Comparison of star formation histories of AGN and non-AGN galaxies

We used active galactic nuclei (AGNs) with X-ray luminosities, LX, 2 − 10 keV ∼ 1042.5 − 44 erg s−1, from the COSMOS-Legacy survey that lie within the UltraVISTA region and cross-matched them with the LEGA-C catalogue. The latter provides measurements of the calcium break, Dn4000, and Hδ Balmer line that allow us to study the stellar populations of AGNs and compare them with a galaxy reference catalogue. Our samples consist of 69 AGNs and 2176 non-AGN systems, within 0.6
G.M. acknowledges support by the Agencia Estatal de Investigación, Unidad de Excelencia María de Maeztu, ref. MDM-2017-0765. The project has received funding from Excellence Initiative of Aix-Marseille University – AMIDEX, a French ‘Investissements d’Avenir’ programme. This work was partially funded by the ANID BASAL project FB210003. M.B. acknowledges support from FONDECYT regular grant 1211000. Q.N. acknowledges support from a UKRI Future Leaders Fellowship (grant code: MR/T020989/1).