The connection between star-formation and supermassive Black Hole accretion in the local Universe
Olena Torbaniuk (Università degli Studi di Napoli Federico II)
Tuesday 14/12/2021 @ 14:00, Sala IV piano Battiferro
A connection between supermassive Black Holes (SMBH) and galaxy growth has been suggested by a number of studies, based on empirical correlations between BH mass and integrated galaxy properties as galaxy bulge mass, total stellar mass, velocity dispersion and star formation rate (SFR). In particular current studies show that SFR and AGN activity appear to follow similar patterns with cosmic time (i.e. redshift), indicating that the evolution of galaxies and their central SMBH proceeds in a coherent way. So far most studies have explored intermediate/high redshift ranges, mainly due to the lack of large, homogeneous X-ray surveys at low redshift. In our work we present the study of the AGN activity as a function of stellar mass and star-formation rate in local Universe. Using a parent sample of galaxies from the SDSS DR8 with spectroscopic SFR estimates, and applying standard AGN selection criteria we derived the fraction of efficiently-accreting AGNs and investigated the properties of their host galaxies (star-formation, mass). Based on X-ray detections from the 3XMM DR8 we evaluated the specific Black Hole accretion rate (sBHAR) for studied objects and infer the intrinsic sBHAR distribution in the local Universe.