HAEs - at z=0.4−2 for HiZELS and ∼ 4000 Lyman-a emitters - LAEs - at z=2−6 for SC4K). We use stacking and SED fitting techniques, as well as direct source extraction on the publicly available data in the X-rays, radio and FIR bands for the COSMOS field, and estimate the BHARs and SFRs of star-forming galaxies. We find no correlations between the radio emission and Lya but discover that the X-ray BHAR of star forming galaxies follows the evolution of SFR up to at least z = 3, with practically no delay between the two. We also conclude that LAEs are comprised of different populations: an AGN population, where Lya becomes an accretion indicator, and a star-forming population that is detected in the radio but remains unseen in the X-rays.