The miniJPAS survey: AGN & host galaxy co-evolution of X-ray selected sources

Abstract

Studies indicate strong evidence of a scaling relation in the local Universe between the supermassive black hole mass (M BH ) and the stellar mass of their host galaxies (M ). They even show similar histories across cosmic times of their differential terms: star formation rate (SFR) and black hole accretion rate (BHAR). However, a clear picture of this coevolution is far from being understood. We select an X-ray sample of active galactic nuclei (AGN) up to z = 2.5 in the miniJPAS footprint. Their X-ray to infrared spectral energy distributions (SEDs) have been modeled with the CIGALE code, constraining the emission to 68 bands, from which 54 are the narrow filters from the miniJPAS survey. For a final sample of 308 galaxies, we derive their physical properties, like their M , SFR, star formation history, and the luminosity produced by the accretion process of the central BH (L AGN ). For a subsample of 113 sources, we also fit their optical spectra to obtain the gas velocity dispersion from the broad emission lines and estimate the M BH . We calculate the BHAR in physical units depending on two radiative efficiency regimes. We find that the Eddington ratios and its popular proxy (L X /M ) have, on average, 0.6 dex of difference, and a KS-test indicates that they come from different distributions. Our sources exhibit a considerable scatter on the M BH -M scaling relation, and this can explain the difference between the Eddington ratios and its proxy. We also model three evolution scenarios for each source to recover the integral properties at z = 0. Using the SFR and BHAR, we show a notable diminution in the scattering between M BH -M . For the last scenario, we consider the SFH and a simple energy budget for the AGN accretion, and we retrieve a relation similar to the calibrations known for the local Universe. Our study covers ∼ 1 deg 2 in the sky and is sensitive to biases in luminosity. Nevertheless, we show that, for bright sources, the link between the differential values (SFR and BHAR) and their decoupling based on an energy limit is the key that leads to the local M BH -M scaling relation. In the future, we plan to extend this methodology to thousand degrees of the sky using JPAS with an X-ray selection from eROSITA, to obtain an unbiased distribution of BHAR and Eddington ratios.