Speaker
Description
Measuring the physical properties of AGN and their host galaxies is key to understand their parallel evolution, particularly the correlation between the stellar mass and black hole mass.
Spectral energy distribution (SED) fitting is a powerful tool for extracting the physical properties of galaxies. However, hosting a bright AGN can dilute the host galaxy’s emission, biasing measurements by notably overestimating the host galaxy’s stellar mass.
Euclid’s unique photometric capabilities provide near-infrared photometry for an unprecedentedly large sample of AGN candidates, crucial for constraining AGN and host galaxy contributions and thus improving our physical parameter measurements.
I will present the AGN and host galaxy physical parameter catalogue for the Euclid Q1 deep fields: EDFN, EDFS, and EDFF. The novelty of my approach is the estimation of the reliability of the SED fitting measurements, resulting in a more robust catalogue for the users.
From the SED fitting outputs, I identify true AGN and compared this new selection with previous NIR (Bisigello+24) and MIR (Assef+19) color-color approaches. From the physical property differences, I demonstrate that these selection methods probe different AGN populations, and their combination provides a more comprehensive picture of AGN.
This work will be extended to the larger Euclid DR1 sample, offering a unique opportunity to investigate the AGN and host galaxy co-evolution by reliably determining their physical properties.
